Institute for the Physics and Mathematics of the Universe (IPMU)
The University of Tokyo
5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8568, Japan
Tel: +81-4-7136-4940 Fax: +81-4-7136-4941
http://www.ipmu.jp/

History of IPMU
2007 Dec

Focus Week: LHC Phenomenology

2008 Jan

Hirosi Ooguri Wins Inaugural Leonard Eisenbud Prize2008 MarIPMU Opening Symposium and Reception
Focus Week: Neutrino Mass
Masahiro Takada Wins ASJ Young Astronomer Award
Humboldt Research Award to Hirosi Ooguri
External Advisory Board Meeting
Asian Mathematicians and Theoretical Physicists Conference2008 Apr

Site Visit by JSPS and MEXT

2008 MayFirst WPI Follow-up Meeting
Moonshiney Conference2008 Jun

Focus Week: Second Workshop on LHC Phenomenology

2008 Jul

Public Lecture for Kashiwa Citizens at Kashiwa Campus

2008 AugIUPAP Young Scientist Prize to Naoki Yoshida and Eiichiro Komatsu

2008 Sep

Focus Week: Quantum Black HoleWorkshop on Micro-local Analysis of Symplectic Manifolds
Kamioka Satellite Office Opens

2008 OctOne Year Anniversary of IPMU: Press Conference and Reception
Yukawa-Kimura Prize to Shigeki Sugimoto2008 Nov

Focus Week: Messengers of Supernova Explosions
External Advisory Board Meeting2008 Dec

Site Visit by JSPS and MEXT
Inoue Science Prize to Masayuki Nakahata
JSPS Prize to Kunio Inoue2009 JanConstruction of New IPMU Building Began
Public Lecture at Yayoi Hall of Hongo Campus

2009 Feb"Science Cafe - Universe" (5 public lectures in 5 weeks during February and March)
at Tama Rokuto Science Museum2009 Mar

Focus Week: Determination of Masses and Spins of New Particles at the LHC

Copyright © IPMU Annual Report 2008
All rights reserved
Editorial board members
K. Abe (chair), M. Nakahata, K. Nomoto, K. Saito, T. Yanagida
Institute for the Physics and Mathematics of the Universe
The University of Tokyo
5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8568, Japan
Tel: +81-4-7136-4940 Fax: +81-4-7136-4941
http://www.ipmu.jp/
Print: KOHMURA Inc.

3

Launch of IPMU under WPI Program of MEXT

IPMU ANNUAL REPORT 20082007 OctHistory of IPMU

(October 2007 - March 2009)1. Mission
The Institute for the Physics and Mathematics of the Universe (IPMU) was launched in
October 2007, as one of the World Premier International Research Center Initiative (WPI) of
the Ministry of Education, Culture, Sports, Science and Technology (MEXT). This new research
institute will integrate the traditionally separate disciplines, mathematics, statistics, theoreticaland experimental physics, and astronomy, with a new organizational structure to address deep
mysteries of the universe.
What is the universe made of?
How did it begin?

The aim of IPMU is to address these rather simple questions human beings had pondered
for millennia using the power of forefront science. For example, we have learned amazing facts
about the universe in the last ten years. Much of the component of the universe is not madeof the kind of matter we know well, namely atoms, but rather of substances called dark matterand dark energy. Their true identity, called “dark” because they don’t emit light and therefore
we can’t see directly, is totally unknown at this moment. To address such deep mysteries weneed to create new data, to develop new statistical methods to analyze them, to build new
physical theories to understand them, and create new mathematics to formulate them.
The IPMU scientists will advance their research by exploiting the giant Subaru telescopebuilt by Japan to “observe” the dark sector of the universe, and the Large Hadron Collider (LHC)that smashes protons at extremely high energies to mimic the condition of the Big Bang. They
will also fully utilize the Super-Kamiokande experiment to better understand neutrinos and the
puzzle of vanished anti-matter in the universe, and initiate new experiments, for example, toreveal the identity of the dark matter. In addition to this multifaceted experimental approach tothe mysteries of the universe, we will pursue new theories of the universe by close collaborationof theoretical physics and advanced mathematics.

■ Figure 1: Hitoshi Murayama, IPMU Director

5

Why do we exist at all?

IPMU ANNUAL REPORT 2008

What fundamental laws govern it?

MissionWhat is its fate?

This report covers the progress of IPMU during the period of October 2007 and March2009 corresponding to a latter half of JFY 2007 and a whole of JFY 2008. The IPMU, startingfrom zero at the time of its launch in October 2007, now has 125 scientific staff, including
joint appointments and long term visitors, and 33 administrative staff, including 22 researchsupport staff. Mandate imposed by the WPI to establish an institute which is "visible worldwide"
is comfortably fulfilled by the fact that 54% of the 46 full-time scientific staff are non-Japanese.
Moreover, 48% of the 33 administrative staff are bilingual.
IPMU had active one and half year. We hosted 11 international conferences and 180
seminars. Among the 540 visitors, 168 came from abroad. A total of 178 papers have been
written, and 70 were published in refereed journals. IPMU scientists received several honors
and awards. H. Ooguri received the inaugural Eisenbud Prize and the 2009 Humboldt ResearchAward. S. Sugimoto received the 2008 Yukawa-Kimura Prize. The 2008 IUPAP Young Scientist
Prize was awarded to N. Yoshida in computational physics, and to E. Komatsu (U Texas, joint
appointment with IPMU) in astrophysics. M. Nakahata received the 2008 Inoue Prize, and K.
Inoue received the 2008 JSPS Prize. IPMU has been engaged in aggressive communications
with scientific community, with funding agencies, and with general public.

Introduction

2. Introduction

NumberForeign

FemalePrincipal Investigators

20

3

1

Faculty (not including 4 PIs)

15

3

0

Postdoctoral Fellows

21

17

3

Contents

Joint Appointments

49

19

1

Long-term Visitors

14

13

1

1

Students

6

5

0

Total

125

60

6

2

Introduction........................................ 7

3

Organization..................................... 94

Staff................................................ 11700

5Research Program............................ 13600

6Research Highlight............................ 31

500

7Seminars......................................... 41

400

8

Conferences..................................... 47

300

Conference Talks.............................. 49200

10 Visitors............................................ 53100

11 Publications..................................... 59

0

9

12 Preprints.......................................... 63
13 Outreach and Public Communications...... 73

Visitor x Day vs Month
687

394

350

319

310

272
208

1

0

10

11
2007

57

1

2

91

49

17
12

227

149

117

81

197

3

4

5

6

7

8

9

10

11

12

2008

■ Figure 2: Number of visitor times day per month

1

2
2009

3

IPMU ANNUAL REPORT 2008

Mission............................................. 57■ Table 1: Number of IPMU Reseach staff

JFY2007
Conferences

47

Seminars

24

156

Visitors (foreign)

168 (65)372 (103)

Preprints

30

148

Publications

2

68

The construction of anxiously waited new laboratory building began in January 2009
on the ground of Kashiwa campus. An expected completion date is October 2009. For the
past one and half years, we have been forced to work in offices at Kashiwa campus that are
scattered around in the General Research Building and several temporary buildings behind
it. The new laboratory building was designed with a strong emphasis on active interactions
among the researchers. We look forward to establishing a center where on-site researchersand visitors, physicists and mathematicians, gather and engage in active discussion. The
construction of new Kamioka Satellite Office was completed in February 2009. Located near
the Kamioka Observatory of ICRR, it provides support for IPMU’s experimental activities that are
conducted at Kamioka.

8

Introduction

JFY2008

The IPMU Director is appointed by the President of the University of Tokyo and reports
directly to the President. The Director has a complete authority of making a wide range ofdecisions including proposing recruitment of the Principal Investigators to the President, andappointing other research staff and administrative staff. The Director is assisted by two Deputy
Directors and Administrative Director. They hold the Executive Board Meeting (EBM) regularly
to ensure smooth operation of the Institute. The EBM has direct access to the Office of the
President for consultations on both scientific and administrative matters.
The Scientific advisory Committee (SAC) gives advice to the Director on hiring scientificstaff and setting scientific strategies. As of August 2008, the members consist of two Deputy
Directors and five among IPMU’s twenty Principal Investigators (T. Kohno, H. Ooguri, K. Saito, D.
Spergel, T. Yanagida), all appointed by the Director.
The External Advisory Board (EAB), appointed by the University President, reviews
annually the scientific achievement and activities of the Institute and advises the President on
scientific priorities and the research activities to keep the Institute stay on the course of theirobjectives.
IPMU has rather unique approach in organizing the research objectives, where theworld’s leading scientists in their research fields are appointed as the Principal Investigators.
There are twenty of them at the moment and they are affiliated to IPMU and other departmentsin the Host Institution (U of Tokyo) as well as other institutions. The Principal Investigators
have a large autonomy in the research they conduct. They can make proposals to the Director
to hire research staff at IPMU to help their research. The Director’s approval on the proposed
appointments will reflect the scientific vision and priorities set by the Director, who may consult
the SAC as needed.

9■ Table 2: Research Activities at IPMU in JFY2007 and JFY2008

Organization

3. Organization

U Tokyo President
IPMU Management
Center Director■ Figure 3: Aerial view of the Kashiwa campus.

■ Figure 4: IPMU temporary buildings.

External Advisory
Board

Administrative
Director

Deputy Directors

Scientific Advisory
Committee

Executive Board Meeting

IPMU Research
Principal Investigators
Visitors

Collaborators■ Figure 5: The Kamioka Satellite Office building.

■ Figure 6: New laboratory under construction.

■ Figure 7: IPMU’s research activities are conducted with a flat organization comprising of principal
investigators as a core, IPMU staff including junior researchers, collaborators, and visitors.

IPMU ANNUAL REPORT 2008

IPMU ANNUAL REPORT 2008

Faculty, Postdocs, Students

4. Staff
M. Gonokami

U of Tokyo

N. Kaifu

NAOJ

Y.K. Kim

Fermilab/U of Chicago

S. Kojima

TitechD. Morrison

UC Santa Barbara

R. Peccei

UCLA; Chair

N. Reshetikhin

UC Berkeley/U of Amsterdam

The administrative staff is an integral part of the Institute. Providing the best possible
environment to the researchers in the Institute is essentially important for the IPMU’s mission.
This part is headed by the Administrative Director. Its function also enables the Director to spend
more time to consider the Institute at large and focus on the direction of the research.

Deputy Directors
H. Aihara, Particle Physics
Y. Suzuki, Observational Particle Physics
Principal Investigators
H. Murayama, Theoretical Physics
H. Aihara, Particle Physics
Y. Suzuki, Observational Particle Physics
M. Fukugita, Astrophysics
K. Inoue, Experimental Physics
M. Jimbo, Mathematics
T. Kajita, Experimental Physics
S. Katsanevas, Experimental Physics
T. Kohno, Mathematics
M. Nakahata, Experimental Physics
M. Nojiri, Theoretical Physics
K. Nomoto, Astronomy
H. Ooguri, Theoretical Physics
K. Saito, Mathematics
K. Sato, Astrophysics
H. Sobel, Experimental Physics
D. Spergel, Astrophysics
N. Sugiyama, Astrophysics
A. Tsuchiya, Mathematics
T. Yanagida, Theoretical Physics
Faculty Members
S. Hellerman, String Theory, Particle Physics
K. Hori, Theoretical Physics
S. Kondo, Mathematics
K. Maeda, Astrophysics
K. Martens, Experimental Physics
S. Mukohyama, Cosmology
H. Murayama, Theoretical Physics
K. Nomoto, Astronomy
K. Saito, Mathematics
S. Sugimoto, Theoretical Physics
M. Takada, Observational cosmology
F. Takahashi, Theoretical Physics
T. Takayanagi, Theoretical Physics
A. Tsuchiya, Mathematics
Y. Toda, Mathematics
M. Vagins, Experimental Physics
N. Yasuda, Astronomy
N. Yoshida, Astrophysics

Postdoctoral Fellows
C. Bambi, Theoretical Physics
C.R. Chen, Theoretical Physics
D.A. Easson, Theoretical Particle Cosmology
S. Harashita, Mathematics
I. Kayo, (JSPS Fellow) Astrophysics
A. Kozlov, Experimental Physics
W. Li, Theoretical Physics
Y.T. Lin, Extragalactic Astrophysics
T. Nozawa, Astronomy
D. Orlando, Theoretical Physics
S.C. Park, Theoretical Physics
M. Pichot, Mathematics
B.A. Powell, Cosmology
S. Reffert, Theoretical Physics
K. Shackleton, Mathematics
K. Shimizu, (JSPS Grant-in-Aid), Astrophysics
J. Shu, Theoretical Physics
J. Schumann, Experimental Physics
J.Y. Tan, Cosmology
M. Valdes (JSPS Fellow)
K. Wang, Particle Phenomenology
Students
D.F. Gao (UC Berkeley), String Theory
T. Imoto (Nagoya), Astrophysics
W. L. Klemm (UC Berkeley), Theoretical Physics
S. Mandal (UC Berkeley), Theoretical Physics
V. Rentala (UC Berkeley), Theoretical Physics
J.V.M. Avelino (Valencia U), Theoretical Physics
Joint Appointments
K. Abe (Tokyo ICRR), Experimental Physics
P. Decowski (NIKHEF), Experimental Physics
M. Doi (U Tokyo), Astronomy
Y. Efremenko (U Tennessee), Experimental Physics
T. Eguchi (Kyoto YITP), Theoretical Physics
S. Enomoto (Tohoku U), Experimental Physics
A. Ferrara (S.N.S. Pisa), Astronomy
S. Freedman (LBNL), Experimental Physics
B. Fujikawa (LBNL), Experimental Physics
M. Fukushima (Tokyo ICRR), Experimental Physics
K. Hagiwara (KEK), Theoretical Physics
L. Hall (UC Berkeley), Theoretical Physics
K. Hamaguchi (U Tokyo), Theoretical Physics
Y. Hayato (Tokyo ICRR), Experimental Physics

Staff

CERN

T. Watari, Theoretical Physics

11

J. Ellis

Director
H. Murayama, Theoretical Physics

IPMU ANNUAL REPORT 2008

IPMU ANNUAL REPORT 2008

10

Organization■ Table 3: The EAB members as of August 2008

IPMU ANNUAL REPORT 2008

Long-term Visitors (more than 1 month)
J. Alwall, Stanford (US)Administrative Division (* section head)
Director K. Nakamura
Head T. Yamanaka
Chief A. Ito
General Management and Personnel
F. Sakamoto*, N. Kurita, F. Miyazoe, M. Miura,
Y. Enomoto, T. Shiga, K. Kawajiri
Sarary and Travel Expenses
K. Sunaga*, N. Ishida, H. Yoshida
International Relations
M. Ozawa*, H. Furuya, R. Ujita, K. Hara,
H. Kuboshima, M. Nishikawa
Finance Planning and Budget Control
Y. Kato*, T. Yamanaka
Contract and Purchasing
N. Abe*, H. Ezawa, S. Utsumi
Library K. Kubota
Computer and Network H. Tanaka, A. Tsuboi
Documentation K. Abe
Kamioka Satellite
M. Nishikawa*, Y. Shimizu, M. Kanazawa,
S. Higashi
Facilities N. Watanabe

Alternative Gravity Theories
		 Einstein’s theory of relativity unifies a 3-dimensional space and a 1-dimensional time
as a spacetime and describes gravity as a fabric of curved spacetime. This picture has beenvery successful in explaining and predicting many gravitational phenomena. Experimentally,
however, we do not know how gravity behaves at distances shorter than 0.01 mm. At shorter
distances, gravity may behave completely differently from what we expect. For example there
may be hidden dimensions at short distances. In fact, many theories, including superstring
theories and M-theory, require the existence of such extra dimensions. Extra dimensions may
exist everywhere in our universe, but they are somehow hidden from us. One possibility
recently investigated very actively is called the brane-world scenario. In this scenario ouruniverse is supposed to be a 3-dimensional surface, called brane, floating in higher-dimensional
space. Although we cannot see extra-dimensions directly, we may hope to detect some indirect
evidence of extra-dimensions in high-energy experiments or cosmological observations.
Gravity at very long distances (for example, billions of light-years) may also be as weird
as at short distances. Precision observational data recently revealed that the expansion of ouruniverse is accelerating. If Einstein’s theory is correct, this requires that more than 70% of ouruniverse is filled with negative pressure, energy. This energy is named dark energy, but we
do not know what it really is. This situation reminds us of a story in the 19th century: when
the perihelion shift of Mercury was discovered, some people hypothesized the existence of aninvisible planet called Vulcan, a so-to-speak dark planet, to explain the anomalous behavior of
Mercury. However, as we all know, the dark planet was not real and the correct explanation
was to change gravity, from Newton’s theory to Einstein’s. With this in mind, we wonder if we
can change Einstein’s theory at long distances to address the mystery of dark energy.

Research Program

M. Bersten, Chile (Chile)
S. Blinnikov, ITEP (Russia)
A. Bondal, Aberdeen (UK)S. Gorchinskiy, Steklov Math Inst (Russia)
A. Hanany, MIT (US)M. Kiermaier, MIT (US)K. Nagamine, Nevada (US)I. Nisoli, Pisa (Italy)
A. Rosly, ITEP (Russia)
E. Sorokina, ITEP (Russia)
M. Verbitsky, Moscow (Russia)
J. Xiao, Tsinghua (China)
F. Xu, Tsinghua (China)

13

K. Heeger (Wisconsin), Experimental Physics
R. Hirschi (U Keele), Astronomy
J. Hisano (Tokyo ICRR), Theoretical Physics
G. Horton-Smith (U Kansas), Experimental Physics
S. Hosono (U Tokyo), Mathematical Physics
K. Izawa (Kyoto YITP), Theoretical Physics
K. Kaneyuki (Tokyo ICRR), Experimental Physics
M. Kashiwara (Kyoto U), Mathematics
M. Kawasaki (Tokyo ICRR), Theoretical Physics
A. Kato (U Tokyo), Mathematical Physics
E. Kearns (Boston U), Experimental Physics
M. Koga (Tohoku U), Experimental Physics
E. Komatsu (U Texas), Cosmology
Y. Koshio (Tokyo ICRR), Experimental Physics
T. Kubota (Osaka U), Theoretical Physics
A. Kusenko (UCLA), Theoretical Physics
M. Limongi (INAF Rome), Astronomy
S. Moriyama (Tokyo ICRR), Experimental Physics
T. Moroi (Tohoku U), Theoretical Physics
K. Nakamura (Tohoku U), Experimental Physics
T. Nakaya (Kyoto U), Experimental Physics
S. T. Petkov (SISSA), Theoretical Physics
A. Piepke (U Alabama), Experimental Physics
Y. Saito (U Tokyo), Mathematics
K. Scholberg (Duke U), Experimental Physics
H. Sekiya (Tokyo ICRR), Experimental Physics
M. Shiozawa (Tokyo ICRR), Experimental Physics
M. Smy (UC Irvine), Experimental Physics
J. Stone (Boston U), Experimental Physics
Y. Takeuchi (Tokyo ICRR), Experimental Physics
A. Taruya (Tokyo RESCEU ), Astrophysics
E. L. Turner (Princeton U), Astrophysics
C.W. Walter (Duke U), Experimental Physics
J. Yokoyama (Tokyo RESCEU), Astrophysics
K. Yoshikawa (U Tokyo), Mathematics■ Table 4: Alternative Gravity Theories Group
MemberMain Interest

Cosimo Bambi

General Relativity. Examination of its predictions in contexts such as the universe andblack hole physics.

Damien Easson

Alternatives to dark energy to explain the acceleration of the Universe. Constraining
gravitational models using observational data and theoretical considerations.

Shinji Mukohyama

Brane world scenarios and the Higgs phase of gravity.

Seong Chan Park

Study of various approaches.

Naoshi Sugiyama

Testing alternative gravity theories using observational data.

Jun’ichi Yokoyama

Model building and constraints on dark energy.

IPMU ANNUAL REPORT 2008

12

Staff

5. Research ProgramMember

Main Interest

Chuan-Ren Chen

Collider phenomenology of the Standard Model (SM) and Models Beyond the Standard
Model (BSM).

Koichi Hamaguchi

BSM, in particular, SUSY models, their LHC phenomenology and application tocosmology (baryogenesis, BBN constraints, dark matter and its signatures).

Junji Hisano

Flavor physics and collider physics of BSM.

William Klemm

How to discover BSM and distinguish from one another at collider. Determination of
spins of new particles.

Hitoshi Murayama

Determination of spin and mass of BSM particles.

Mihoko Nojiri

New physics searches and measurements at LHC

Seong Chan Park

Search for BSM, in particular, extra dimensions and black holes at the LHC. Search for
golden channel for finding black holes at the LHC. MC generator for black hole events(BlackMax).

Vikram Rentala

Spin determination of new particles using quantum interference at the LHC.

Jing Shu

Physics of top, Z’, and higgs.

Kai Wang

Search for BSM and test of SM at the LHC.

IPMU ANNUAL REPORT 2008

Dark Matter Experiment
We know that about 23% of the total energy and matter of the Universe is dark matter,but we do not know what that is made of. The aim of the dark matter search experiment,
XMASS, is to directly observe interactions of the cold dark matter in the large detector placed
underground and to reveal the character of dark matter -- its interactions, mass and so on. We
use 1 ton liquid Xenon detector cooled down at the temperature of -100 degree Celsius andmeasure the scintillation light emanated from the interaction of the dark Matter in the detector.
The experimental sensitivity is about 2 orders of magnitude better than the current best limit.
We hope that we will step in to the discovery region.
In 2008, an underground cavity to house the experiment was completed and following
that, the 10m high cylindrical water tank which contains 800 tons of water to shield gamma
rays and neutrons from nearby rocks was constructed. The major parts of the detector will
be constructed during the summer and autumn in 2009. We aim to start the experiment inNovember, 2009.

Main Interest

Kai Martens

Identification of particle candidates for Dark Matter. Super low background experiments.

Shigetaka Moriyama

Direct detection of Dark Matter.

Masayuki Nakahata

Purification of Xenon for low background experiments.

Yoichiro Suzuki

Discovery of Dark Matter.

Yasuo Takeuchi

Dark Matter search at XMASS.

Inflation and Early Universe
The universe is expanding, and the further away a galaxy is the faster it is moving. We
refer to this phenomenon as Hubble’s law. This observation suggests that, if we could go back intime, the universe was once small, dense and extremely hot. The evolution of the early universe
is described by the Friedmann-Lemaitre-Robertson-Walker (FLRW) universe, a homogeneousand isotropic solution of the Einstein equations for general relativity, and the standard big bang
theory is based on the FLRW universe. The Hubble’s law, big bang nucleosynthesis (BBN) andthe comic microwave background (CMB) radiation provide key support for the standard bigbang theory. These three observations remain important tenets of the early Universe.
Despite its great success the big bang theory is plagued with serious theoretical issues
such as the horizon problem, the flatness problem, and the monopole problem. Those problems
are beautifully solved by the introduction of an inflationary expansion at the very early stageof the universe. What is more important about inflation is that quantum fluctuations of a scalar
field driving the inflation (called an inflaton) generate tiny density perturbations, which canaccount for the seed of the structures such as galaxies and clusters of the galaxies seen in thecurrent universe. The properties of the density perturbations depend on the inflation models,
which can be studied via tiny inhomogeneities in the CMB temperature anisotropy.
The recent progress in observational techniques has enabled us to study the evolution of
the early universe with unprecedented precision, and our understanding of the Universe hassignificantly increased. Nevertheless it is not fully known how the inflation occurred, how theuniverse was reheated after inflation, how the dark matter as well as the baryon asymmetry
were created, whether there is large non-Gaussianity in the density perturbations or not, and soforth. We would like to tackle these questions in order to reveal how the universe evolved fromthe inflationary epoch into what it looks like at present.

Research Program■ Table 5: Collider Phenomenology Group

Member

15

IPMU collider phenomenology group members pursue a broad range of research intesting physics of the standard model and beyond standard model at the colliders, especially
the CERN Large Hadron Collider (LHC). With the upcoming LHC turn-on in 2009, we will
have great opportunities in exploring physics at the TeV scale. This machine will enable us
to systematically investigate electroweak symmetry breaking, to probe new physics like low
energy supersymmetry, extra dimensions or other unexpected exotics. Researchers in the groupare now preparing the theoretical tools to investigate these exciting physics. We also seek theconnection between collider physics and dark matter/cosmic ray physics.

■ Table 6: Dark Matter Experiment Group

Mathematics
In the 17th century, Newton found differential and integral calculus, giving a language
and method to describe the law of dynamics in nature. This is a good example of mathematics
providing the scientific community, and sometimes society in general, with a common
language and method to describe phenomena in their study. This in turn helps to establish
a mathematician’s original concepts. Particularly in recent years the interaction between

IPMU ANNUAL REPORT 200814

Research Program

Collider Phenomenology

Member

Main Interest

Shushi Harashita

Stratifications and foliations on the moduli space of polarized abelian varieties inpositive characteristic and more generally Shimura varieties. Our researches are
expected to contribute to establishing the Langlands correspondence, which is one of
the main problems in number theory and arithmetic algebraic geometry.

Damien Easson

Building concrete models of inflation from string theory. Observable predictions of
nonstandard inflationary theories.

Koichi Hamaguchi

BSM, in particular, SUSY models, their LHC phenomenology and application tocosmology (baryogenesis, BBN constraints, dark matter and its signatures).

Kentaro Hori

Mirror symmetry as a bridge between symplectice geometry and complex geometry,
real algebraic geometry, homological algebra, and their application to string theory.

Ken-iti Izawa

Gauge/gravity-mediated supersymmetry breaking, supersymmetric inflation, unitedmodels.

Shinobu Hosono

Mirror symmetry of Calabi-Yau manifolds, and its applications to Gromov-Witten theory.

Takeshi Kobayashi

Cosmology of the early universe through string theory.

Toshitake Kohno

Shinji Mukohyama

Inflation and brane cosmology.

Construction of topological invariants for braids, knots and 3 dimensional manifold
based on quantum groups and conformal field theory. Algebraic structures of thehomology of the loop spaces of configuration spaces.

Hitoshi Murayama

Leptogenesis. Models of inflation.

Hirosi Ooguri

Application of new mathematical techniques emerging at the interface of string theory
and geometry to solve mysteries of quantum gravity.

Seong Chan Park

Two different types of inflation models, the orbifold GUT inflation and the theory with
f(φ)R term, so called the nonminimal coupling term. The (p) reheating of the inflation
theory with the non-minimal coupling term.

Susanne Reffert

Calabi-Yau geometries in the framework of String compactifications.

Inflationary phenomenology, parameter estimation, and model building. Understanding
inflation as a phenomenon arising from string theory and other extensions of thestandard model of particle physics.

Kyoji Saito

Brian Powell

Construction of primitive forms and associated period maps by use of infinite
dimensional Lie algebras (e.g. elliptic algebras and cuspidal algebras) and theirrepresentation theory. Partition functions of Ising models on (non-commutative)
discrete groups and monoids.

Naoshi Sugiyama

Setting constraints on the inflation models and early universe phenomena such as bigbang nucleosynthesis by using observational data.

Yoshihisa Saito

Representation theory of quantum groups and infinite dimensional Lie algebras, andrelated topics.

Fuminobu Takahashi

Mechanism of inflation and subsequent reheating processes. Origin of density
perturbations and non-Gaussianity. Baryogenesis. Big Bang nucleosynthesis.

Yuji Sano

Canonical Kaehler metrics (especially Kaehler-Einstein metrics) and stability ofmanifolds in the sense of Geometric Invariant Theory.

Jun’ichi Yokoyama

Inflation models. Generation of fluctuations. Stochastic inflation.

Ken Shackleton

Large-scale geometry of groups (eg. mapping class groups), in the sense of Gromov
combinatorial rigidity in families of groups hyperbolic and relatively hyperbolic groups.

Yukinobu Toda

Derived categories of coherent sheaves on algebraic varieties and the theory ofstability conditions on them. It is motivated by several backgrounds, such as minimalmodel theory or homological mirror symmetry. Construction of generalized DonaldsonThomas type invariants, counting semistable objects in the derived category.

Mikael Pichot

Nonpositively curved geometry and geometric group theory (especially CAT(0) andhyperbolic). Foliation theory and topological dynamical systems.

Akihiro Tsuchiya

Conformal field theory based on representation theory of infinite dimensional algebra
and the theory of D-modules.

IPMU ANNUAL REPORT 2008

mathematics and physics has been in full flow.
Gauge theory, quantum field theory, general relativity, superstring theory and thetheory of integrable systems in physics have provided major influences in the development ofmathematics such as algebraic geometry, differential geometry, topology, representation theory,
algebraic analysis and number theory. A large scale development has been newly emerging.
This close collaboration between mathematics and physics is particularly important
for advancing the study of the concept of space and universe that have been developed byscientists such as Kepler, Newton, Gauss, Riemann, Maxwell, Einstein and many others.
For the past twenty years, methods of quantum field theory have had a major influenceon mathematics. Since quantum field theory treats the differential and integral calculus of an
infinite number of degrees of freedom, the rigorous development of quantum field theory inmathematics has yet to be established. Nevertheless, in these twenty years, a lot of concepts
arising from quantum field theory such as quantum groups have had a major influence on
modern mathematics and physics.
Mathematicians at IPMU are working to develop modern mathematics by closely working
with physicists. The following are the fields of mathematics studied at IPMU.

Geometry:
Geometry studies various objects. In Euclidean geometry, beginning 2000 years ago, we
treat triangles, lengths and angles. Since then the geometric objects we study have been widely

developed. In modern geometry, the most important geometric objects are the moduli spaces,
the set of figures (manifolds) with some properties on which we put some new structures.
By using the new concepts of moduli, we can study new geometric objects such as black
holes in general relativity and strings and branes in superstring theory.
There are many branches in geometry such as algebraic geometry, analytic geometry,differential geometry, symplectic geometry, algebraic topology, named according to the objects
and methods for treating them. Recently, however, these various branches of geometries are
deeply connected and influence each other, and individual researchers study them from many
perspectives.
Quite recently the method of category arising from homological method in algebraic
topology is developing strong interactions between mirror symmetry and duality theory arisingfrom superstring theory. Furthermore the theory of quantum invariants of low dimensional
manifolds has begun with the study of quantum theory such as integrable systems, soliton
equations and the conformal field theory. These quantum invariants turn out to have a deep

Research Program

Cosimo Bambi

General Relativity. Examination of its predictions in contexts such as the universe andblack hole physics.

17

Main Interest■ Table 8: Mathematics Group (Geometry)

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Member16

Research Program■ Table 7: Inflation and Early Universe GroupIPMU ANNUAL REPORT 2008

■ Table 9: Mathematics Group (Algebra)■ Table 10: Mathematics Group (Analysis)
MemberMain Interest

Michio Jimbo

Quantum integrable systems. Algebraic description of correlation functions of integrable
1D spin chains such as the XXZ chain.

Kentaro Hori(2,2) and (0,2) superconformal field theories and conformally invariant boundary
conditions.

Hirosi Ooguri

Conformal field theories in diverse dimensions that are relevant to dynamics of stringsand branes in superstring theory. Application of conformal field theory techniques tostudy the landscape of string vacua.

Domenico Orlando

Spin chains (XXZ model and related two-dimensional lattices) in connection to dimer
models and topological strings.

Susanne Reffert(Quantum) dimer models. (Quantum) crystal melting and spin chains.

Yoshihisa Saito

Representation theory of quantum groups and infinite dimensional Lie algebras andrelated topics.

Kenneth J. Shackleton

Geometric group theory. Hyperbolic and relatively hyperbolic groups. Low-dimensional
topology. Teichmüller theory and mapping class groups. Curve complexes, pants
complexes.

Tadashi Takayanagi

Solvable conformal field theories in their applications to the descriptions of tachyon
condensation in string theory. Solvable matrix models and their application to nonperturbative formulations of quantum gravity.

MemberMain Interest

Shushi Harashita

Stratifications and foliations on the moduli space of polarized abelian varieties inpositive characteristic, and more generally Shimura varieties.

Mikael Pichot

Measured dynamical systems. Representation theory. Functional analysis, operator
algebras (C*-algebras and von Neumann algebras)

Satoshi Kondo

Arithmetic geometry. Use of tools from algebraic geometry to study problems in number
theory.

Akihiro Tsuchiya

Conformal field theory based on representation theory of infinite dimensional algebra
and the theory of D-modules.

Mikael Pichot

Bruhat-Tits buildings. Group theory and group algebras. K-theory, the Baum–Connes
conjecture and the property of rapid decay. Noncommutative geometry.

Kyoji Saito

Construction of primitive forms and associated period maps by use of infinite
dimensional Lie algebras (e.g. elliptic algebras and cuspidal algebras) and theirrepresentation theory. Partition functions of Ising models on (non-commutative)
discrete groups and monoids.

Akihiro Tsuchiya

Conformal field theory based on representation theory of infinite dimensional algebra
and the theory of D-modules.

Research Program

Algebra studies the system of numbers such as integers and polynomials. There are anumber of branches of algebras that are divided by the objects and methods they treat. They
are commutative algebra, number theory, non-commutative algebra and representation theoryof various kinds of algebras.
Commutative algebra is important as a language and method to study algebraic
geometry and number theory. Number theory has a long history as a study of properties ofintegers and prime numbers. The most important objects here are Galois groups. They arestudied by using representations of Galois groups, realized as various cohomology groups on
manifolds studied in arithmetic geometry. The famous conjecture due to Fermat was solved in
the mid-1990s by using a relationship between zeta functions from representation theory of
Galois groups and the distribution of prime numbers.
The zeta function in number theory resembles closely various kinds of partition functions
that express energy distribution of physical systems. This is the origin of a deep interaction
between mathematics and physics in arithmetic.
Representation theory studies non-commutative algebras by realizing them as linear
operators on some infinite dimensional vector space. Quite recently, under physical influences,
the representation theory of infinite dimensional algebra, such as Affine Lie algebras, Kac-Moody
Lie algebras, Virasoro algebras, vertex operator algebras and various kinds of quantum groups
has been developed. Another kind of representation theory as linear differential operators onsome kinds of infinite dimensional homogenous spaces has been developed.
These connect analyses on various kinds of manifolds and the geometry of thesemanifolds quite deeply. The methods used are highly abstract and depend on various kinds ofhomological algebras. These are also related to superstring theory as a concept and method ofanalysis of infinite degrees of freedom.

Analysis studies differential and integral calculus. It is the most fundamental subject inmathematics.
The theory of a module over the ring of differential operators has been developed by
Mikio Sato as a theory of D-modules. The theory of D-modules has a deep influence on thevarious areas of mathematics. For example, these theories have a deep influence on the theoryof soliton equations such as K-dV equations arising from non-linear equations in physics.
Now the theory of D-modules and soliton equations has entered into the mainstreamof modern mathematics and physics. In addition, this theory has developed with integrable
systems such as 1-dimensional quantum many-body problems, 2-dimensional solvable lattice
modules and conformal field theory. These theories give basic languages and methods to realize
non-perturbative approaches of the superstring theory.

19

18

Research Program

Algebra:Analysis:

Models beyond the Standard Model
After k B , c and ℏ are set to unity, [length] = [energy]-1 is the only dimension left inphysics. The fundamental law of physics in nature has been probed down to the length scaleof order 10-3 fm = 10-8Å , which is equivalent to the energy scale of order 102 GeV = 1011 eV.
Nothing is known for sure yet, however, what is happening at even shorter distance scales.

IPMU ANNUAL REPORT 2008

connection with other quantum invariants such as Gromov-Witten-Thomas invariants arisingfrom gauge theory in modern physics.

IPMU ANNUAL REPORT 200820•

The Higgs boson is the only scalar field in the Standard Model; all other dynamical
degrees of freedom in the Standard Model are either fermions or vector fields.
Why does the Standard Model has one scalar field, and just one? Why does its
condensation develop?
The Newton constant G N 〜 6.7 × 10 -11m 3kg/s 2 corresponds to an energy scale
1/√G N ℏ /c 3 〜 1019 GeV. Why is there a huge hierarchy of order 1017 between thisenergy scale and the weak boson masses of order 102 GeV, and how can the weakboson masses remain so small under quantum corrections?

In order to solve these questions theoretically, various models beyond the Standard
Model have been constructed so far, and we still continue to do so in quest of a better solution
to these problems. Once we have concrete models, we can examine whether such models arereally consistent with all the available experimental data, predict what kind of signals can be
expected in future experiments, and even propose experiments to confirm such models.
The origin of the masses of the weak bosons is not the only puzzle of the Standard
Model. It is known that huge fraction of the universe consists of dark matter and dark energy. It
is very unlikely that dark matter is actually the ordinary matter particles in the Standard Model.
This is where we find another motivation to extend the Standard Model. Our universe may
have become so large because of an inflationary process in the early universe, and quantum
fluctuations of a scalar field may become the fluctuations of density in the early universe, which
eventually become galaxies and clusters of galaxies. So, here is another motivation to introduce
a new degree of freedom and extend the Standard Model. Such cosmological issues as inflation,
primordial density perturbations and dark matter motivate extensions of the Standard Model,
and models in quantum field theories are the appropriate framework in order to work on theseissues.
Recent reports of excess in high-energy cosmic ray fluxes, deviation from the Standard-

Research Program■ Table 11: Models Beyond the Standard Model Group
MemberMain Interest

Chuan-Ren Chen

Collider phenomenology of the Standard Model and models beyond the Standard
Model, including SUSY and Little Higgs models. Examining the interplay between the
LHC phenomenology and cosmology.

Damien Easson

Physics beyond the standard model to explain the origin of the dark components of the
Universe.

Koichi Hamaguchi

SUSY models and their LHC phenomenology and application to cosmology(baryogenesis, BBN constraints, dark matter and its signatures).

Junji HisanoSupersymmetric models. Search for clues in accelerator and non-accelerator physics.
Construction of realistic models at TeV and at GUT scales.

Ken-iti Izawa

Gauge/gravity-mediated supersymmetry breaking. Supersymmetric inflation. Unitedmodels.

William Klemm

Signatures from various beyond the standard models. Distinguishing from one anotherat a collider. Determination of spins of new particles.

Sourav Mandal

Addressing questions in particle phenomenology. Dark matter candidates and theirexperimental signatures.

Hitoshi Murayama

Supersymmetry breaking models and phenomenology.

Hirosi Ooguri

General constraints on low energy effective theories that arise from superstring
theory or any other consistent theory of quantum gravity. Supersymmetry breaking
mechanisms in gauge theories and superstring theory.

Seong Chan Park

Various ideas of the BSM: warped extra dimension, model of EWSB in the context ofGauge-Higgs unification, orbifold GUT, littel Higgs etc.

Vikram Rentala

Spin determination using quantum interference at the LHC.

Jing Shu

Warped extra dimension models. Strongly coupled theory.

Fuminobu Takahashi

Supersymmetry. Link between supersymmetric models and cosmology, such as SUSY
breaking, dark matter, and SUSY inflation models.

Kai Wang

Model building of BSM physics, particular SUSY models as well as neutrino models.
Their collider tests at the CERN LHC.

Taizan Watari

Model building and phenomenology beyond the Standard Model in general.
SUSY breaking and mediation, flavor pattern, GUT, inflation, Peccei-Quinn axion,
quintessence, landscapes.

Tsutomu Yanagida

PAMELA and ATIC data searching for a convincing model that explains the observed
anomalies.

21•

Model prediction of the anomalous magnetic moment of muon, and some other reports ofdeviations from the Standard Model predictions may also be indications of some physics beyond
the Standard Model. We therefore seek for theoretical models that account for these phenomena.
We also address the following problems. The Standard Model is described by a quantum
field theory with about 30 parameters, and the values of these parameters can be determined
only by measuring them experimentally. Would it be possible to determine them theoretically,
by considering theoretical frameworks that contain the Standard Model?
The thermal history of early universe is described very well by the Standard Model at least
back to the era with the temperature of order MeV, but it is only with several input parametervalues of initial condition of the universe. Those initial condition parameters include baryon
asymmetry, normalization of density contrast and the amount of dark energy. How are these
initial condition parameters set? Once again, it is impossible to think about such problems
without a model that extends the Standard Model.

IPMU ANNUAL REPORT 2008

Research Program

Up to now, we have seen that a quantum field theory with quarks, leptons and vectorbosons for three different forces describes reasonably well all the experimental data available
so far. Among the vector bosons, however, those corresponding to the weak force (which is
responsible for the β-decay of nucleons) are known to have masses. There are three such vectorbosons, and they are called W +, W – and Z bosons, or weak bosons, as a whole. From theconsistency of quantum field theories, it is known that something must be behind the non-zeromasses of these vector bosons. It has not been confirmed experimentally yet how these masses
are generated.
What is called the Standard Model provides a simple theoretical idea how the weakbosons acquire masses. According to the Standard Model, the masses originate fromcondensation of quanta of a new scalar boson, called Higgs boson. The Higgs boson is the last
missing piece of the Standard Model, and will be discovered in experiments in near future, if the
weak bosons have masses through the mechanism predicted by the Standard Model.
Is that the end of the story? Maybe ..., but maybe not. Let us think about the following
questions.

Member

Main Interest

Kunio Inoue

Neutrino oscillation. Neutrino geophysics. Neutrino astrophysics. Neutrinoless double
beta decay. Directional measurement of anti-neutrinos.

Takaaki Kajita

Atmospheric neutrino. Long baseline experiments. Neutrino oscillations.

Kai Martens

Super-Kamiokande experiment for detecting neutrinos from galactic supernova (type II)
explosion.

Hitoshi Murayama

Neutrino oscillation phenomenology. KamLand.

Masayuki Nakahata

Boron-8 solar neutrino measurement by Super-Kamiokande detector. Precise
measurement of the energy spectrum for the confirmation of matter effect of theneutrino oscillation.

Jan Schuemann

Improving the Super-Kamiokande detector by introducing Gadolinium. Detection ofneutrinos from distant supernovae.

Henry W. Sobel

Super-Kamiokande and T2K experiments. Neutrino physics. Supernova. Proton decay.

Yasuo Takeuchi

Low-energy neutrino observations in Super-Kamiokande.

Mark Vagins

Measurements of neutrinos and antineutrinos from supernovae, the sun, and nuclear
power reactors. T2K experiment. GADZOOKS experiment.

Research Program■ Table 12: Neutrino Physics Group

23

What are the building blocks of nature? Most people have heard of electrons, which areindeed (as far as we can tell) fundamental particles, as well as protons and neutrons, which arethemselves composite objects composed of much smaller fundamental particles called quarks.
But there are much more unusual fundamental particles, too, and perhaps the most mysteriousof these are the neutrinos.
The Standard Model of particle physics contains three generations of fundamental
particles. In each of these generations, or families, there are two quarks and two much lessmassive particles called leptons. In the first family one such lepton is the electron, which carries
an electric charge, and the other first-generation lepton is called the electron neutrino, which iselectrically neutral. The second generation contains two more types of quarks, a charged lepton
called the muon, and the muon neutrino, while the third family contains a final pair of quarks,a charged lepton called the tau, and a tau neutrino.
The three types of neutrinos, the electron neutrino, the muon neutrino, and the tau
neutrino, are exceedingly challenging to study, because they hardly interact with matter at all.
That means neutrino detectors need to be very big, very sensitive, or both. At IPMU we haveteams of researchers working on some of the best and most famous neutrino detectors in theworld.
The Super-Kamiokande [Super-K] detector is a 50,000 ton tank of water buried deep
under the Japanese Alps. By studying neutrinos generated by cosmic ray interactions in the
Earth’s atmosphere, in 1998 Super-K made the stunning discovery that different types ofneutrinos can spontaneously transform from one type to another, a process known as neutrino
oscillation. This also implied that at least two of the three neutrinos have a small, but non-zero
mass, something not predicted by the Standard Model. This was the first time since its inceptionthat the Standard Model needed to be revised based on solid experimental data. In 2001
Super-K made a crucial contribution to the solution of the solar neutrino problem by indicatingthat solar neutrinos produced by the Boron-8 reaction in the Sun could change their flavor
while in flight, and uniquely selected the large mixing angle solution to the problem. IPMU
members are now working on GADZOOKS!, an initiative to enrich the ultrapure water inside
Super-Kamiokande with the element gadolinium. This will greatly reduce backgrounds and,among many other physics benefits, should allow the first-ever detection of a constant streamof neutrinos from distant supernovas.
The KamLAND neutrino detector is located in the same ancient zinc mine as SuperKamiokande, but instead of water it is filled with 1,000 tons of liquid scintillator. This makes itvery sensitive, especially to low energy neutrinos from nuclear reactors and those generated
by radioactive decays within the Earth itself. In 2002 KamLAND was the first experiment toobserve disappearance of reactor neutrinos, which matched other experiments’ solar neutrino
data in spectacular fashion. After lowering the energy threshold at which their data could beanalyzed, in 2005 KamLAND was the first experiment to detect geoneutrinos, ushering in an
entirely new way to study the Earth’s interior. Also in 2005, KamLAND saw evidence of spectral
distortions in the reactor neutrino signal; clear proof of neutrino oscillations. IPMU members are
currently working on modifying KamLAND to detect very low energy solar neutrinos producedby the Beryllium-7 reaction in the Sun, as well as transforming the KamLAND detector into ahuge neutrinoless double beta decay experiment via the addition of Xenon-136 to the detector
volume.
As we continue to understand the mysterious neutrinos, as well as the varied processes
which produce them within the Earth, upon the Earth, above the Earth, within the Sun, andinside exploding stars, IPMU researchers are using these tiniest of particles to probe the mostinaccessible places and farthest reaches of the universe itself.

Observational Cosmology
Understanding the nature and origin of large-scale structure in the Universe is one ofmost compelling issues in observational cosmology. The currently most conventional scenario
is given by the cold dark matter (CDM) dominated model, where gravitational instability mainly
driven by spatial inhomogeneities of CDM distribution amplifies the seed density perturbations
to form the present-day hierarchical structures. Therefore revealing distribution and amount of
CDM is crucial to understanding the formation of large-scale structure. In addition the presenceof dark energy drives the accelerating cosmic expansion, and therefore affects the growth ofstructure formation. The dark matter distribution and the nature of dark energy can be exploredfrom massive galaxy surveys. We have worked on measurements from current surveys and are
actively involved in the planning and design of the future survey with Subaru Telescope, 8.2
meter optical-infrared telescope at the summit of Mauna Kea (4,200m), Hawaii.

Weak gravitational lensing:
The path of light ray emitted by a distant galaxy is bent by gravitational force ofintervening large-scale structure during the propagation, causing the image to be distorted the so-called weak lensing shear. Conversely, measuring the coherent shear signals between

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IPMU ANNUAL REPORT 200822

Research Program

Neutrino Physics

IPMU ANNUAL REPORT 200824

■ Table 13: Observational Cosmology Group
MemberMain Interest

Yen-Ting Lin

Formation and evolution of galaxies. Roles of galactic mergers and feedback fromsupermassive blackholes on the formation of giant galaxies. Data analysis of BOSS
survey and radio surveys to elucidate the phenomenon of radio-loud active galactic
nuclei. Evolutionary connections between galaxies at z=0 and z=1 using future HSC
data.

Issha Kayo

Extraction of cosmological information from the large-scale structure of the Universe,
particularly using the actual data taken by the Sloan Digital Sky Survey and virtual
data generated by N-body simulations. Construction of a homogeneous catalog ofgravitationally lensed quasars to constrain the dark energy.

Keiichi Maeda

Supernova cosmology, especially in the evaluation of applicability of Type Ia
supernovae as cosmological distance indicators.

Takaya Nozawa

Evolution of dust throughout the cosmic history. Evaluation of the impacts of dust on
the observational cosmology using Type Ia supernovae as a standard candle.

Jan Schuemann

Study of neutrino fluxes and their origin using Super-Kamiokande. Improving theSuper-Kamiokande by adding Gadolinium.

Naoshi Sugiyama

Investigation of the Cosmic Microwave Background. Testing of dark energy models
using observational data such as the baryon acoustic oscillation and gravitational
lensing.

Masahiro Takada

Observational and theoretical studies of gravitational lensing caused by hierarchicalstructures of the universe. Nature of dark side of the universe, dark matter and darkenergy, with the gravitational lensing observables. Future Subaru Weak Lensing
Survey.

Jun’ichi Yokoyama

Analysis of CMB anisotropy.

Naoki Yoshida

Large galaxy surveys and weak lensing observations. Computer simulations togenerate a large number of mock catalogues for future observational programs.

Research Program

The HSC, currently under construction, is the project to replace the prime focus cameraof Subaru Telescope with a new camera that has wider field-of-view than the current one by afactor of 10. Fully utilizing the unique capabilities of HSC, its survey speed and excellent image
quality, we are planning and designing a massive galaxy survey that covers an area of a few
thousands square degrees and reaches to the depth to probe the Universe up to redshifts ofa few. In fact these data sets will provide us an ideal data sets for exploring the nature of dark
matter and dark energy via measurements of cosmological observables available from thedata, weak lensing and galaxy clustering statistics. We, IPMU members, are actively involvedin this HSC project, and working on the designing and planning of HSC galaxy survey anddevelopment of data analysis pipeline.

Over the next six years (2008-2014), the SDSSIII will exploit the unique wide-field
spectroscopic capability of the Apache Point Observatory’s 2.5-meter telescope, extending
the previous SDSS surveys to a deeper universe with the improved spectrograph. We, IPMU
members, are involved in SDSSIII and can freely access to the data sets before the publicdata release. In particular, one of the planned surveys, the Baryon Oscillation Spectroscopic
Survey (BOSS) will map the spatial distribution of luminous galaxies and quasars to detect thecharacteristic scale imprinted by baryon acoustic oscillations in the early universe. Using theacoustic scale as a standard ruler, we can infer the angular diameter distance to the galaxy
redshift, thereby enabling to test the models of dark energy. We are planning to develop an
optimal method for measuring properties of galaxy clustering in order to obtain unbiased
estimates on the acoustic scale as well as on cosmological parameters.

Proton Decay
The stability of the proton represents one of the greatest theoretical and experimental
challenges in particle physics today. In most grand unified theories, particularly those with a
TeV intermediate mass scale, the proton “wants” to decay. Experimentally, however, the proton
seems determined to outlive us all. Beginning with the first large-scale searches in the 1980’s,
one promising theory after another has floundered on the shoals of nucleon decay. To date, nohint of a nucleon decay signal has emerged.
In spite of this, the study of nucleon decay provides one of the few approaches to the
problem of confronting grand unified theories with experimental data, and any progress toward
this goal has unique value for the future development of physics. This program has alreadybeen a success. The simplest unification model, minimal SU(5), has been ruled out by theexperimental results. Every subsequent grand unification theory will remain only a mathematicalconstruct if further experimental information is not available.
The search for nucleon decay requires massive detectors. A search with a sensitivity of33
10 years, for example, requires a detector with approximately 1033 nucleons. Since there are 6
× 1029 nucleons per ton of material, this implies detectors of multi-kiloton scale.
The “classical” proton decay mode, p → e+π0, can be efficiently detected with low
background. At present, the best limit on this mode ( τ/β > 8.2 × 1033 yr, 90% CL) comes froma 141 kton-yr exposure of Super-Kamiokande. The detection efficiency of 44% is dominated by
final-state π0 absorption or charge-exchange in the nucleus, and the expected background is 2
events/Mton-yr.
Supersymmetric theories favor the mode p →νK +, which is experimentally more difficult
due to the unobservable neutrino. The present limit from Super-Kamiokande is the result ofcombining several channels, the most sensitive of which is K + → μ + ν accompanied by a deexcitation signature from the remnant 15N nucleus. Monte Carlo studies suggest that this mode
should remain background free for the foreseeable future. The present limit on this mode is τ/
β > 2.3 × 1033 yr (90% CL).
Recent theoretical work suggests that if super-symmetric SO(10) provides the framework

25

Research Program

Hyper Suprime Camera (HSC):

Sloan Digital Sky Survey III:

IPMU ANNUAL REPORT 2008

galaxy images allows us to reconstruct the distribution of invisible dark matter. Moreover, since
the weak lensing shear deals with the light propagation on cosmological distance scales, thelensing strengths depend on the cosmic expansion history that is sensitive to the nature of darkenergy. Thus weak lensing based observables offer a powerful way for studying the natureof invisible components, dark matter and dark energy. We are carrying out observational andtheoretical studies of weak lensing phenomena using our own Subaru data sets as well as
simulations of large-scale structure.

Main Interest

Takaaki Kajita

Updated searches for proton decays.

Jan Schuemann

Updated proton lifetime measurement using Gadolinium-enriched Super-Kamiokande.

Henry W. Sobel

Updated measurement of proton decay.

Mark Vagins

Improving the proton decay measurement in water-based detectors via detection offree neutrons significantly suppressing atmospheric neutrino-induced proton decay
backgrounds. Development of next-generation, megaton-scale experiments for proton
decay.

IPMU ANNUAL REPORT 2008

26

String Theory
In the past few hundred years, scientists have searched for fundamental laws of natureby exploring phenomena at shorter and shorter distances. Does this progression continue
indefinitely? Surprisingly, there are reasons to think that the hierarchical structure of nature willterminate at 1035 meter, the so-called Planck length. Let us perform a thought-experiment to
explain why this might be the case. Physicists build particle colliders to probe short distances.
The more energy we use to collide particles, the shorter distances we can explore. This has been
the case so far. One may then ask: can we build a collider with energy so high that it can probe
distances shorter than the Planck length? The answer is no. When we collide particles with suchhigh energy, a black hole will form and its event horizon will conceal the entire interaction area.
Stated in another way, the measurement at this energy would perturb the geometry so muchthat the fabric of space and time would be torn apart. This would prevent physicists from everseeing what is happening at distances shorter than the Planck length. This is a new kind of
uncertainty principle. The Planck length is truly fundamental since it is the distance where thehierarchical structure of nature will terminate.
Space and time do not exist beyond the Planck scale, and they should emerge froma more fundamental structure. Superstring theory is a leading candidate for a mathematicalframework to describe physics at the Planck scale since it contains all the ingredients necessary
to unify general relativity and quantum mechanics and to deduce the Standard Model ofparticle physics. Superstring theory has helped us solve various mysteries of quantum gravity

MemberMain Interest

Damien Easson

Building models of inflation from string theory. Time dependent solutions in string
theory. Brane Gas model of string cosmology.

Dongfeng Gao

Mathematical aspects of string theory.

Simeon Hellerman

String theory and its connections to quantum gravity, cosmology, condensed matter,particle physics and mathematics. Development of tools to understand and apply string
theory in generic environments.

Kentaro Hori

4d N=1 string compactifications in various frameworks, especially, worldsheet
approaches to Type II orientifolds with D-branes and fluxes, M-theory on G_ 2
holonomy manifolds, worldsheet approaches to heterotic strings. Topological strings aswell as supersymmetric gauge theories in various dimensions.

Shinobu Hosono

Mirror symmetry of Calabi-Yau manifolds and its applications to Gromov-Witten theory.

Toshiya Imoto

Holographic QCD.

Wei LiBlack holes. Gauge/Gravity correspondence. 3D quantum gravity.

Shinji Mukohyama

String cosmology.

Hirosi Ooguri

Development of theoretical tools to apply string theory to questions relevant to highenergy physics, astrophysics, and cosmology.

Domenico Orlando

Exact CFT solutions. Topological strings. Effective descriptions for M-theory.

Susanne Reffert

String compactifications. Topological string theory.

Ken Shackleton

Connection between string theory and the completion of the Weil-Petersson metric on
Teichmueller space.

Shigeki Sugimoto

Conjectured duality between string theory and gauge theory, and its application to QCD
and hadron physics.

Tadashi Takayanagi

String theory as quantum gravity especially from the viewpoint of holography such as
AdS/CFT duality. Relation between the entanglement entropy and the gravitational
entropy such as the black hole entropy.

Taizan Watari

String phenomenology. Inflation (in the past). GUT and F-theory compactification.

Research Program

Member■ Table 15: String Theory Group27■ Table 14: Proton Decay Groupsuch as the information paradox of black holes posed by Stephen Hawking. The theory has
given us insights into early universe cosmology and models beyond the Standard Model ofparticle physics. It provides powerful tools study many difficult problems in theoretical physics- often involving strongly interacting systems - such as QCD (theory of quark interactions),
quantum liquid and quantum phase transitions. It has also inspired many
important developments in mathematics. All of these aspects of string theory are vigorously
investigated at IPMU.

Structure Formation
		 There are rich structures in the present-day universe, such as stars, galaxies, and largescale structure. We study how these objects are formed using large computer simulations andsophisticated theoretical models.
The standard Big Bang model posits that the universe was nearly homogeneous and very
hot when it was born. Tiny “ripples” in the distribution of matter are generated through a rapid
expansion phase called inflation in the very early universe. These primeval density fluctuations
grow by the action of gravity, eventually forming luminous objects such as galaxies.

IPMU ANNUAL REPORT 2008

Research Programfor grand-unification, the proton lifetime (into the favored νK + decay mode) must lie within
about one order of magnitude of present limits. Similarly, SO(10) theories suggest τ/β(eπ0)≈1035
years - about a factor of ten beyond the present limit. Thus, continued progress in the search fornucleon decay inevitably requires larger detectors.
Moreover, the enormous mass and exposure required to improve significantly on existing
limits (and the unknowable prospects for positive detection) underline the importance of any
future experiment’s ability to address other important physics questions while waiting for the
proton to decay. Proton decay experiments have made fundamental contributions to neutrino
physics and particle astrophysics in the past, and any future experiment must be prepared to do
the same.

Main Interest

Keiichi Maeda

Theory of nucleosynthesis and radiation transfer. Observations of individual
supernovae.

Naoshi Sugiyama

Investigation of linear evolution of structure in the universe and effect of magnetic
fields.

Masayuki Nakahata

Search for supernova neutrinos using Super-Kamiokande detector. It covers bothsupernova burst neutrinos and supernova relic neutrinos.

Masahiro Takada

Observational and theoretical studies of gravitational lensing caused by hierarchicalstructures of the universe. Nature of dark side of the universe, dark matter and darkenergy, with the gravitational lensing observables. Future Subaru Weak Lensing
Survey.

Ken’ichi Nomoto

Type Ia supernova cosmology to provide precision constraints on cosmic accelerationand the equation of state of dark energy by clarifying the progenitors and explosion
mechanism. Evolution and nucleosynthesis of first stars to study cosmic chemical
evolution. Gamma-ray bursts and hypernovae to clarify the production mechanisms ofhuge explosion energy from black holes and neutron stars.

Naoki Yoshida

Formation of stars, galaxies and the large-scale structure of the universe using
supercomputer simulations.

Takaya Nozawa

Evolution of dust at high redshifts, considering the formation of dust in supernovae anddestruction of dust in the shock driven by supernovae.

Jan Schuemann

Yen-Ting Lin

Atacama Cosmology Telescope (ACT) project, a large cluster survey that detects
clusters via the Sunyaev-Zel’dovich effect (SZE). Analyses of the data from ACT,
SDSS, and Subaru, to study the evolution of galaxies within clusters, as well as to use
the statistical properties of clusters (such as clustering and abundance) to constrain
cosmology.

Gadolinium-upgrade for Super-Kamiokande for observing neutrinos from supernova
formations, past and present.

Henry W. Sobel

Super-Kamiokande and T2K for studying neutrino physics, supernova, and proton
decay.

Yasuo Takeuchi

Real-time neutrino burst search in Super-Kamiokande.

Shinya Wanajo

Origin of elements that are synthesized in supernovae. Nucleosynthesis of r-process
species (e.g., gold, platinum, uranium, etc.) in core-collapse supernovae.

Mark Vagins

Detection of the diffuse neutrino background produced by distant supernovae.
Improvement of Super-Kamiokande experiment’s response to the arrival of a burst ofneutrinos from a supernova within our galaxy.

Supernovae are explosions of stars at the end of their lives. Core-collapse supernovae(Type II, Ib, and Ic) are the outcome of the gravitational collapse of massive stars (i.e., morethan ten times as massive as the Sun), followed by formation of a neutron star or a black hole,announced by a huge amount of neutrinos. Thermonuclear supernovae (Type Ia) are explosions
driven by nuclear reactions within a white-dwarf star.
Supernovae provide natural laboratories for a range of physical processes, suchas neutrino physics, some of which can not be addressed by experiments on the Earth.
Furthermore, they are the main contributors of heavy elements in the Universe; without them,baryons in the Universe would be only hydrogen, helium and some minor elements, although
in reality the Universe is filled with about a hundred different sorts of elements. Their energy
produced at the explosions is huge, and supernova explosions could play important roles evenin formation and evolution of galaxies. Finally, importance of understanding their natures ishighlighted by their use as cosmological distance indicators, leading to the discovery of the
Dark Energy.

Research Program

MemberIssha Kayo

Extraction of cosmological information from the large-scale structure of the Universe,
particularly using the actual data taken by the Sloan Digital Sky Survey and virtual
data generated by N-body simulations. Construction of a homogeneous catalog ofgravitationally lensed quasars to constrain the dark energy.

29

Main Interest

IPMU ANNUAL REPORT 2008

■ Table 17: Supernova Group

MemberSupernova

IPMU ANNUAL REPORT 2008

Our understanding of the above issues is still far from satisfying, with various issues still
under investigation. At IPMU, we cover most of the topics related to supernovae; Evolution ofstars toward supernovae (K. Nomoto), theory of core-collapse and explosion (K. Sato), theoryof neutrinos from supernovae (K. Sato) and attempt to detect these neutrinos at Kamioka (M.
Vagins), theory of thermonuclear explosion (K. Nomoto), nucleosynthesis of elements up toiron (K. Maeda) and beyond (S. Wanajo), formation of dust grains (T. Nozawa), theory of opticalemission from supernovae and evaluation of their use as cosmological distance indicators (K.
Nomoto, K. Maeda), and observations using the Subaru telescope (K. Maeda). By unifying
these attempts, we aim to comprehensively understand supernovae and their influences on theevolution of the Universe.

■ Table 16: Structure Formation Group28

Research Program

The energy content of the universe and basic statistic that describe the condition of theearly universe have been determined with great accuracy from recent observations of cosmic
microwave background radiation, large-scale galaxy distribution and distant supernovae.
Cosmology is now at a stage where theory can make solid predictions, whereas a broad class ofobservations can be directly used to verify them.
Our primary interests are in primordial star formation in the early universe, the formationand evolution of galaxies, and the formation of large-scale structure. Results from these studies
will be used for making good plans and proposals for next generation large observational
programs such as Subaru-HSC dark energy survey.

6. Research Highlight■ Figure 8: A simulation image of gravitational
lensing in a cluster region (about 1 degree on aside). The color scales show the mass density
field projected between galaxies of redshift 1 andan observer; the redder color region shows theregion with higher mass density. This simulated
region has a very massive cluster at the middle.
The small rods at each position demonstrate thata background galaxy image is deformed along therod. The size of rod corresponds to the strengthof lensing distortion. It is clear that, around a
massive cluster, background galaxy images are
preferentially tangentially deformed with respect
to the cluster center, thus causing characteristic
coherent pattern of galaxy images. (Credit: T.
Hamana, NAOJ)

Research Highlight
31

Gravitational lensing is one of the most important predictions of Albert Einstein’s gravity
theory, General Relativity. When matter or energy (the two are equivalent in General Relativity)
exists, the surrounding space-time is curved, and the strength of gravity is described by thecurvature of space-time. When a light ray propagates through such a curved space-time, thelight cannot travel straight and is bent, which is the so-called gravitational lensing. Conversely
measuring the gravitational lensing allows us to recover the distribution of total matter whatever
the matter is visible or not. Thus gravitational lensing thus opens up a window for unveiling theinvisible matter in the universe, thereby allowing us to explore the nature of invisible mysterious
components of the universe, dark matter and dark energy.
A cluster of galaxies containing from hundreds to thousands of galaxies within a regionof a few Mpc scales in radius is the most massive, gravitationally bound objects in the universe.
Thus galaxy clusters display most striking lensing phenomena. One of such examples isdemonstrated in a simulated image of Figure 8, showing how galaxy images behind a cluster
are affected by the gravitational lensing effect of a cluster. The gravitational lensing diffraction
is slightly different for neighboring light rays on the sky due to the gradient of the gravitational
field such that a light ray closer to the cluster center is more deflected by lensing and vice versa.
As a result, the shape of distant galaxy image is slightly deformed or sheared by the lensing,which is the so-called weak lensing shear.
For each galaxy image, we cannot discriminate lensing distortion signal from its
intrinsic shape as the galaxy shape is not circular and has various intrinsic shapes. However, as
demonstrated in Figure 8, this gravitational shearing effect causes a coherent distortion patternof background galaxy images. Galaxy images are preferentially deformed tangentially withrespect to the cluster center, and this coherent signal can be discriminated in a statistical sense.

IPMU ANNUAL REPORT 2008

IPMU ANNUAL REPORT 200830

Research Program

Measuring dark matter distribution in a galaxy cluster region
with gravitational lensing

IPMU ANNUAL REPORT 2008

■ Figure 9: The weak lensing measurement result for thecluster A1689. The gray image shows the Subaru imaging
data of A1689, while the blue contours show the massdensity field reconstructed from the measurement of weaklensing shearing effect on background galaxy images. The
mass density field indeed gets higher towards the cluster
center, and the properties of mass distribution is foundto be in good agreement with the cold dark matter model
predictions. On the other hand, the red contours show the
distribution of member galaxies, which well follows themass distribution as expected.

Research Highlightinferred from the lensing signal is much (by a factor 10) greater than the sum of member
galaxies and intracluster hot gas, strongly suggesting the existence of invisible matter, i.e. dark
matter on cluster scales.
These properties of mass distribution are found to be in good agreement with thepredictions from cold dark matter dominated structure formation scenario. The model
predictions are derived based on several critical assumptions: dark matter is cold (negligible
intrinsic velocity dispersion) and interacts with other particles only via gravity. Therefore adetailed comparison of the reconstructed mass distribution with the theoretical predictions canbe used to test the cold dark matter paradigm as well as to derive constraints on the nature ofdark matter, which is the goal of our lensing study. The team is now collecting Subaru data ofhomogenous cluster sample (about 40 clusters as of May 2009) and will hopefully report thederived constraints on cold dark matter model in the near future.
Further reading: arXiv:0903.1103 (submitted to PASJ)

Large modern-day telescopes have revealed distant astronomical objects that were inplace when the universe was less than 1 billion years old. Nature of the universe during theperiod of a few hundred million year prior to that, however, remains largely unknown. It is
generally thought that the universe soon after the Big Bang had only simple elements such ashydrogen and helium as a form of gas with no luminous stars. This period is sometimes referred
to as “the cosmic dark age”. How the first stars formed from the cosmic primordial gas has beena burning question for years. Knowing the answers to these questions is so important because
their formations and eventual explosions provided the seeds for subsequent stars to come into
being.
Naoki Yoshida, together with Kazuyuki Omukai of National Astronomical observatory ofJapane and Lars Hernquist of Harvard-Smithsonian Center for Astrophysics, conducted a stateof-the-art computer simulation to study the formation of a proto-star which would eventuallyshine its light into this darkness.
Their simulations use the initial condition determined cosmologically and by now wellestablished constituting the standard model of the universe. All other important basic physics
such as gravitation, hydrodynamics, and atomic and molecular processes in a hydrogen-heliumgas are well understood. The simulation follows these processes rigorously. Other complications
that plague investigations of star formation in the local universe, such as the presence of strong
magnetic fields or heavy elements, can be neglected at these early times. The simulation covers
a dynamic range of 1013, from a fraction of solar raduius (1010cm) to cosmological volume
of hundreds of kiloparsecs (1023cm). According to the standard model of the universe, theenergy density is dominated by dark energy and cold dark matter. The simulation follows thegravitational collapse of dark matter.
They followed the evolution of dark matter and gas in a cube 200 comoving kiloparsecs
on a side. A gravitationally bound dark-matter halo that formed in the volume at an epoch
when the cosmological redshift was z = 14 is shown in Figure 10.

33

Protostar Formation in the Early Universe

IPMU ANNUAL REPORT 2008

Research Highlight
32

Inversely, by measuring this coherent pattern of background galaxy images, we can recover
the mass distribution in the cluster region in a model-independent way, which includes thecontribution of dark matter.
This lensing signal is weak, but extends out to the whole region of a cluster, thereby
providing a unique means of measuring the total matter distribution in the entire cluster
region. To measure these weak lensing distortion signals, we need (1) to use as many galaxies
as possible in order to extract the coherent shearing pattern of the images and (2) to measure
the shapes of galaxy images with high precision. In these senses, the Subaru Telescope with
8.2m primary mirror in diameter and at the summit of 4,200m Mt. Mauna in Hawaii is the best
instrument for measuring the weak lensing signals of galaxy clusters, thanks to its excellent
image quality and photon collecting power (i.e. delivering deep images or many galaxies to beanalyzed).
Masahiro Takada, together with a team of collaborators, has been carrying out asystematic study of cluster lensing by using the Subaru data. Figure 9 shows one example
of our study, showing the mass distribution reconstructed from the measurement of weakgravitational lensing effects on background galaxies for the cluster A1689. The color image
shows the Subaru imaging data, while the blue (thick) contours show the two-dimensional massdensity field reconstructed from the lensing measurement. Note that each contour is stepped by
the 1σ measurement error. It is clear that the mass density gets denser as one is approaching
to the cluster center, and indeed peaks near to the cluster center (the center is inferred from theposition of the brightest galaxy member).
The shape of mass distribution is not spherical and has an elongated structure, usuallymore elongated compared to the shape inferred from intracluster hot gas distribution observed
via the X-ray and Sunyaev-Zel’dovich effect (radio) measurements. On the other hand, the red
contours depict the distribution of member galaxies. The galaxy distribution appears to wellfollow the mass distribution. This agreement is much expected, because the member galaxies,
once formed, interact with other components only via gravity and behave like collision-lessparticles like dark matter. Also the detailed analysis shows that the amount of total matter

IPMU ANNUAL REPORT 2008

■ Figure 10: Projected gas distribution aroundthe protostar. (A) The large-scale gas distribution
around the cosmological halo (300 pc on a side).
(B) A self-gravitating, star-forming cloud (5 pc ona side). (C) The central part of the fully molecularcore (10 astronomical units on a side). (D) The
final protostar (25 solar radii on a side). The color
scale from light purple to dark red corresponds tologarithmically scaled hydrogen number densities
from 0.01 to 103cm-3 (A), from 10 to 106cm-3 (B),and from 1014 to 1019cm-3 (C). The color scale for(D) shows the density-weighted mean temperature,
which scales from 3000 to 12,000 K.

35

Astronomers at the Subaru Telescope went back in time and observed light from a “newstar” that originally was seen on 11 November 1572 by astronomer Tycho Brahe and others.
What Brahe observed as a bright star in the constellation Cassiopeia, outshining even Venus,
was actually a rare supernova event where the violent death of a star sends out an extremely
bright outburst of energy. He studied the brightness and color of the “new star” until March
1574 when it faded from view. The remains of this milestone event are seen today as Tycho’s
supernova remnant (Figure 11).
On 24 September 2008, using the Faint Object Camera and Spectrograph(FOCAS)
instrument at Subaru, the light echoes (Figure 12) were broken apart into the signatures ofatoms (spectra) present when Supernova 1572 exploded, bearing all the information about
the nature of the original blast. The results showed clear absorption of once-ionized silicon
and absence of the hydrogen H-alpha emission. The findings were very typical of a Type Ia
supernova (Figure 13).
During the study, the astronomers tested theories of the explosion mechanism and thenature of the supernova progenitor. For Type Ia supernovae, a white dwarf star in a close binary
system is the typical source, and as the gas of the companion star accumulates onto the whitedwarf, the white dwarf is progressively compressed, and eventually sets off a runaway nuclear
reaction inside that eventually leads to a cataclysmic supernova outburst. However, as Type Ia
supernovae with luminosity brighter/fainter than standard ones have been reported recently,
the understanding of the supernova outburst mechanism has come under debate. In order toexplain the diversity of the Type Ia supernovae, the team studied the outburst mechanisms indetail.
The comparisons with template spectra of Type Ia supernovae found outside our Galaxy
shows that Tycho’s supernova belongs to the majority class of Normal Type Ia, and, as such,is thought to be one of the best candidates for Type Ia in our galaxy. This finding is significant
because Type Ia supernovae are the primary source of heavy elements in the Universe, andResearch HighlightLight Echos of the 1572 Supernova■ Figure 11: Image of Tycho’s Supernova
Remnant: a color composite of various data. The
remnant is approximately 25 light-year in diameter.

IPMU ANNUAL REPORT 2008

Research Highlight34

The mass of this halo (500,000 solar masses, M) and the physical conditions within it are
particularly conducive for it to host a primordial star. The gas within this halo had a temperatureof 1000 K, and a small mass of hydrogen molecules ( 〜 10-4 in number fraction) had alreadyformed, enabling efficient radiation cooling. Through the action of radiative cooling, a starforming gas cloud collected in the host dark halo. The subsequent thermal and chemical
evolution of the primordial gas cloud were followed for more than 20 decades in density up to
the epoch of protostar formation.
The structure in and around the newly formed protostar was rather complex (Fig.10D).
At this time, there were substantial variations in density and temperature even in the innermost(10 solar radii) region. Clearly, the primordial protostar was not simply a sphere surrounded by asingle accretion shock.
Within a mass of 0.1 M, two spiral arms rotated rapidly; the outer part (0.05 to 0.1
M) appeared nearly centrifugally supported, whereas the central part had gravitationallycollapsed. The central core lost part of its angular momentum via gravitational torques exerted
by nonaxisymmetric perturbations. The newly born protostar was supported by both thermalpressure and rotation. The overall velocity structure was characteristic of a collapsing gas withan initially slow rotation.
The results show a complete picture of how a primordial protostar with a mass 1% that of
the Sun may have formed from tiny cosmological density fluctuations. If the gas surrounding theprotostar accreted efficiently, the protostar would quickly grow to be as massive as 10 M within
1000 years. A detailed protostellar calculation for a similarly large accretion rate predicts thatthe mass of the star when it lands on the main sequence will be 100 M. The model provides a
viable scenario for the early chemical enrichment in the universe by massive primordial stars,
which is necessary for the formation of later populations of ordinary stars.
Further reading: Science 1 August 2008: Vol 321. no. 5889, pp. 669-671

IPMU ANNUAL REPORT 2008

■ Figure 13: The spectrum of Tycho’s supernova(the horizontal axis is the rest wavelength andvertical axis is flux). Black solid lines show the
spectrum of Tycho’s SN1572. Comparison
with templates of subluminous, normal andoverluminous type Ia supernova (upper:
overluminous (blue), middle: normal (orange),bottom: subluminous (red)). The agreement
between the black and orange lines indicates that
the Tycho’s supernova belongs to the majority
class of normal Type Ia.

■ Figure 14: Geometry of F-theory compactificationis translated to differential equations that determine
massless-mode wavefunctions in the internal space. The
wavefunctions are used to calculate Yukawa couplings ofquarks and leptons. The differential equation contains a
potential term, and the potential varying over the internal
space is determined from the original geometry. This
figure shows behavior of the potential for the Higgs field(in the vertical axis) varying over the coordinates of theinternal space (in the two horizontal directions) near apoint where a D 5 singularity of the original geometry isenhanced to D 7. Practical calculation of the masslessmode wavefunctions is made much easier by reducing thisproblem to an easy problem in algebraic geometry, whichis to find holomorphic sections on a complex curve (blue inthe figure). There, we only need to use the information that
there are two red curves intersecting the blue curve at thepinch-point singularity.

Research Highlight

Interactions of all elementary particles are known to be described by the Standard
Model, which is a model of quantum field theory written in terms of various fields (such as
quarks and leptons) and about 30 parameters. Values of these parameters control strengthof forces and masses of various particles. Quantum field theories in general as a theoreticalframework, however, does not tell anything about what the values of those parameters should
be. Superstring theory, however, is a quantum theory that accommodates both gravity andfield theories of elementary particles, and may have more theoretical predictive powers thanquantum field theories in general.
Superstring theory is not fully understood yet, and is under intense investigation byscientists all over the world. Various formulations of superstring theory have been proposed,and “F-theory” is one of them. In F-theory, all the dynamical degrees of freedom (fields suchas quarks and leptons) originate from fluctuations of geometry, and it is crucial to understandthe precise relation between geometry and the degrees of freedom observed in physics, inorder to derive theoretical predictions of the parameters of the Standard Model. An algebraic
geometor Yukinobu Toda and a particle physicist Taizan Watari at IPMU cooperated to tackle
this problem, in collaboration with Hirotaka Hayashi (U. Tokyo), Radu Tatar (U. Liverpool) andMasahito Yamazaki (U. Tokyo). They employed a string duality to study F-theory, examined
structure of mathematical objects called “sheaves”, and succeeded in determining the precise
relation between geometric structures and various fields of the supersymmetric Standard Model(Fig.14) for the first time in the world. This study opened a new way to calculate values of theparameters of the Standard Model.
The string duality employed in this study is called Heterotic--F theory duality. It implies anequivalence between a quantum mechanical moduli space of a certain gauge theory and thatof a certain geometry. The duality itself is not yet understood very well, and was also a subjectof investigation. The joint collaboration of a mathematician and physicists also clarified various
aspects of this duality, which is also interesting from mathematical point of view.
Further reading: Nuclear Physics B806 (2009) 224

37

36■ Figure 12: The light echoes from Tycho’s
supernova. The optical light (blue) arrived at Earthin 1572. Optical light (yellow) was scattered by dust
cloud around the supernova and arrived at Earth in2008. Since the emitting regions were apparently
shifted from 23 August 2008 to September 24,
the optical lights (yellow) were confirmed as lightechoes.

Heterotic F-Theory

IPMU ANNUAL REPORT 2008

Research Highlightplay an important role as cosmological distance indicators, serving as standard candles becauseof constant luminosity at the peak of their light curve. In addition, the team discovered that
Supernova 1572 shows a hint of an aspherical/nonsymmetrical explosion, which, in turn, could
put limits on explosion models for future studies.
This observational study at Subaru established how light echoes can be used in a
spectroscopic manner to study supernovae outburst that occurred hundreds of years ago. The
light echoes, when observed at different position angles from the source, enabled the team tolook at the supernova in a three dimensional view. For the future, this 3D aspect will accelerate
the study of the outburst mechanism of supernova based on their spatial structure, which, todate, has been impossible with distant supernovae in galaxies outside the Milky Way.
The research was conducted by the team of IPMU (lead by Ken’ichi Nomoto), NAOJ and
Max-Planck Institute.
Further reading: Nature 4 December: Vol. 456. pp. 617-619

■ Figure 16: Shigeki Sugimoto was a co-recipients of the 2008 Toshiei Kimura
theoretical physics Prize of Yukawa Foundation. It was shared with Tadakatsu Sakai
of Ibaraki University. They developed an analysis technique “holographic quantum
chromodynamics model based on gauge superstring theory/gravity correspondence”
of strong interaction using superstring theory. This prize is given to those who madesignificant contribution in the area of gravity/space-time theory, field theory and relatedarea in fundamental theoretical research, and are expected to continue to take leadingrole in the fields.

■ Figure 20: Kunio Inoue received the 2008 JSPS Prize for his contribution on“Precision Measurement of Reactor Neutrino Oscillations”. He has been a leaderof KamLand project for detecting anti-neutrinos generated from the power reactors,
successfully leading to the world highest precision determination of the massdifference between different types of neutrinos. Inoue has also been pioneering the
research for detecting neutrinos from inside the earth.

■ Figure 17: Masahiro Takada received the Astronomical Society of Japan Young
Astronomer Award for his work on the dark matter. He has developed a theoreticalmethod to probe dark matter using the gravitational lensing phenomenon predicted
by Einstein’s general theory of relativity. Takada has also led observations using the
Hubble Space Telescope and the Subaru Telescope, and has successfully identified
the distribution of the dark matter.

Research Highlight■ Figure 19: Masayuki Nakahata received the 25th Inoue Prize for Science for his
contribution on “Observation of solar neutrinos and their oscillations”. He has been asenior member of the Kamiokande and Super-Kamiokande experiments.

39

Research Highlight38■ Figure 15: The American Mathematics Society awarded the inaugural Leonard
Eisenbud Prize to Hirosi Ooguri (IPMU/Caltech), Andrew Strominger and Cumrun
Vafa (Harvard) in January 2008. The AMS Eisenbud Prize was established in 2008 tohonor works that strengthen the connection between mathematics and physics, oncein every three years. Ooguri, Strominger, and Vafa used string theory and the forefrontof high-dimensional geometry to study properties of small blackholes that are beyond
the reach of Hawking’s theory. Ooguri was also a recipient of the 2008 Humboldt
Research Award for his work in developing a mathematical method in quantum field
theory and string theory.

IPMU ANNUAL REPORT 2008

IPMU ANNUAL REPORT 2008

■ Figure 18: Naoki Yoshida received the International Union of Pure and Applied
Physics (IUPAP) Young Scientist Prize in Computational Physics for his state-of-theart computer simulation study on the large-scale structure of the universe.

7. Seminars

Research Highlight

Oct 30, Shigeki Sugimoto, IPMU
“String theory and QCD”
Dec 10, Dmitry Kaledin, Steklov Math Inst/Univ. Tokyo“Deligne conjecture and the Drinfeld double”
Jan 8, Takada Masahito, Tohoku Univ.
“Gravitational lensing and dark matter and darkenergy”
Jan 9, Naoki Yoshida, Nagoya Univ.
“Structure Formation in the Early Universe”
Jan 10, Tadashi Takayanagi, Kyoto Univ.
“Holography and Entanglement Entropy”

40

Jan 16, Matthew Buckley, Berkeley/IPMU“Discriminating spin through quantum
interference”
Jan 28, Jim Gunn, Princeton“BOSS”

IPMU ANNUAL REPORT 2008

Feb 1, Jenny Greene, Princeton Univ.
“The Mass Function of Local Active Black Holes”

Feb 22, Werner Porod, Wuerzburg Univ.
“Testing supersymmetric neutrino mass models at
future collider experiments”
Feb 27, Masaki Tsukamoto, Kyoto Univ.
“Deformation of Brody curves and meandimension”
Feb 28, Alexandre Kozlov, Tohoku Univ.
“Neutrino physics program at KamLand”
Mar 5, Keiichi Maeda, IPMU
“Hunting for the Geometry of Supernova
Explosions by Optical/NIR Observations”

Seminars

Oct 29, Hiroshige Kajiura, RIMS Kyoto Univ.
“Some examples of triangulated and/or A ∞-categories related to homological mirror
symmetry”

Feb 21, David Poland, UC Berkeley“More visible effects of the hidden sector”

Mar 10, Shing-Tung Yau, Harvard Univ.
“Geometric analysis and their applications inmathematics and theoretical physics”
Mar 14, Damien A. Easson, Univ. Durham“Cosmology from spinning branes”

JFY2008
Apr 4, Yen-Ting Lin, Princeton Univ.
“Ensemble properties of cluster galaxies and theirredshift evolution”

41

Oct 15, Shinobu Hosono, Univ. Tokyo“Topics on string theory, mirror symmetry, andGromov-Witten invariants”

Feb 20, Mohab Abou Zeid, KEK“Gauge Theory, Gravity and Twistor String
Scattering Amplitudes”

Apr 8, 15, 22, May 13, Akihiro Tsuchiya, IPMU
“Lecture: Homotopy theory (before 1970)”

Feb 1, Mariska Kriek, Princeton Univ.
“AGNs and suppressed star formation in massive
galaxies at z 2.5”

Apr 9, Simeon Hellerman, IAS“Cosmological Unification of String Theories”

Feb 6, Hiroyuki Abe, YITP
“Moduli stabilization, F-term uplifting andsequestering in supergravity models”

Apr 11, Shin’ichiro Ando, Caltech“Astrophysical Probe of New Physics: Cosmological
Dark Matter and Anisotropy”

Feb 12, Katrin Wendland, Augsburg Univ.
“How to lift a construction by Hiroshi Inose toconformal field theory”

Apr 16, Jose M Figueroa-O’Farrill, Univ. Edinburgh“Killing superalgebras in supergravity”

Feb 13, Koichi Hamaguchi, Univ. Tokyo“Ultralight Gravitino at the LHC”

Apr 23, Motohico Mulase, UC Davis“Integrable systems and intersection theory on
moduli spaces of Riemann surfaces”

Feb 14, Yuki Shimizu, Waseda Univ.
“Direct and Indirect Dark Matter SearchExperiment”

Apr 23, Chuan-Ren Chen, IPMU
“Direct and Indirect search for signals of the
Littlest Higgs model with T-parity at Colliders”

Feb 19, Mark Vagins, UC Irvine“GADZOOKS! A Potential Super-Kamiokande
Upgrade”

Apr 24, Motohico Mulase, UC Davis“Recursion relations in intersection theory on themoduli spaces of Riemann surfaces”

IPMU ANNUAL REPORT 2008

JFY2007

Jul 17, Kyoji Saito, IPMU“Partition functions for non-commutative lattices”

Aug 22, Yeong-Gyun Kim, KAIST“Mass and Spin at LHC”

Jul 18, Jie Xiao, Fan Xu, Tsinghua Univ.
“Drived Hall algebra II”

Aug 28, Andrei Frolov, Simon Fraser U“A Singularity Problem with f(R) Dark Energy”

Jul 21, Jie Xiao, Fan Xu, Tsinghua Univ.
“Drived Hall algebra III”

Sep 3, Yasuaki Hikida, KEK“The FZZ-Duality Conjecture - A Proof”

Jul 22, Latham Boyle, Canadian Inst Theo Astr (CITA)“Testing inflation: gravitational waves, consistency
conditions, and bootstrap relations”

Sep 9, Mitsuru Kakizaki, Bonn U“Abundance of Thermal Relics in Non-standard
Cosmological Scenarios”

Jul 23, Latham Boyle, CITA
“Binary black hole merger: symmetry and the spin
expansion”

Sep 10, Atish Dabholkar, U Pari 6“Black Hole Entropy in String Theory - A Window
into the quantum Structure of Spacetime -”Jul 24, Jie Xiao, Fan Xu, Tsinghua Univ.
“Lie Algebras Associated with Derived Categories I”

Sep 10, Kai Wang, IPMU
“Testing origin of neutrino mass at the LHC”

Jul 24, Michael Strauss, Princeton Univ.
“Quasars from z=0 to z=6: Demographics andClustering as Clues to their Physical Nature”

Sep 17, Jing Shu, IPMU
“Topological Interactions at the LHC andGeneralized Landau-Yang Theorem”

Jun 25, Andrei Mikhailov, Caltech“String theory and Maillet formalism”

Jul 28, Jie Xiao, Fan Xu, Tsinghua Univ.
“Lie Algebras Associated with Derived Categories
II”

Sep 18, Brian Powell, IPMU
“What we know (and may ever know) about
inflation”

May 29, Masahito Yamazaki, Univ. Tokyo“Quivers, brane tilings and toric Calabi-Yau/SasakiEinstein geometry”

Jun 26, Shigeki Matsumoto, Toyama Univ.
“Weak Scale Gravitino Dark Matter”

Jul 28, Lin Weng, Kyushu Univ.
“Symmetries and the Riemann Hypothesis”

Sep 18, Shunji Matsuura, U Tokyo/Perimeter Inst
“Holographic non-local operators”

Jun 2, Shinobu Hikami, Univ. Tokyo“Intersection theory from duality and replica”

Jun 26, Andrei Mikhailov, Caltech“String theory and Maillet formalism”

Jul 29, Jie Xiao, Fan Xu, Tsinghua Univ.
“Lie Algebras Associated with Derived Categories
III”

Sep 19, Shin Nakamura, CQUeST, Sogang U“A Holographic Dual of Bjorken Flow”

Jun 4, Yukiko Konishi, Kyoto Univ.
“On solutions to Walcher’s extended holomorphic
anomaly equation”

Jun 30, J. Manuel Garcia-Islas, Mexico“Quantum topological invariants and black holeentropy”

Jun 5, Kentaro Hori, Univ. Toronto“Phases of N=2 theories in 1+1 dimensions withboundary Part II”

Jul 2, Kentaro Nagamine, Univ. Nevada“Galaxy Formation through Cosmic Time using
Cosmological Hydrodynamic Simulations:
successes and current issues”

Jul 31, Akihiro Tsuchiya, IPMU
“Vertex Operator Algebra with C2-finite conditionsand Logarithmic Conformal Field Theory”

Sep 25, Simon Dedeo, U Chicago“The View from U Chicago”

Jul 3, Yuji Sano, IPMU
“On multiplier ideal sheaves on toric Fano
manifolds”

Aug 4, Kentaro Nagao, Kyoto Univ.
“Counting invariants of perverse coherent systems
on CY 3-folds and their wall-crossings”

Oct 01, Cosimo Bambi, IPMU
“A possible observational signature of the weightof vacuum energy”

Jul 10, Shiou Kawagoe, Univ. Tokyo“Neutrino oscillations in non-spherical supernova”

Aug 11, Shushi Harashita, IPMU
“Introduction to Deligen-Lusztig theory”

Oct 02, Sven Bjarke Gudnason, U Pisa
“SO and USp Kähler and HyperKähler Quotientsand Lumps”

Jul 14, Jie Xiao, Fan Xu, Tsinghua Univ.
“Drived Hall algebra I”

Aug 13, Michael Kiermaier, MIT“One-Loop Riemann Surfaces in Schnabl Gauge”

Jul 16, Kazuhiro Sakai, Keio Univ.
“AdS/CFT correspondence and Integrable systems”

Aug 18, Hisanori Furusawa, NAOJ
“Applications of wide and deep multi-waveband
imaging in the extragalactic astronomy: SuprimeCam to HSC”

Jun 13, Eiichiro Komatsu, Univ. Texas“Hunting for Primordial Non-Gaussianity”

May 12, Kai Martens, Univ. Utah
“Cosmogenic Neutrinos and the HiRes experiment”

Jun 18, Andy Neitzke, Princeton Univ.
“Crossing the wall: overcoming an Obstruction in
Quantum Field Theory and String Theory”

May 12, Jean-Michel Bismut, Univ. Paris-Sud, Orsay“The hypoelliptic Laplacian”

Seminars

May 14, Alexey Bondal, Univ. Aberdeen“Derived categories in Noncommutative Geometry”
May 19, Jean-Michel Bismut, Univ. Paris-Sud, Orsay“A survey of Quillen metrics”
May 21, Kazushi Ueda, Osaka Univ.
“Toric degenerations of Gelfand-Cetlin systems
and potential functions”
May 28, Yasuaki Hikida, KEK“H3+ Liouville relation and its applications”

42

May 29, Nobuchika Okada, KEK“Higgs boson mass bounds in the Standard Modelwith seesaw-induced neutrino masses”

Jun 9, Alejandro Ibarra, DESY
“Indirect Signatures of Gravitino Dark Matter”
Jun 9, Michael Douglas, Rutgers Univ.
“String compactification and the landscape”

IPMU ANNUAL REPORT 2008

Jun 10, Michael Douglas, Rutgers Univ.
“Balanced Kahler metrics and physics”
Jun 11, Eiichiro Komatsu, Univ. Texas“The 5-Year Wilkinson Microwave Anisotropy
Probe (WMAP) Observations: CosmologicalInterpretation”

Jun 19, Andy Neitzke, Princeton Univ.
“BPS Wall-crossing and Hyperkahler Geometry”
Jun 19, Sakura Schafer-Nameki, Caltech“Planar Ads/CFT: wrapping it up”
Jun 20, H. Murayama, IPMU
“IPMU, Mathematics, Physics, and me”
Jun 24, Massimo Passera, INFN“The muon g-2 and the bounds on the Higgs
boson mass”
Jun 25, J. Manuel Garcia-Islas, Mexico“Spin foam models of quantum gravity”

Jul 30, Satoshi Kondo, IPMU
“On a Drinfeld modular analogue of Beilinson’sconjecture”

Sep 22, Antonio Enea Romano, YITP
“Effects of particle production during inflation”
Sep 24, Simon Dedeo, U Chicago“The Phenomenology of Gravity”

Oct 02, George Hou, NTU“CP Violation for the Heaven and the Earth”
Oct 07, Doron Lemze, Tel Aviv
“Combining Lensing, X-ray, and galaxy dynamic
Measurements in Clusters”

IPMU ANNUAL REPORT 2008

May 8, Yukinobu Toda, IPMU
“Limit stable objects on Calabi-Yau 3-folds”

Seminars

Aug 21, David M. Goldberg, Drexel U“Where is the Information in Cluster Lenses?”Jun 12, Shushi Harashita, IPMU
“Generic Newton polygons of Ekedahl-Oort strata
in the moduli space of abelian varieties”

43

Jul 17, Kenji Kadota, Univ. Minnesota“Cosmology in warped extra dimensions”

Apr 30, Kentaro Hori, Univ. Toronto“Phases of N=2 theories in 1+1 dimensions withboundary”

Nov 6, Simeon Hellerman, IPMU
“Cosmological unification of string theories”

Oct 10, Tom Broadhurst, Tel Aviv
“Testing LCDM with Subaru Observations ofCluster Mass Profiles”

Nov 10, Shirley Ho, Princeton“What can you do with Cosmic Microwave
Background as a Backlight?”

Oct 14, Akihiro Tsuchiya, IPMU
“Conformal field theory and vertex operator
algebras”

Nov 10, Kazuya Koyama, Portsmouth“Modified gravity as an alternative to dark energy”

Oct 14, Johan Alwall, SLAC
“Matching QCD radiation in gluino and squark
production at the LHC”
Oct 14, Maxim Kontsevich, IHES
“Wall Crossing”
Oct 15, Kaoru Hagiwara, KEK“Jet angular correlation in vector-boson fusion
processes at hadron colliders”

44

Oct 16, Domenico Orland, IPMU
“Quantum Crystals and Topological Strings”
Oct 22, Thierry Foglizzo, Service d’Astrophysique/
Waseda“From the whistle of a kettle to the asymmetric
explosion of supernovae”
Oct 22, David Berenstein, U California, Santa Barbara“A new dimension for the AdS/CFT
correspondence”
Oct 23, Alex Kusenko, UCLA
“Echoes of supersymmetry from the early universe:
baryons, dark matter, and gravitational waves”
Oct 27, Michael Semenov-Tian-Shansk, U Bourgogne“Poisson groups and differential Galois theory of
Schroedinger equation on the circle”
Oct 27, Anatoli Kirillov, RIMS Kyoto“Dunkl operators and quadratic algebras”
Oct 29, Shigeki Sugimoto, IPMU
“Properties of Baryons in Holographic QCD”

IPMU ANNUAL REPORT 2008

Oct 30, Hiromitsu Takahashi, GLAST“The Fermi Gamma-ray Space Telescope”
Nov 5, Sergey Gorchinskiy, Steklov Math Inst
“Conjectures on motives: case of simple threefolds”
Nov 5, Lawrence Hall, UC Berkeley“Predictions from the Multiverse”

Nov 17, David Morrison, UCSB“Open strings and noncommutatie algebraic
geometry”
Nov 19, Pisin Chen, NTU/Stanford“The Dark Energy Puzzle”
Nov 20, Joe Conlon, Oxford“Hierarchy Problems in String Theory: An Overview
of the LARGE Volume Scenario”
Nov 20, Nicolai Reshetikhin, UC Berkeley/Amsterdam“Quantum groups at roots of unity and invariantsof links”
Nov 27, Seiji Terashima, YITP
“Toward a Proof of Montonen-Olive Duality via
Multiple M2-branes”
Nov 28, Mikael Pichot, IPMU
“Groups of intermediate rank”
Dec 1, Kentaro Hori, U Toronto/IPMU“A pair of non-birational but derived equivalentCalabi-Yau manifolds from non-Abelian gauge
theories”

Dec 18, Nakwoo Kim, Kyung Hee U“On the geometry of supersymmetric AdS
solutions”
Dec 24, Yuji Tachikawa, IAS“New Developments in d=4, N=2 Superconformal
Field Theories”
Dec 24, Amihay Hanany, Imperial College“Brane Tilings and M2 branes”
Jan 5, Seiji Kawamura, NAOJ
“Journey Toward Gravitational Wave Astronomy”
Jan 7, Henk Hoekstra, Leiden“Weak Lensing by large scale structure”
Jan 8, Kiwoon Choi, KAIST“MT2-assisted on-shell reconstruction of missing
momenta and application to spin measurement at
the LHC”
Jan 8, Yu Nakayama, UC Berkeley“An Index for Non-relativistic Superconformal Field
Theories”
Jan 9, Dmitry Kaledin, Steklov Math Inst
“Fedosov quantization in algebraic andholomorphic setting”
Jan 15, Haibo Yu, UC Irvine“Hidden Charged Dark Matter and Its Relics”
Jan 15, Jan Zaanen, Leiden“Planckian dissipation”

Dec 3, Yuji Okawa, U Tokyo“The boundary state from open string fields”

Jan 16, Kenneth Shackleton, IPMU
“On Harvey’s curve complex”

Dec 11, Manabu Akaho, Tokyo Met U“Immersed Lagrangian Floer theory”

Jan 22, Masamune Oguri, Stanford“The SDSS Quasar Lens Search and its use as adark energy probe”

Dec 15, Hiro Tajima, SLAC
“Science and Instrumentation of ASTRO-H Mission:
Next Generation X-ray/Gamma-ray Satellite
Mission”
Dec 16, Alexie Leauthaud, LBL“Halo properties of Groups and Clusters via Weak
Gravitational Lensing in COSMOS”
Dec 16, Kevin Bundy, UC Berkeley“The Mass-Dependent Role of Mergers in Galaxy
Evolution”

Jan 22, Ryo Ookawa, Titech“Moduli of Bridgeland semistable objects on the
projective plane”

Feb 4, Robert Emparan, ICREA & Barcelona“Black Holes and Blackfolds in Higher Dimensions”
Feb 5, Jiayu Tang, IPMU
“Complementarity of Future Dark Energy Probes”
Feb 5, Daniel Sternheimer, Keio U“The deformation philosophy of quantization,
singleton physics and noncommutative analoguesof space-time structures”
Feb 9, Hideki Maeda, Centro de Estudios Cientificos“Self-similar growth of black holes in theFriedmann universe”
Feb 9, Robert Brandenberger, McGill“String Theory and the Very Early Universe”
Feb 11, Masahiro Ibe, SLAC
“R-axion: A new physics signature involving muonpairs”

Seminars

Oct 09, Shima Shimizu, ZEUS
“Results on the proton structure from HERA”

Dec 18, Kazunori Kohri, Lancaster“Big-Bang nucleosyntheis and a hint to solve
problems in astrophysics, cosmology and particle
physics”

Feb 12, Yifang Wang, IHEP
“Reactor neutrino experiments and future
prospects”
Feb 16, Sergei Blinnikov, ITEP“Supernova light”
Feb 18, Frank Daniel Steffen, Max Planck Inst
“Supersymmetric Dark Matter in Cosmology and at
Colliders”

45

Nov 6, Chun-Lin Shan, Seoul N U“Identifying Weakly Interacting Massive Particles
from Direct Dark Matter Detection Data”

Feb 19, Shouhei Ma, U Tokyo“0-dimensional cusps of the Kahler moduli of a K3
surface”
Feb 24, A.G. de Bruyn, ASTRON, Dwingeloo andKapteyn Institute, Groningen“LOFAR - a major new low frequency observatory:
science drivers, challenges and some pilot facility
results”
Feb 24, Saleem Zaroubi, Kapteyn AstronomicalInstitute, Groningen“Probing the End of the Universe’s Dark Ages with
LOFAR”
Feb 25, Ashley J. Ruiter, New Mexico State U“Double Compact Object Binaries”

Jan 23, Amaya Moro-Martin, Princeton“Debris Disks”

Feb 26, Federico Urban, UBC“The cosmological constant as a manifestation of
the conformal anomaly”

Jan 27, Andrea Ferrara, Scuola Normale Superiore,
Pisa“The First Billion Years”

Feb 26, Wei Li, IPMU
“Three Stringy Realizations of Fractional Quantum
Hall Effect”

Jan 29, Tatsuma Nishioka, Kyoto U“CFT Duals for Extreme Black Holes”

Feb 27, Niayesh Afshordi, Perimeter Inst
“The end of the cosmological constant problem!”

IPMU ANNUAL REPORT 2008

Seminars

Oct 08, Takaya Nozawa, IPMU
“Formation of dust in primordial supernovae andits survival within the supernova remnants”

8. Conferences
Mar 2, Stavros Katsanevas, Paris“A roadmap to the stars: towards a global strategy
for astroparticle”
Mar 4, Simon Glover, Heidelberg U“The stellar initial mass function in low metallicity
gas”

Seminars

Mar 5, C.P. Yuan, Michigan State U“Precision Measurements at Hadron Colliders”
Mar 5, Tetsuji Kimura, YITP“AdS Vacua, Attractor Mechanism and Generalized
Geometries”
Mar 12, Andreas Karch, Washington U“A holographic perspective on non-relativistic
defects”

JFY2007

Mar 19, Hiroyuki Nakaoka, U Tokyo“Introduction to the 2-categorical homologicalalgebra”

Mar 11 - 12,2008
IPMU Opening Symposium

Mar 24, Geoffry Schrank, U Utah
“Dynamics of Hyperpolarized 129Xe Production”
Mar 24, Jing Liu, Max Planck Inst
“Development of segmented germanium detectors
for neutrinoless double beta decay experiments”
Mar 25, Seong Chan Park, PMU“Splitting Kaluza-Klein spectrum and its
phenomenology”
Mar 26, Neil Turok, Perimeter Inst
“Quantum Resolution of CosmologicalSingularities”

Mar 17 - 21
Focus Week: Neutrino Mass
Mar 20 - 22
Asian mathematicians and theoretical physicists

JFY2008

September 16-18
A Workshop on Micro-local analysis on symplectic
manifolds
November 17-21
Focus Week: Messengers of Supernova Explosions
January 4-9, 2009
Supersymmetry in Complex Geometry
March 16-20
Focus Week: Determination of Masses and Spins of
New Particles at the LHC

47■ Figure 21: John Conway (right) andJohn McKay (left) on the occasion of
the Moonshiney Workshop at IPMU.

IPMU ANNUAL REPORT 2008

May 22 - 24
Moonshiney Conference in Kashiwa

September 12-16
Focus Week: Quantum Black Holes46

Mar 26, Simeon Hellerman, IPMU
“The Strong Gravity Theorem”

Dec 17 - 21, 2007
Focus week: LHC Phenomenology

June 23-27
Focus Week: LHC physics

IPMU ANNUAL REPORT 2008

Mar 16, Kouichi Hirotani, Nat’l Tsing Hua U, Taiwan“Pulsars: excellent systems for testing particle
acceleration theories”

Mar 18, Pierre-Simon Mangeard, CPPM, Marseille“In situ commissioning of the ATLAS
electromagnetic calorimeter and early Z’ to ee
discovery potential”

Conferences

Feb 27, Ghazal Geshnizjani, Perimeter Inst
“Observational Evidence for Cosmological-Scale
Extra Dimensions”

9. Conference Talks

ICRR Theory Group Workshop(2007.12.10 - 11, ICRR, Japan)
Fuminobu Takahashi“Inflaton decay in supergravity and the new
gravitino problem”
Workshop on Early Universe Thermometers(2008.2.06 - 08, Padova, Italy)
Hitoshi Murayama“Models of Dark Matter”

48

Joint Asian Committee for Future Accelerators Physics
and Detector Workshop and Global Design Effort
meeting on International Linear Collider (TILC08)(2008.03.03 - 06, Sendai, Japan)
Hitoshi Murayama“ILC, Future Particle Physics and Cosmology”
The 4th International Workshop on Nuclear andParticle Physics at J-PARC (NP08)(2008.03.05 - 07, Mito, Japan)
Hitoshi Murayama“Prospects for Particle Physics”
Focus week on neutrino mass
(2008.03.17 - 20, IPMU, Kashiwa, Japan)
Hitoshi Murayama“Neutrino Oscillation Phenomenology”
KEK Cosmo Group Inaugural Conference: Acceleratorsin the Universe(2008.03.12 - 14, KEK, Japan)
Fuminobu Takahashi“Gravitino and Inflation”

IPMU ANNUAL REPORT 2008

30 Years of Mathematical Methods in High Energy
Physics(2008.03.17 - 19, YITP, Kyoto U, Japan)
Hirosi Ooguri“New Anomalies in Topological String Theory”

JFY2008
The 6th DECIGO Workshop(2008.04.16, NAOJ, Japan)
Fuminobu Takahashi“Gravity waves as a probe of the gravitino mass”

RIKEN Nishina Center Physics Colloquium(2008.05.13, Wako, Japan)
Hitoshi Murayama“The Next Twenty Years in Particle Physics”
Japan-France Joint Workshop on Cosmology of the
Early Universe(2008.05.14, Nikko, Japan )Shinji Mukohyama“Brane inflation in string cosmology”
Fuminobu Takahashi“The Anthropic Solution to the Strong CP problem”

Conference Talks

Conferences

Progress of Quantum Field Theory and String Theory(2007.12.07 - 10, Osaka City U, Osaka, Japan)
Hirosi Ooguri“Meta-stable vacua in perturbed Seiberg-Witten
theory, revisited”

UC Riverside Physics Colloquium(2008.05.01, Riverside, USA)
Hitoshi Murayama“Big World of Little Neutrinos”

University of Tokyo Colloquium(2008.05.16, Tokyo, Japan)
Hitoshi Murayama“Quantum Universe”
Continuous Advances in QCD (CAQCD08)(2008.05.15 - 18, U Minnesota, Minneapolis, USA)
Shigeki Sugimoto“Properties of Baryons from D-branes andInstantons”

49

East Asian Conference on Algebraic Topology(2007.11.05, SNU, Seoul, Korea)
Toshitake Kohno“Loop spaces of configuration spaces and link
homotopy invariants”

Korean Physics Society Meeting(2008.04.17, Daejeon, Korea)
Masahiro Takada“Gravitational Lensing and Dark Matter and Dark
Energy”

Caltech Annual Seminar Day(2008.05.17, Pasadena, USA)
Hirosi Ooguri“Black Holes and the Fate of Determinism”
Cosmology Near and Far: Science with WFMOS(2008.05.19 - 21, Kona, Hawaii, USA)
Masahiro Takada“Cosmological limits on neutrino mass”
QUARKS 2008
(2008.05.23 - 29, Sergiev Posad, Russia)
Alexandre Kozlov“KamLAND results and prospects”
Shinji Mukohyama“Brane inflation in string cosmology”
32nd Johns Hopkins Workshop “Perspectives in String
Theory”(2008.05.28 - 31, SNU, Seoul, Korea)
Shigeki Sugimoto“Perspectives in Holographic QCD”
String Phenomenology 2008
(2008.05.29, U Penn, Philadelphia, USA)
Taizan Watari“Heterotic--F Theory Duality Revisited”

IPMU ANNUAL REPORT 2008

JFY2007

The 10th International Workshop on Neutrino
Factories, Superbeams and Betabeams (NuFact08)(2008.06.30 - 07.05, Valencia, Spain)
Hitoshi Murayama“Neutrinos in the Standard Model and Beyond”

Melbourne Neutrino Theory Workshop(2008.06.02 - 04, Melbourne, Australia)
Hitoshi Murayama“Can we experimentally test seesaw and
leptogenesis?”
Non-Perturbative Methods in Strongly Coupled Gauge
Theories(2008.06.09 - 27, Florence, Italy)
Shigeki Sugimoto“Static Properties and Form Factors of Baryons in
Holographic QCD”

50

Braids, Knots and Applications(2008.06.10, Univ. de Montpellier, France)
Toshitake Kohno“Braids, Drinfel’d associator and rational
homotopy”
SUSY08 Pre-school Lectures at Korean Institute forAdvanced Study(2008.06.12 - 14, Seoul, Korea)
Hitoshi Murayama“Supersymmetry”
The 16th International Conference on Supersymmetry
and the Unification of Fundamental Interactions(SUSY08)(2008.06.16 - 21, Seoul, Korea)
Hitoshi Murayama“Gauge Mediation Made Viable and Generic”
Fuminobu Takahashi“Non-Gaussianity from Symmetry”

IPMU ANNUAL REPORT 2008

Takagi Lectures, Mathematical Society of Japan(2008.06.21, Kyoto, Japan)
Hirosi Ooguri“Geometry as seen by String Theory”
The 10th Anniversary Symposium of Research Center
for Neutrino Science(2008.06.21, Sendai, Japan)
Hitoshi Murayama“Impact of the KamLAND Experiment”
Modified Gravity on Cosmological Scales(2008.06.23, ICG, Portsmouth, UK)
Shinji Mukohyama“Gravity in Higgs phase”

Aspen Center for Physics, Center Colloquium(2008.07.17, Aspen, USA)
Hirosi Ooguri“Searching for the Language of Quantum Gravity:
Black Holes, Molten Crystals and TopologicalTwist”
The 13th Advanced Accelerator Concepts Workshop(2008.07.27 - 08.02, USA)
Hitoshi Murayama“The Physics beyond the LHC”
Cosmology with the CMB and LSS(2008.07.21 - 08.31, Inter University Centre for
Astronomy and Astrophysics (IUCAA), Pune, India)
Masahiro Takada“Neutrinos and Cosmology (lecture)”
The 10th Asia-Pacific International Astronomical Union
Reagional Meeting(2008.08.03 - 07, Kunming, China)
Masahiro Takada“Gravitational Lensing and Observational
Cosmology”
Summer Institute 2008
(2008.08.06, Fuji-Yoshida, Japan)
Shinji Mukohyama“Dynamical Black hole as a holographic dual of
Bjorken Flow”
Summer Institute in Phenomenology of Particle Physics(2008.08.10-17, Chi-Tou, Taiwan)
Hitoshi Murayama“From Colliders to the Universe”
Summer School of Young Nuclear and Particle Physicist
Group of Japan(2008.08.19, Tokyo, Japan)
Hitoshi Murayama“Quantum Universe”
Strings 2008
(2008.08.18 - 23, CERN, Switzerland)
Hirosi Ooguri“Summary Talk”
Conference in Honour of Peter Orlik(2008.08.21, Toronto, Canada)
Toshitake Kohno“Bar Complex of Orlik-Solomon algebra andrational universal holonomy maps”

New Vision 400(2008.10.12, Beijing, China)
Naoki Yoshida“The First Stars”

Cosmo08(2008.08.25 - 29, Madison, USA)
Hitoshi Murayama“Reconciling supersymmetry and leptogenesis”

Workshop on Underground Detectors Investigating
Grand Unification (UDiG)(2008.10.16 - 17, Brookhaven National Laboratory,
New York, USA)
Hitoshi Murayama“Studying the Universe Underground”

Cosmic Dust - Near & Far(2008.09.08 - 12, Heidelberg, Germany)
Takaya Nozawa“Origin and Nature of Dust in the Early Universe”

APS Division of Nuclear Physics Annual Meeting(2008.10.19 - 20, Oakland, USA)
Hitoshi Murayama“Studying the Universe Underground”

International Workshop on Next Nucleon decay and
Neutrino detectors (NNN08)(2008.09.11 - 13, Paris, France)
Alexandre Kozlov“KamLAND general talk”
Mark Vagins“GADZOOKS!”
Hitoshi Murayama“Neutrino and proton decay: What can we learn
for fundamental physics and cosmology”

Going Beyond the SM, Marching into the LHC era(2008.10.20 - 24, Kavli Inst Beijing, China)
Kai Wang“Testing Origin of Neutrino Mass at the LHC”

Focus Week on Quantum Black Holes(2008.09.12 - 16, IPMU, Japan)
Tadashi Takayanagi“Fuzzy Ring from M2-brane Giant Torus”

Cosmology and Structure Formation(2008.10.26 - 28, Seoul, Korea)
Masahiro Takada“The impact of finite-mass neutrinos on nonlinear
matter power spectrum”
Naoki Yoshida“Formation of Primordial Stars”

Maria Laach Summer school(2008.09.08 - 13, Maria Laach, Germany)
Hitoshi Murayama“Particle Physics”
Neutrino Physics and Astrophysics(2008.09.17 - 21, Beijing, China)
Hitoshi Murayama“Theoretical overview of neutrino physics”
Recent Developments in String/M Theory(2008.09.22 - 26, KIAS, Korea)
Tadashi Takayanagi“Entanglement Entropy and Phase Transition in
AdS/CFT Correspondence”
European Priorities in Astroparticle Physics(2008.09.29 - 30, Brussels, Belgium)
Hitoshi Murayama“Japanese priorities”
Intelligence of Low Dimensional Topology 2008
(2008.10.08, Osaka City U, Japan)
Toshitake Kohno“Braids, local system homology and KZ
connection”

Conference Talks

Kavli Institute for Theoretical Physics Conference“Anticipating Physics at the LHC”
(2008.06.02 - 06, Santa Barbara, USA)
Hitoshi Murayama“Deciphering New Physics Through Spin
Measurement Using Quantum Interference”

Summer Institute “Theories de jauge, gravite ettheories de cordes”(2008.08.25 - 09.05, Ecole Normale Superieure, Paris,
France)Shigeki Sugimoto“Baryons in Holographic QCD”

Von Neumann Algebras and Ergodic Theory of Group
Actions(2008.10.26 - 11.01, Oberwolfach, Germany)
Mikael Pichot“Groups of intermediate rank”

51

Eurostrings 2008
(2008.06.30 - 07.04, Amsterdam, Holland)
Hirosi Ooguri“Current Correlators for General Gauge Mediation”

The 9th International Committee for Future
Accelerators(2008.10.28 - 31, SLAC, Stanford, USA)
Hitoshi Murayama“Physics highlights & perspectives”
ASIAA Colloquium(2008.11.18, Inst Astr and Astrophy, Taiwan )Masahiro Takada“Neutrino Mass and Cosmology”
University of Hawaii Colloquium(2008.11.25, Honolulu, Hawaii, USA)
Naoki Yoshida“The First Stars”
Particle Physics, Astrophysics and Quantum Field
Theory: 75 Years since Solvay(2008.11.27 - 29, Nanyang, Singapore)
Hitoshi Murayama“Supersymmetry Breaking and Cosmology”

IPMU ANNUAL REPORT 2008

Conference Talks

PASCOS-08(2008.06.02 - 06, Perimeter Inst, Canada)
Fuminobu Takahashi“The Anthropic Solution to the Strong CP problem”

University of Michigan Physics Colloquium(2008.11.03, Ann Arbor, USA)
Hitoshi Murayama“The Big World of Little Neutrinos”
Indian Strings Meeting 2008
(2008.12.06 - 13, Pondicherry, India)
Shigeki Sugimoto“Properties of Baryons in holographic QCD”
ICRR Theory Workshop(2008.12.08 - 09, ICRR, Japan)
Fuminobu Takahashi“Cosmic rays from dark matter”

52

ITC Colloquium, Harvard University(2008.12.16, Boston, USA)
Naoki Yoshida“Formation of Primordial Stars”
Cosmic-Ray Electron and Positron Workshop(2008.12.24, Waseda U, Tokyo, Japan)
Fuminobu Takahashi“Decaying hidden gauge boson and the PAMELA
and ATIC/PPB-BETS anomaly”
Workshop on QCD Phase Structure(2008.12.25 - 26, Kyushu U, Fukuoka, Japan)
Shigeki Sugimoto“AdS/CFT and its application”
2008 Subaru Users’ Meeting(2009.01.14 - 16, NAOJ, Tokyo, Japan)
Masahiro Takada“Cosmology with WFMOS Survey”

IPMU ANNUAL REPORT 2008

Workshop on Early Structure Formation(2009.1.15, Tsukuba, Japan)
Naoki Yoshida“Formation of Primordial Stars and Blackholes”
New Horizons for Modern Cosmology(2009.01.19 - 03.13, Arcetri, Florence, Italy)
Cosimo Bambi“Strange stars: a laboratory to investigate theproblem of the cosmological constant”
VIPAC meeting(2009.01.27, Heidelberg, Germany)
Taizan Watari“GUT Symmetry Breaking Revisited”

GUT’s in Strings(2009.02.03, DESY, Hamburg, Germany)
Taizan Watari“Yukawa Couplings in F-theory”
Fundamental Aspects of Superstring Theory(2009.02.12, Santa Barbara, USA)
Hirosi Ooguri“Crystal Melting and Quantum Calabi-Yau”
Progress in Particle Physics 2008(2009.02.16 - 19, YKIS, Kyoto, Japan)
Damien Easson“The eta problem and inflation with Hubble mass
inflaton”
Supercomputing in Solid State Physics(2009.2.16, Kashiwa, Japan)
Naoki Yoshida“Supercomputer Simulations of Cosmic Structure
Formation”
International Workshop on Noncommutative
Geometry and Physics(2009.02.18 - 21, Keio U, Tokyo, Japan)
Tadashi Takayanagi“AdS/CFT and Chern-Simons Gauge Theory”
String-Cosmology Workshop(2009.02.18 - 20, Kinosaki, Japan)
Fuminobu Takahashi“Cosmology based on supergravity and related
topics”
Lecture Series at YITP
(2009.02.23 - 24, Kyoto, Japan)
Shinji Mukohyama“Higgs phase of gravity”
KEK Annual Theory Meeting on Particle Physics
Phenomenology (KEKPH09)(2009.03.03 - 06, KEK, Japan)
Fuminobu Takahashi“Non-Gaussianity as a probe of the early Universe”
16th YKIS symposium(2009.03.09, YITP, Kyoto, Japan)
Taizan Watari“From recent developments in F-theory
compactification”
Beatrice M. Tinsley Memorial Lecture(2009.3.23, Austin, USA)
Naoki Yoshida“Formation of primordial stars and blackholes”

JFY2007
H. Kajiura, RIMS Kyoto (Japan), 07/10/29 - 10/29
Y.G. Kim, KAIST (Korea), 07/12/6 - 12/21
D. Kaledin, Steklov Inst (Russia), 07/12/10 - 12/10
G. Polesello, INFN Pavia (Italy), 07/12/15 - 12/22
S.H. Zhou, Penking (China), 07/12/16 - 12/21
T. Lari, INFN Milano (Italy), 07/12/16 - 12/22
Q. Li, Karlsruhe (Germany), 07/12/16 - 12/21
C.P. Yuan, Michigan State (US), 07/12/17 - 12/23
S. Schumann, Edinburgh (UK), 07/12/17 - 12/19
Y. Sumino, Tohoku (Japan), 07/12/17 - 12/19
T. Kamon, Texas A&M (US), 07/12/17 - 12/20
K. Mawatari, KIAS (Korea), 07/12/17 - 12/20
P. Mieda, Harvard (US), 07/12/17 - 12/20
S. Okada, Kobe (Japan), 07/12/17 - 12/20
S.C. Park, Seoul (Korea), 07/12/17 - 12/20
M. Perelstein, Cornell (US), 07/12/17 - 12/20
E. Turner, Princeton (US), 08/1/26 - 2/5
V. Rentala, UC Berkeley (US), 08/1/26 - 4/16
J. Gunn, Princeton (US), 08/1/27 - 08/2/2
M. Vagins, UC Irvine (US), 08/2/18 - 2/20
Y. Nomura, UC Berkeley (US), 08/2/18 - 2/23
D. Poland, UC Berkeley (US), 08/2/18 - 2/23
W. Porod, Wuerzburg (Germany), 08/2/19 - 2/24
A. Ruiter, New Mexico (US), 08/2/23 - 2/25
C. Belzynski, New Mexico (US), 08/2/23 - 2/23
F. Urban, UBC (Canada), 08/2/23 - 3/1
A. Slosar, LBNL (US), 08/3/1 - 3/20
A.B. McDonald, Queens (Canada), 08/3/4 - 3/14
S. Katsanevas, Paris (France), 08/3/8 - 3/12
K. Jacobs, Freiburg (Germany), 08/3/8 - 3/14
T. Dimofte, Caltech (US), 08/3/8 - 3/16
S.T. Yau, Harvard (US), 08/3/9 - 3/13
G.F. Giudice, CERN (Switzerland), 08/3/9 - 3/14
S.D.M. White, Max Planck (Germany), 08/3/9 - 3/14
D.J. Gross, UCSB (US), 08/3/9 - 3/15
J. Siegrist, LBNL (US), 08/3/9 - 3/12
M. Dilworth, NSF Tokyo Office (Japan), 08/3/10 - 3/10
H. Goto, KEK (Japan), 08/3/10 - 3/10
S. Hamamoto, Toyama (Japan), 08/3/10 - 3/10
T. Kawano, Tokyo (Japan), 08/3/10 - 3/10
K. Matsumoto, KEK (Japan), 08/3/10 - 3/10
S. Miyoki, ICRR Tokyo (Japan), 08/3/10 - 3/10
S. Nagataki, YITP Kyoto (Japan), 08/3/10 - 3/10
E. Nakamura, Tokyo (Japan), 08/3/10 - 3/10
K. Nakamura, Soukendai NAOJ (Japan), 08/3/10 - 3/10
D. Perret-gallix, FJPPL/IN2P3/CNRS (France), 08/3/10 - 3/10
F. Scardigi, YITP Kyoto (Japan), 08/3/10 - 3/10
N. Tominaga, NAOJ (Japan), 08/3/10 - 3/10
K. Uzawa, Kwansei Gakuin (Japan), 08/3/10 - 3/10
M. Yamashita, ICRR Tokyo (Japan), 08/3/10 - 3/10
Y.K. Kim, Chicago/Fermilab (US), 08/3/10 - 3/12
R.J. Gaitskell, Brown (US), 08/3/10 - 3/15
J. Ellis, CERN (Switzerland), 08/3/10 - 3/12
D. Easson, Durham (UK), 08/3/10 - 3/12
Y. Abe, Cereja Tech Co. (Japan), 08/3/11 - 3/11
M. Abou, KEK (Japan), 08/3/11 - 3/11
M. Bando, Aichi (Japan), 08/3/11 - 3/11
J. Daniel, Kobe (Japan), 08/3/11 - 3/11
T. Deguchi, Ochanomizu (Japan), 08/3/11 - 3/11
M. Fujii, Kyoto (Japan), 08/3/11 - 3/11

K. Fukaya, Kyoto (Japan), 08/3/11 - 3/11
A. Gerard, Cheng Kung (Taiwan), 08/3/11 - 3/11
R. Goto, Osaka (Japan), 08/3/11 - 3/11
K. Hasegawa, Tohoku (Japan), 08/3/11 - 3/11
H. Hata, Ochanomizu (Japan), 08/3/11 - 3/11
M. Hayashi, NAOJ (Japan), 08/3/11 - 3/11
T. Hirayama, Nat’l Ctr Theo Sci (Taiwan), 08/3/11 - 3/11
J. Hisano, ICRR Tokyo (Japan), 08/3/11 - 3/11
K. Ichikawa, ICRR Tokyo (Japan), 08/3/11 - 3/11
S. Ichinose, Shizuoka (Japan), 08/3/11 - 3/11
N. Ikeda, Ritsumeikan (Japan), 08/3/11 - 3/11
M. Ishida, Meisei (Japan), 08/3/11 - 3/11
S. Iso, KEK (Japan), 08/3/11 - 3/11
K. Ito, Titech (Japan), 08/3/11 - 3/11
K. Iwasaki, Titech (Japan), 08/3/11 - 3/11
F. Kajino, Konan (Japan), 08/3/11 - 3/11
T. Kalman, Tokyo Komaba (Japan), 08/3/11 - 3/11
S. Kasuya, Kanagawa (Japan), 08/3/11 - 3/11
Y. Kawahigashi, Tokyo Komaba (Japan), 08/3/11 - 3/11
Y. Kikukawa, Tokyo (Japan), 08/3/11 - 3/11
Y. Kitazawa, KEK (Japan), 08/3/11 - 3/11
K. Kiyohara, Okayama (Japan), 08/3/11 - 3/11
C. Kobayashi, NAOJ (Japan), 08/3/11 - 3/11
K. Konichi Kohki, Tokyo (Japan), 08/3/11 - 3/11
M. Kotani, Tohoku (Japan), 08/3/11 - 3/11
T. Kugo, YITP Kyoto (Japan), 08/3/11 - 3/11
C. Matsui, Tokyo (Japan), 08/3/11 - 3/11
T. Matsuki, Tokyo Kasei (Japan), 08/3/11 - 3/11
T. Miwa, Titech (Japan), 08/3/11 - 3/11
K. Mizutani, Saitama (Japan), 08/3/11 - 3/11
S. Morita, Tokyo Komaba (Japan), 08/3/11 - 3/11
J. Murakami, Waseda (Japan), 08/3/11 - 3/11
M. Nagai, ICRR Tokyo (Japan), 08/3/11 - 3/11
K. Nagano, KEK (Japan), 08/3/11 - 3/11
S. Nakamura, Tohoku (Japan), 08/3/11 - 3/11
N. Yoshida, Nagoya (Japan), 08/3/11 - 3/11
H. Naruse, Okayama (Japan), 08/3/11 - 3/11
G. Novichikov, Keio (Japan), 08/3/11 - 3/11
K. Okamura, Tokyo (Japan), 08/3/11 - 3/11
Y. Okochi, Caltech (US), 08/3/11 - 3/11
H. Omori, Tokyo (Japan), 08/3/11 - 3/11
K. Sakai, Tokyo Komaba (Japan), 08/3/11 - 3/11
H. Sato, Hyogo U of Edu (Japan), 08/3/11 - 3/11
H. Sekiya, ICRR Tokyo (Japan), 08/3/11 - 3/11
M. Seta, Tsukuba (Japan), 08/3/11 - 3/11
K. Shackleton, Titech (Japan), 08/3/11 - 3/11
D. Sternhaimer, Bourgogne (France), 08/3/11 - 3/11
S. Sugimoto, Nagoya (Japan), 08/3/11 - 3/11
M. Tada, SEIKO EG &G Co. (Japan), 08/3/11 - 3/11
K. Takemura, Yokohama City U (Japan), 08/3/11 - 3/11
K. Takenaga, Tohoku (Japan), 08/3/11 - 3/11
Y. Takeuchi, ICRR Tokyo (Japan), 08/3/11 - 3/11
R. Tanaka, Okayama (Japan), 08/3/11 - 3/11
D. Tarama, Kyoto (Japan), 08/3/11 - 3/11
T. Tsuboi, Tokyo Komaba (Japan), 08/3/11 - 3/11
T. Uematsu, Kyoto (Japan), 08/3/11 - 3/11
K. Usui, Tokyo (Japan), 08/3/11 - 3/11
T. Watari, Tokyo (Japan), 08/3/11 - 3/11
Y. Yabu, Kyoto (Japan), 08/3/11 - 3/11
M. Yamanaka, Saitama (Japan), 08/3/11 - 3/11
M. Yamaguchi, Tohoku (Japan), 08/3/11 - 3/11
M. Yamazaki, Tokyo (Japan), 08/3/11 - 3/11

53

Conference Talks

Colloquium at Carnegie Observatory(2008.12.02, Pasadena, USA)
Masahiro Takada“Subaru Weak Lensing Study of Galaxy Clusters”

Northwestern University Colloquia(2009.01.30, Chicago, USA)
Hitoshi Murayama“The Big World of Little Neutrinos”

IPMU ANNUAL REPORT 2008

Excellence Cluster Science Week
(2008.12.01 - 04, Max-Planck Institute, Garching,
Germany)
Fuminobu Takahashi“Cosmic-ray positrons from decaying dark matter”

Visitors

10. Visitors

IPMU ANNUAL REPORT 2008

Y.T. Lin, Princeton (US), 08/4/3 - 4/6
S. Ando, Caltech (US), 08/4/11 - 4/11
J. Figueroa-O’Farrill, Edinburgh (UK), 08/4/16 - 4/16
M. Mulase, UC Davis (US), 08/4/23 - 4/24
K. Hori, Toronto (Canada), 08/4/24 - 5/6
K. Martens, Utah (US), 08/5/11 - 5/16
J.M. Bismut, Paris-Sud Orsay (France), 08/5/12 - 5/12
A. Bondal, Aberdeen (UK), 08/5/14 - 5/16
J. McKay, Concordia (Canada), 08/5/18 - 5/24
J.M. Bismut, Paris-Sud Orsay (France), 08/5/19 - 5/19
K. Ueda, Osaka (Japan), 08/5/21 - 5/21
J. Conway, Princeton (US), 08/5/21 - 5/24
R.L. Griess, Michigan (US), 08/5/21 - 5/24
C.H. Lam, Taiwan (Taiwan), 08/5/21 - 5/24
T. Basak, Chicago (US), 08/5/21 - 5/25
J.F. Duncan, Harvard (US), 08/5/21 - 5/26
H. Yamauchi, Aichi U of Edu (Japan), 08/5/21 - 5/24
H. Shimakura, Aichi U of Edu (Japan), 08/5/21 - 5/24
K. Maehata, Image Mission Co. (Japan), 08/5/22 - 5/22
M. Fujii, Kyoto (Japan), 08/5/22 - 5/24
K. Harada, Ohio State (US), 08/5/22 - 5/24
K. Ishihara, Saitama (Japan), 08/5/22 - 5/24
Y. Kawahigashi, Tokyo Komaba (Japan), 08/5/22 - 5/24
M. Kitazume, Chiba (Japan), 08/5/22 - 5/24
S. Kondo, Nagoya (Japan), 08/5/22 - 5/24
A. Matsuo, Tokyo Komaba (Japan), 08/5/22 - 5/24
A. Munemasa, Tohoku (Japan), 08/5/22 - 5/24
I. Nakamura, Hokkaido (Japan), 08/5/22 - 5/24
K. Naoi, Tokyo Komaba (Japan), 08/5/22 - 5/24
S. Robert, free writer (Canada), 08/5/22 - 5/24
T. Takebe, Ochanomizu (Japan), 08/5/22 - 5/24
H. Yamada, Hitotsubashi (Japan), 08/5/22 - 5/25
E.L. Turner, Princeton (US), 08/5/28 - 6/12
N. Okada, KEK (Japan), 08/5/29 - 5/29
K. Hori, Toronto (Canada), 08/5/29 - 6/8
C.S. Park, Caltech (US), 08/6/6 - 6/26
J.W. Song, Caltech (US), 08/6/6 - 6/26
M. Douglas, Rutgers (US), 08/6/7 - 6/11
A. Ibarra, DESY (Germany), 08/6/9 - 6/9

Y. Okawa, Tokyo (Japan), 08/9/12 - 9/17
S. Pilansky, Komaba Tokyo (Japan), 08/9/12 - 9/17
Y. Sekino, Okayama Inst Quantum Phys (Japan), 08/9/12 - 9/17
N. Shiiki, Tokyo (Japan), 08/9/12 - 9/17
K. Shirokawa, Academia Sinica Taiwan (Taiwan), 08/9/12 -9/17
T. Azuma, Setsunan (Japan), 08/9/12 - 9/16
M. Fujita, Kyoto (Japan), 08/9/12 - 9/16
K. Hasebe, Takuma-ct (Japan), 08/9/12 - 9/16
S. Hikami, Tokyo (Japan), 08/9/12 - 9/16
M. Honda, Soukendai (Japan), 08/9/12 - 9/16
A. Hosoya, Titech (Japan), 08/9/12 - 9/16
T. Kikuchi, Kyoto (Japan), 08/9/12 - 9/16
Y. Kitazawa, KEK (Japan), 08/9/12 - 9/16
N. Manabe, Soukendai (Japan), 08/9/12 - 9/16
K. Matsumoto, KEK (Japan), 08/9/12 - 9/16
T. Matsuo, Tsukuba (Japan), 08/9/12 - 9/16
T. Sugawa, Osaka city (Japan), 08/9/12 - 9/16
Y. Sumitomo, KEK (Japan), 08/9/12 - 9/16
H. Tanaka, Tokyo (Japan), 08/9/12 - 9/16
Y. Tsuchiya, Tokyo (Japan), 08/9/12 -9/16
K. Umetsu, Nihon (Japan), 08/9/12 - 9/16
N. Yamamoto, Tokyo (Japan), 08/9/12 - 9/16
S. Yokoyama, Tokyo (Japan), 08/9/12 - 9/16
M. Yoshimatsu, Tokyo (Japan), 08/9/12 - 9/16
Y. Akamatsu, Tokyo (Japan), 08/9/12 - 9/17
T. Azeyanagi, Kyoto (Japan), 08/9/12 - 9/17
S. Matsuura, Tokyo (Japan), 08/9/12 - 9/17
T.S. Tai, Riken (Japan), 08/9/12 - 9/18
B. Leclerc, Caen (France), 08/9/13 - 9/20
T. Nishioka, Kyoto (Japan), 08/9/13 - 9/16
R. Kodera, Tokyo (Japan), 08/9/16 - 9/18
T. Kuwabara, RIMS Kyoto (Japan), 08/9/16 - 9/18
S. Ariki, RIMS Kyoto (Japan), 08/9/16 - 9/18
N. Enomoto, RIMS Kyoto (Japan), 08/9/16 - 9/18
S. Kito, RIMS Kyoto (Japan), 08/9/16 - 9/18
K. Nagao, Kyoto (Japan), 08/9/16 - 9/18
S. Naito, Tsukuba (Japan), 08/9/16 - 9/18
R. Ohkura, Titech (Japan), 08/9/16 - 9/18
Y. Saito, Tokyo (Japan), 08/9/16 - 9/18
N. Sawada, Tsukuba (Japan), 08/9/16 - 9/18
D. Sternhaimer, Bourgogne (France), 08/9/16 - 9/18
S. Tsuchiura, RIMS Kyoto (Japan), 08/9/16 - 9/18
Y. Voglaine, Louvain (Belguim), 08/9/16 - 9/18
S. Dedeo, Chicago (US), 08/9/19 - 10/10
A.E. Romano, YITP Kyoto (Japan), 08/9/22 - 9/22
E.L. Turner, Princeton (US), 08/9/27 - 10/12
T. Broadhurst, Tel Aviv (Israel), 08/9/28 - 10/15
D. Lemze, Tel Aviv (Israel), 08/9/28 - 10/15
S.B. Gudnason, Pisa (Italy), 08/10/2 - 10/2
W.S. Hou, Taiwan (Taiwan), 08/10/2 - 10/2
S. Gorchinskiy, Steklov Math Inst (Russia), 08/10/6 - 11/7
S. Shimizu, DESY (Germany), 08/10/9 - 10/9
J. Alwall, Stanford (US), 08/10/13 - 12/19
Y.K. Kim, Chicago/Fermilab (US), 08/10/14 - 10/14
M. Kontsevich, IHES (France), 08/10/14 - 10/14
A. Kusenko, UCLA (US), 08/10/16 - 12/13
D. Bernstein, UCSB (US), 08/10/22 - 10/22
H. Foglizzo, Service d’Astro Phys (France), 08/10/22 -10/22
A. Kirillov, RIMS Kyoto (Japan), 08/10/26 - 10/27
M. Semenov-Tian-Shansky, Bourgogne (France), 08/10/26 - 10/27
H. Takahashi, Hiroshima (Japan), 08/10/30 - 10/30
J. Conlon, Cambridge (UK), 08/11/1 - 11/15

Visitors

S. Bickerton, Princeton (US), 08/7/22 - 7/28
C. Loomis, Princeton (US), 08/7/22 - 7/28
F. Mullally, Princeton (US), 08/7/22 - 7/28
K. Izumi, Kyoto (Japan), 08/7/23 - 7/23
K. Oda, Osaka (Japan), 08/7/23 - 7/23
H. Sugiyama, SISSA (Italy), 08/7/25 - 8/10
W. Lin, Kyushu (Japan), 08/7/28 - 7/28
K. Hori, Toronto (Canada), 08/7/29 - 10/31
A. Bondal, Aberdeen (UK), 08/8/4 - 11/30
I. Zhdanovskiy, Moscow (Russia), 08/8/4 - 8/31
D.F. Gao, Tronto (Canada), 08/8/6 - 11/30
D. Goldberg, Drexel (US), 08/8/15 - 8/31
B.K. Fujikawa, LBNL (US), 08/8/17 - 9/21
H. Furusawa, NAOJ (Japan Hawaii), 08/8/18 - 8/20
Y.G. Kim, KAIST (Korea), 08/8/22 - 8/22
E. Kearns, Boston (US), 08/8/24 - 8/31
A. Frolov, Simon Fraser (Canada), 08/8/28 - 8/28
C. Walter, Duke (US), 08/8/28 - 9/16
M. Verbitsky, Moscow (Russia), 08/9/1 - 09/2/28
H. Kajiura, Chiba (Japan), 08/9/1 - 9/5
B. Kim, KIAS (Korea), 08/9/1 - 9/5
K. Altmann, Berlin (Germany), 08/9/1 - 9/6
S. Galkin, Steklov Math Inst (Russia), 08/9/1 - 9/6
M. Perling, Bochum (Germany), 08/9/1 - 9/6
V. Przyjalkowski, Steklov Math Inst (Russia), 08/9/1 - 9/7
A. Takahashi, Osaka (Japan), 08/9/1 - 9/5
M. Kobayashi, Tokyo Met (Japan), 08/9/1 - 9/5
R. Okawa, Titech (Japan), 08/9/1 - 9/5
S. Okuhara Saki, Tokyo Met (Japan), 08/9/1 - 9/5
M. Sakurai, Tokyo (Japan), 08/9/1 - 9/5
H. Uehara, Tokyo Met (Japan), 08/9/1 - 9/5
K. Yoshioka, Kobe (Japan), 08/9/1 - 9/5
S. Freedman, UC Berkeley (US), 08/9/2 - 9/16
Y. Hikida, KEK (Japan), 08/9/3 - 9/3
A. Kuznetsov, Steklov Math Inst (Russia), 08/9/3 - 9/11
N. Iizuka, UCSB (US), 08/9/7 - 9/20
M. Yamazaki, Tokyo (Japan), 08/9/8 - 9/16
M. Kakizaki, Bonn (Germany), 08/9/9 - 9/9
W.D. Ruan, KAIST (Korea), 08/9/10 - 9/17
S. Moriyama, Nagoya (Japan), 08/9/11 - 9/16
S. Mukhi, TIFR (India), 08/9/11 - 9/16
A. Dabholkar, Paris (France), 08/9/11 - 9/17
V. Hubeny, Durham (UK), 08/9/11 - 9/17
F.L. Lin, Taiwan (Taiwan), 08/9/11 - 9/17
G. Mandal, TIFR (India), 08/9/11 - 9/17
M. Rangamani, Durham (UK), 08/9/11 - 9/17
A. Rosly, ITEP (Russia), 08/9/11 - 10/22
H. Goto, KEK (Japan), 08/9/11 - 9/16
K. Hotta, Hokkaido (Japan), 08/9/11 - 9/16
Y. Efremenko, Tennessee (US), 08/9/11 - 10/2
P. Decowski, LBNL (US), 08/9/11 - 9/15
Y. Hikida, KEK (Japan), 08/9/11 - 9/17
S. Nakamura, Hanyang (Korea), 08/9/11 - 9/19
K. Hashimoto, RIKEN (Japan), 08/9/12 - 9/17
Y. Hyakutake, Osaka (Japan), 08/9/12 - 9/17
T. Ishii, Osaka (Japan), 08/9/12 - 9/17
S. Iso, KEK (Japan), 08/9/12 - 9/17
D. Kabat, Columbia (US), 08/9/12 - 9/17
Y. Michishita, Kagoshima (Japan), 08/9/12 - 9/17
M. Nakashima, Tokyo (Japan), 08/9/12 - 9/17
M. Natsuume, KEK (Japan), 08/9/12 - 9/17
J. Nishimura, KEK (Japan), 08/9/12 - 9/17

55

54

JFY2008

E. Komatsu, Texas (US), 08/6/9 - 6/20
M. Yamazaki, Tokyo (Japan), 08/6/9 - 6/27
A. Neitzke, Princeton (US), 08/6/12 - 6/25
K. Hori, Toronto (Canada), 08/6/14 - 6/17
K. Nagamine, Nevada (US), 08/6/16 - 8/15
Y. Watanabe, Texas (US), 08/6/16 - 6/20
A. Mikhailov, Caltech (US), 08/6/17 - 7/1
S. Schfer-Nameki, Caltech (US), 08/6/17 - 7/3
D. Nitta, Tohoku (Japan), 08/6/17 - 6/19
S. Hellerman, Princeton (US), 08/6/21 - 6/24
T. Moroi, Tohoku (Japan), 08/6/22 - 6/27
K. Takahashi, KEK (Japan), 08/6/22 - 6/27
D. Auston, Kavli Foundation (US), 08/6/23 - 6/23
M. Chun, Kavli Foundation (US), 08/6/23 - 6/23
R. Cavanauch, Florida (US), 08/6/23 - 6/27
H.C. Cheng, UC Davis (US), 08/6/23 - 6/27
S.P. Das, Bonn (Germany), 08/6/23 - 6/27
P. Fox, Fermilab (US), 08/6/23 - 6/27
R. Frederix, Louvain (Belgium), 08/6/23 - 08/6/27
I.W. Kim, Seoul (Korea), 08/6/23 - 6/27
Y.G. Kim, KAIST (Korea), 08/6/23 - 6/27
R. Kitano, Los Alamos (US), 08/6/23 - 6/27
T. Lari, INFN Milano (Italy), 08/6/23 - 6/27
C. Lester, Cambridge (UK), 08/6/23 - 6/27
T. Okui, J Hopkins (US), 08/6/23 - 6/27
E.K. Park, Florida (US), 08/6/23 - 6/27
J.G. Wacker, SLAC (US), 08/6/23 - 6/27
S. Bornhauser, Bonn (Germany), 08/6/23 - 6/27
S. Dutta, Delhi (India), 08/6/23 - 6/26
A. Akeroyd, Chen Kung (Taiwan), 08/6/23 - 6/27
M. Asano, ICRR Tokyo (Japan), 08/6/23 - 6/27
B. Gong, Chinese Acad Sci (China), 08/6/23 - 6/27
K. Hiramatsu, Soukendai (Japan), 08/6/23 - 6/27
J. Hisano, ICRR Tokyo (Japan), 08/6/23 - 6/27
K. Igi, RIKEN (Japan), 08/6/23 - 6/27
B. Jager, KEK (Japan), 08/6/23 - 6/27
S. Matsumoto, Toyama (Japan), 08/6/23 - 6/27
M. Nagai, KEK (Japan), 08/6/23 - 6/27
E. Nakamura, Tokyo (Japan), 08/6/23 - 6/27
K. Nakamura, ICRR Tokyo (Japan), 08/6/23 - 6/27
T. Okada, ICRR Tokyo (Japan), 08/6/23 - 6/27
F. Rikkert, Louvain (Belgium), 08/6/23 - 6/27
K. Sakurai, Nagoya (Japan), 08/6/23 - 6/27
T. Sekiguchi, ICRR Tokyo (Japan), 08/6/23 - 6/27
T. Shimada, Meiji (Japan), 08/6/23 - 6/27
W. Sreethawong, KEK (Japan), 08/6/23 - 6/27
T. Takayama, ICRR Tokyo (Japan), 08/6/23 - 6/27
M. Takeuchi, Kyoto & KEK (Japan), 08/6/23 - 6/27
Y. Yonekura, Tokyo (Japan), 08/6/23 - 6/27
M. Passera, INFN (Italy), 08/6/24 - 6/24
J.M. Garcia-Islas, Nat’l Auton (Mexico), 08/6/25 - 6/25
J. Xiao, Tsinghua (China), 08/7/5 - 8/4
F. Xu, Tsinghua (China), 08/7/5 - 8/4
M. Kiermaier, MIT (US), 08/7/7 - 7/14
S. Kawagoe, Tokyo (Japan), 08/7/10 - 7/10
K. Sakai, Keio (Japan), 08/7/16 - 7/16
K. Kadota, Minnesota (US), 08/7/16 - 7/18
M. Kiermaier, MIT (US), 08/7/20 - 8/14
Y. Okawa, Tokyo (Japan), 08/7/21 - 7/22
L. Boyle, Toronto (Canada), 08/7/21 - 7/28
R. Lupton, Princeton (US), 08/7/22 - 7/26
M. Strauss, Princeton (US), 08/7/22 - 7/26

IPMU ANNUAL REPORT 2008

Visitors

K. Yonekura, Tokyo (Japan), 08/3/11 - 3/11
S. Petcov, SISSA (Italy), 08/3/12 - 4/18
R. Peccei, UCLA (US), 08/3/12 - 3/14
N. Reshetikhin, UC Berkeley (US), 08/3/12 - 3/14
D.R. Morrison, UCSB (US), 08/3/12 - 3/15
A. Kusenko, UCLA (US), 2008/3/14 - 3/25
H. Robertson, Washington (US), 08/3/15 - 3/21
E. Pierpaoli, U Southern Cal (US), 08/3/15 - 3/23
A. Giuliani, INFN Milano (Italy), 08/3/16 - 3/21
G.G. Raffelt, Max Planck (Germany), 08/3/16 - 3/22
V. Rodin, Tuebingen (Germany), 08/3/16 - 3/22
P. Di Bari, INFN Padova (Italy), 08/3/17 - 3/20
B. Kim, KIAS (Korea), 08/3/19 - 3/22
Y.G. Oh, Wisconsin (US), 08/3/19 - 3/22
K. Hori, Toronto (Canada), 08/3/19 - 3/23
A. Dhar, TIFR (India), 08/3/20 - 3/22
K. Liu, UCLA (US), 08/3/20 - 3/22
A. Sen, Harish-Chandra Inst (India), 08/3/20 - 3/22
P.J. Yi, KIAS (Korea), 08/3/20 - 3/22
S.J. Rey, Seoul (Korea), 08/3/20 - 3/23

K. Sakurai, Nagoya (Japan), 09/3/16 - 3/20
H. Yokoya, Niigata (Japan), 09/3/16 - 3/20
H. Nakaoka, Tokyo (Japan), 09/3/19 - 3/19
N. Turok, Perimeter Inst (Canada), 09/3/26 - 3/26
R. Gregory, Durham (UK), 09/3/27 - 09/4/10
H. Tye, Cornell (US), 09/3/27 - 09/4/2
W. Song, Inst Theo Phys (China), 09/3/30 - 09/4/3
F. Urban, UBC (Canada), 09/3/31 - 09/4/2

Visitors

A. De Roeck, Antwerpen (Belguim), 09/3/16 - 3/20
T. Tait, Argonne & Northwestern (US), 09/3/16 - 3/20
H.C. Tsai, Taiwan (Taiwan), 09/3/16 - 3/20
B. Webber, Cambridge (UK), 09/3/16 - 3/20
B. Francesca, CERN (Switzerland), 09/3/16 - 3/20
J.S. Lee, Nat’l Center for Theor Sci (Taiwan), 09/3/16 - 3/20
S. Ferrag, Glasgow (UK), 09/3/16 - 3/20
K. Igi, Riken (Japan), 09/3/16 - 3/20

57

M. Rocek, Stony Brook (US), 09/1/5 - 1/8
C. Albertsson, YITP Kyoto (Japan), 09/1/5 - 1/8
N. Yotsutani, Nagoya (Japan), 09/1/5 - 1/8
T. Mabuchi, Osaka (Japan), 09/1/6 - 1/8
G. Grantcharov, Florida Int’l (US), 09/1/7 - 1/12
Y. Nakayama, UC Berkeley (US), 09/1/8 - 1/8
E. Turner, Princeton (US), 09/1/11 - 1/30
M. Ooguri, Stanford (US), 09/1/12 - 1/25
U. Maio, Max Planck (Germany), 09/1/15 - 1/15
J. Zaanen, Leiden (Netherland), 09/1/15 - 1/15
H. Yu, UC Irvine (US), 09/1/15 - 1/27
C. Loomis, Princeton (US), 09/1/21 - 1/21
M. Mriek, Princeton (US), 09/1/21 - 1/21
M. Strauss, Princeton (US), 09/1/21 - 1/21
R. Lupton, Princeton (US), 09/1/21 - 1/22
R. Brandenberger, McGill (Canada), 09/1/21 - 1/24
R. Ookawa, Titech (Japan), 09/1/22 - 1/22
A. Moro-Martin, Princeton (US), 09/1/23 - 1/23
A. Ferrara, Scuola Normale Superiore Pisa (Italy), 09/1/27 - 1/27
T. Nishioka, Kyoto (Japan), 09/1/29 - 1/29
D. Sternheimer, Keio (Japan), 09/2/5 - 2/5
R. Brandenberger, McGill (Canada), 09/2/9 - 2/9
H. Maeda, Centro de Estudios Cientificos (Chille), 09/2/9 - 2/9
M. Ibe, SLAC (US), 09/2/12 - 2/12
Y. Wang, IHEP (China), 09/2/12 - 2/12
B.K. Fujikawa, LBNL (US), 09/2/15 - 3/2
S. Ma, Tokyo (Japan), 09/2/19 - 2/19
F.D. Steffen, Max Planck (Germany), 09/2/19 - 2/19
A.G. De Bruyn, ASTRON (Netherland), 09/2/24 - 2/24
S. Zaroubi, Kapteyn Astr Inst (Netherland), 09/2/24 - 2/24
N. Afshordi, Perimeter Inst (Canada), 09/2/24 - 3/1
G. Ghazal, Perimeter Inst (Canada), 09/2/24 - 3/1
S. Glover, Heidelberg (Germany), 09/2/28 - 3/15
I. Nisoli, Pisa (Italy), 09/2/28 - 5/25
S. Katsanevas, Paris (France), 09/3/2 - 3/2
S.P. Oh, UCSB (US), 09/3/2 - 3/12
C.P. Yuan, Michigan (US), 09/3/2 - 3/13
A. Karch, Washington (US), 09/3/12 - 3/12
M. Bersten, Chille (Chille), 09/3/13 - 09/4/30
L. Wang, Princeton (US), 09/3/15 - 3/21
M. Lisanti, Stanford (US), 09/3/15 - 3/22
J. Alwall, SLAC (US), 09/3/15 - 3/22
K. Hirotani, Tsing Hua (Taiwan), 09/3/16 - 3/16
B. Allanach, Cambridge (UK), 09/3/16 - 3/20
A. Barr, Oxford (UK), 09/3/16 - 3/20
W. Cho, KAIST (Korea), 09/3/16 - 3/20
K. Choi, KAIST (Korea), 09/3/16 - 3/20
C. Csaki, Cornell (US), 09/3/16 - 3/20
C. Duhl, Louvain (Belguim), 09/3/16 - 3/20
R.M. Godbole, Indian Inst Science (India), 09/3/16 - 3/20
B. Gripaios, CERN (Swittzerland), 09/3/16 - 3/20
T. Han, Wisconsin-Madison (US), 09/3/16 - 3/20
K. Hasegawa, DESY (Germany), 09/3/16 - 3/20
M. Herquet, NIKHEF (Netherland), 09/3/16 - 3/20
N. Kersting, Sichuan (China), 09/3/16 - 3/20
K. Kong, Fermilab (US), 09/3/16 - 3/20
K. Mawatari, Heidelberg (Germany), 09/3/16 - 3/20
M. Park, Florida (US), 09/3/16 - 3/20
M. Peskin, SLAC (US), 09/3/16 - 3/20
T. Plehn, Heidelberg (Germany), 09/3/16 - 3/20
G. Polesello, INFN (Italy), 09/3/16 - 3/20
A.R. Raklev, Cambridge (UK), 09/3/16 - 3/20

IPMU ANNUAL REPORT 2008

Visitors
56
IPMU ANNUAL REPORT 2008

S. Blinnikov, ITEP (Russia), 08/11/1 - 09/4/30
L. Hall, UC Berkeley (US), 08/11/3 - 11/12
T. Takeuchi, Virginia Tech (US), 08/11/3 - 11/28
E. Kearns, Boston (US), 08/11/6 - 11/11
C.L. Shan, Seoul (Korea), 08/11/6 - 11/6
S. Ho, Princeton (US), 08/11/7 - 11/16
K. Koyama, Portsmouth (UK), 08/11/10 - 11/10
M. Limongi, INAF (Italy), 08/11/16 - 11/18
D.R. Morrison, UCSB (US), 08/11/16 - 11/18
L.F. Wang, Texas A&M (US), 08/11/16 - 11/18
R. Peccei, UCLA (US), 08/11/17 - 11/18
C. Fryer, Los Alamos (US), 08/11/17 - 11/21
G. Fuller, UCSD (US), 08/11/17 - 11/21
C. Gerardy, Florida State (US), 08/11/17 - 11/21
M. Hamuy, Chille (Chille), 08/11/17 - 11/21
J. Hidaka, UCSD (US), 08/11/17 - 08/11/21
Y. Ihara, Tokyo (Japan), 08/11/17 - 11/21
N. Iwamoto, JAEA (Japan), 08/11/17 - 11/21
N. Izutani, Tokyo (Japan), 08/11/17 - 11/21
T. Kajino, NAOJ (Japan), 08/11/17 - 11/21
Y. Kamiya, Tokyo (Japan), 08/11/17 - 11/21
K. Konichi, ICRR Tokyo (Japan), 08/11/17 - 11/21
M. Kutsuna, RESCEU Tokyo (Japan), 08/11/17 - 11/21
A. Mizuta, Chiba (Japan), 08/11/17 - 08/11/21
T. Moriya, Tokyo (Japan), 08/11/17 - 11/21
P. Nugent, LBNL (US), 08/11/17 - 11/21
G. Pignata, Chille (Chille), 08/11/17 - 11/21
I. Sakon, Tokyo (Japan), 08/11/17 - 11/21
T. Sekiguchi, ICRR Tokyo (Japan), 08/11/17 - 11/21
Y. Suwa, Tokyo (Japan), 08/11/17 - 11/21
M. Tanaka, Tokyo (Japan), 08/11/17 - 11/21
H. Tsunemi, Osaka (Japan), 08/11/17 - 11/21
H. Umeda, Tokyo (Japan), 08/11/17 - 11/21
N. Yasuda, ICRR Tokyo (Japan), 08/11/17 - 11/21
T. Yoshida, NAOJ (Japan), 08/11/17 - 11/21
P. Chen, SLAC (US), 08/11/19 - 11/19
H.C. Wang, Taiwan (Taiwan), 08/11/19 - 11/19
R. Nakajima, LBNL (US), 08/11/25 - 11/28
E. Sorokina, ITEP (Russia), 08/11/30 - 12/30
D. Nagai, Yale (US), 08/12/1 - 12/1
J. Peacock, Edinburgh (UK), 08/12/8 - 12/12
R. Ellis, Caltech (US), 08/12/8 - 12/14
M. Staudacher, Max Planck (Germany), 08/12/9 - 12/10
B. Eynard, CEA Saclay (France), 08/12/11 - 12/13
M. Mulase, UC Davis (US), 08/12/11 - 12/13
B. Safnuk, Central Michigan (US), 08/12/11 - 12/13
L. Deccart, Princeton (US), 08/12/14 - 09/1/7
M. Takeuchi, Kyoto & KEK (Japan), 08/12/17 - 12/20
S. Bruenn, Florida Atlantic (US), 08/12/17 - 12/21
A. Hanany, MIT (US), 08/12/18 - 09/1/21
D. Kaledin, Steklov Math Inst (Russia), 09/1/4 - 1/13
S. Kawamura, NAOJ (Japan), 09/1/5 - 1/5
A. Futaki, Titech (Japan), 09/1/5 - 1/5
H. Hoekstra, Leiden (Netherland), 09/1/5 - 09/1/12
L. Ornea, Bucharest (Romania), 09/1/5 - 1/17
K. Choi, Kaist (Korea), 09/1/5 - 1/18
G. Cavalcanti, Utrecht (Netherland), 09/1/5 - 1/8
A. Fujiki, Osaka (Japan), 09/1/5 - 1/8
R. Goto, Osaka (Japan), 09/1/5 - 1/8
A. Tomasiello, Harvard (US), 09/1/5 - 1/8
U. Lindstrom, Uppsala (Sweden), 09/1/5 - 1/8
L. Martucci, LMU München (Germany), 09/1/5 - 1/8

11. Publications

JFY2008
Constraints on scalar-tensor models of dark energy
from observational and local gravity tests,
Shinji Tsujikawa, Kotub Uddin, Shuntaro Mizuno, Reza
Tavakol, Jun’ichi Yokoyama,
Phys. Rev. D 77, 103009 (2008)

58

Moduli stabilization in stringy ISS models,Yu Nakayama, M. Yamazaki, T. T. Yanagida,
Phys. Lett. B 663, 281 (2008)
Affleck Dine leptogenesis via multiple flat
directions,Kohei Kamada, Jun’ichi Yokoyama,
Phys. Rev. D 78, 043502 (2008)
Inflation at the GUT scale in a Higgsless universe,
Nemanja Kaloper, Lorenzo Sorbo, Jun’ichi Yokoyama,
Phys. Rev. D 78, 043527 (2008)
Early Formation of Dust in the Ejecta of Type Ib
SN 2006jc and Temperature and Mass of the Dust,
Takaya Nozawa, Takashi Kozasa, Nozomu Tominaga,
Itsuki Sakon, Masaomi Tanaka, Tomoharu Suzuki,
Ken’ichi Nomoto, Keiichi Maeda, Hideyuki Umeda,
Marco Limongi, Takashi Onaka,
Astrophys J. 684, 1343 (2008)

IPMU ANNUAL REPORT 2008

Probing reheating temperature of the universe
with gravitational wave background,
Kazunori Nakayama, Shun Saito, Yudai Suwa, Jun’ichi
Yokoyama,
JCAP 06, 020 (2008)
Single-field inflation, anomalous enhancement ofsuperhorizon fluctuations, and non-Gaussianity inprimordial black hole formation,
Ryo Saito, Jun’ichi Yokoyama, Ryo Nagata,
JCAP 06, 024 (2008)

Non-Gaussianity from Symmetry,
Teruaki Suyama and Fuminobu Takahashi,
JCAP 09, 007 (2008)
Subaru and Keck Observations of the Peculiar
Type Ia Supernova 2006gz at Late Phases,
Keiichi Maeda, Koji Kawabata, Weidong Li, Masaomi
Tanaka, Paolo A. Mazzali, Takashi Hattori, Ken’ichi
Nomoto, Alex V. Filippenko,
Accepted for publication in Astrophys. J.

Publications

Phase diagram of nuclear “pasta” and its
uncertainties in supernova cores,
Hidetaka Sonoda, Gentaro Watanabe, Katsuhiko Sato,
Kenji Yasuoka, Toshikazu Ebisuzaki,
Phys. Rev. C 77, 035806 (2008)

New Aspects of Heterotic-F Theory Duality,
Hirotaka Hayashi, Radu Tatar, Yukinobu Toda, Taizan
Watari, and Masahito Yamazaki,
Nucl. Phys. B 806, 224 (2008)

Isocurvature fluctuations in Affleck-Dine
mechanism and constraints on inflation,
Shinta Kasuya, Masahiro Kawasaki and Fuminobu
Takahash,
JCAP 10, 017 (2008)
Reconstruction of the primordial fluctuation
spectrum from the five-year WMAP data by
the cosmic inversion method with band-power
decorrelation analysis,
Ryo Nagata, Jun’ichi Yokoyama,
Phys. Rev. D 78, 123002 (2008)
The metamorphosis of Supernova SN2008D/
XRF080109: a link between Supernovae andGRBs/Hypernovae,
Paolo A. Mazzali, Stefano Valenti, Massimo Della Valle,
Guido Chincarini, Daniel N. Sauer, Stefano Benetti,
Elena Pian, Tsvi Piran, Valerio D’Elia, Nancy EliasRosa, Raffaella Margutti, Francesco Pasotti, L. Angelo
Antonelli, Filomena Bufano, Sergio Campana, Enrico
Cappellaro, Stefano Covino, Paolo D’Avanzo, Fabrizio
Fiore, Dino Fugazza, Roberto Gilmozzi, Deborah
Hunter, Kate Maguire, Elisabetta Maiorano, Paola
Marziani, Nicola Masetti, Felix Mirabel, Hripsime
Navasardyan, Ken’ichi Nomoto, Eliana Palazzi, Andrea
Pastorello, Nino Panagia, Leonardo J. Pellizza, Re’em
Sari, Stephen Smartt, Gianpiero Tagliaferri, Masaomi
Tanaka, Stefan Taubenberger, Nozomu Tominaga,
Carrie Trundle, Massimo Turatto,
Science 321, 1185 (2008)

59

Visitors

Asphericity in Supernova Explosions from LateTime Spectroscopy,
Keiichi Maeda, Koji Kawabata, Paolo A. Mazzali,
Masaomi Tanaka, Stefano Valenti, Ken’ichi Nomoto,Takashi Hattori, Jinsong Deng, Elena Pian, Stefan
Taubenberger, Masanori Iye, Thomas Matheson, Alexei
V. Filippenko, Kentaro Aoki, George Kosugi, Youichi
Ohyama, Toshiyuki Sasaki, Tadafumi Takata,
Science 319, 1220 (2008)

The Peculiar Type Ib Supernova 2006jc: A WCO
Wolf-Rayet Star Explosion,
N. Tominaga, M. Limongi, T. Suzuki, M. Tanaka,
K. Nomoto, K. Maeda, A. Chieffi, A. Tornambe, T.
Minezaki, Y. Yoshii, I. Sakon, T. Wada, Y. Ohyama, T.
Tanabe, H. Kaneda, T. Onaka, T. Nozawa, T. Kozasa,
K. S. Kawabata, G. C. Anupama, D.K. Sahu, U.K.
Gurugubelli, T.P. Prabhu, and J. Deng,
Astrophys. J. 687, 1208 (2008)

IPMU ANNUAL REPORT 2008

JFY2007

60

The broad line type Ic supernova SN 2007ru:
Adding to the diversity of type Ic supernovae,
D.K. Sahu, Masaomi Tanaka, G.C. Anupama, Uday K.
Gurugubelli, and Ken’ichi Nomoto,
Astrophys. J. 680, 580 (2008)
The Delay Time Distribution of Type Ia Supernovae
and the Single Degenerate Model,
Izumi Hachisu, Mariko Kato, and Ken’ichi Nomoto,
Astrophys. J. Lett. 683, L127 (2008)
Current Correlators for General Gauge Mediation,
Hirosi Ooguri, Yutaka Ookouchi, Chang-Soon Park,and Jaewon Park,
Accepted for publication in Nucl. Phys. B
Solving Cosmological Problems of Supersymmetric
Axion Models in Inflationary Universe,
Masahiro Kawasaki, Kazunori Nakayama,
Phys. Rev. D 77, 123524 (2008)

IPMU ANNUAL REPORT 2008

Upperbound on Squark Masses in GaugeMediation Model with Light Gravitino,
Junji Hisano, Minoru Nagai, Shohei Sugiyama, and T. T.
Yanagida,
Phys. Lett. B 665, 237 (2008)
Quantum Interference Effects Among Helicities at
LEP-II and Tevatron,
Matthew R. Buckley, Beate Heinemann, William
Klemm, and Hitoshi Murayama,
Phys. Rev. D 77, 113017 (2008)
Decaying D-branes and Moving Mirrors,
Tomoyoshi Hirata, Shinji Mukohyama and Tadashi
Takayanagi,
JHEP 05, 089 (2008)

Test of Anomaly Mediation at the LHC,
Shoji Asai, Takeo Moroi, T.T. Yanagida,
Phys. Lett. B 664, 185 (2008)

Metastable Vacua in Perturbed Seiberg-Witten
Theories, Part 2: Fayet-Iliopoulos Terms and Kahler
Normal Coordinates,
Joseph Marsano, Hirosi Ooguri, Yutaka Ookouchi,
Chang-Soon Park,
Nucl. Phys. B 798, 17 (2008)

Inclusive transverse mass analysis for squark andgluino mass determination,
Mihoko M. Nojiri, Yasuhiro Shimizu, Shogo Okada,Kiyotomo Kawagoe,
JHEP 06, 035 (2008)
Chemical Abundances of the Secondary Star in theBlack Hole X-ray Binary XTE J1118+480,
Jonay I. Gonzalez Hernandez, Rafael Rebolo, Garik
Israelian, Alexei V. Filippenko, Ryan Chornock,Nozomu Tominaga, Hideyuki Umeda, and Ken’ichi
Nomoto,Astrophys. J. 679, 732 (2008)
The Outermost Ejecta of Type Ia Supernovae,
Masaomi Tanaka, Paolo A. Mazzali, Stefano Benetti,
Ken’ichi Nomoto, Nancy Elias-Rosa, Rubina Kotak,
Giuliano Pignata, Vallery Stanishev, Stephan
Hachinger,
Astrophys. J. 677, 448 (2008)
Electromagnetic Properties of the Early Universe,
Keitaro Takahashi, Kiyotomo Ichiki, Naoshi Sugiyama,
Phys. Rev. D 77, 124028 (2008)
Determining the mass of a ultra-light gravitino at
LHC,
K. Hamaguchi, S. Shirai, and T.T. Yanagida,
Phys. Lett. B 663, 86 (2008)
Aspherical Properties of Hydrodynamics andNucleosynthesis in Jet-induced Supernovae,
Nozomu Tominaga,
Astrophys. J. 690, 526 (2009)
The evolution of the peculiar Type Ia supernova
SN 2005hk over 400 days,
D.K. Sahu, Masaomi Tanaka, G.C. Anupama, Koji S.
Kawabata, Keiichi Maeda, Nozomu Tominaga, Ken’ichi
Nomoto, and Paolo A. Mazzali,
Astrophys. J. 680, 580 (2008)
Young and Massive Binary Progenitors of Type Ia
Supernovae and Their Circumstellar Matter,
Izumi Hachisu, Mariko Kato, and Ken’ichi Nomoto,
Astrophys. J. 679, 1390 (2008)
nu-Process Nucleosynthesis in Population III CoreCollapse Supernovae,
Takashi Yoshida, Hideyuki Umeda, and Ken’ichi
Nomoto,Astrophys. J. 672, 1043 (2008)

Discriminating spin through quantum interference,
Matthew R. Buckley, Hitoshi Murayama, William
Klemm,Vikram Rentala,Phys. Rev. D 78, 014028 (2008)
No Evidence for Variability of Intervening
Absorption Lines toward GRB 060206:
Implications for the Mg II Incidence Problem,
Kentaro Aoki, Tomonori Totani, Takashi Hattori, Kouji
Ohta, Koji S. Kawabata, Naoto Kobayashi, Masanori
Iye, Ken’ichi Nomoto, and Nobuyuki Kawai,
Accepted for publication in Publ. Astron. Soc. Japan
Gauge Mediation with Sequestered Supersymmetry
Breaking,
Satoshi Shirai, Fuminobu Takahashi, T. T. Yanagida andKazuya Yonekura,Phys. Rev. D 78, 075003 (2008)
Constraints on the time variation of the finestructure constant by the 5-year WMAP data,
Masahiro Nakashima, Ryo Nagata, Jun’ichi Yokoyama,
Prog. Theor. Phys. 120, 1207 (2008)
Properties of newly formed dust by SN2006jc
based on near-to-mid infrared observation withAKARI,
I. Sakon, T. Wada, Y. Ohyama, D. Ishihara, T. Tanabe,
H. Kaneda, T. Onaka, N. Tominaga, M. Tanaka, T.
Suzuki, H. Umeda, K. Nomoto, T. Nozawa, T. Kozasa, T.
Minezaki, Y. Yoshii, S. Ohyabu, F. Usui, H. Matsuhara, T.
Nakagawa, and H. Murakami,
Accepted for publication in Astrophys. J.
A note on Markov type constants,
Shin-ichi Ohta and Mikael Pichot,
Accepted for publication in Arch. Math. (Basel)
Holographic Baryons: Static Properties and Form
Factors from Gauge/String Duality,
Koji Hashimoto, Tadakatsu Sasaki, and Shigeki
Sugimoto,
Prog. Theo. Phys. 120, 1093 (2008)
Observational Characteristics and Possible
Asphericity of Over-Luminous Type Ia Supernovae,
Keiichi Maeda and Koichi Iwamoto,Accepted for publication in MNRAS

Growth functions associated with Artin monoidsof finite type,
Kyoji Saito,
Proc. Japan Acad. 84, Ser. A (2008)
Bar complex, configuration spaces and finite typeinvariants for braids,
Toshitake Kohno,
Accepted for publication in Topology and its
Appliations
Tycho Brahe’s 1572 Supernova as a standard typeIa explosion revealed from its light echo spectrum,
Oliver Krause, Masaomi Tanaka, Tomonori Usuda,
Takashi Hattori, Miwa Goto, Stephan Birkmann,Ken’ichi Nomoto,
Nature 456, 617 (2008)
Implications to Sources of Ultra-high-energy
Cosmic Rays from their Arrival Distribution,
Hajime Takami and Katsuhiko Sato,
Accepted for publication in Astroparticle Physics

Publications

Optical Spectropolarimetry and Asphericity of TypeIc SN 2007gr,
Masaomi Tanaka, Koji S. Kawabata, Keiichi Maeda,
Takashi Hattori, and Ken’ichi Nomoto,
Astrophys. J. 689, 1191 (2008)

A hybrid method for determining SUSY particle
masses at the LHC with fully identified cascadedecays,Mihoko M. Nojiri , Giacomo Polesello, Daniel R. Tovey,
JHEP 05, 014 (2008)

Nonthermal neutrinos from supernovae leaving amagnetar,Shunsaku Horiuchi, Yudai Suwa, Hajime Takami,
Shin’ichiro Ando and Katsuhiko Sato,
Accepted for publication in MNRAS
Impact of Rotation on Neutrino Emission and Relic
Neutrino Background from Population III Stars,
Yudai Suwa, Tomoya Takiwaki, Kei Kotake, andKatsuhiko Sato,
Accepted for publication in Astrophys. J.

61

GALEX Spectroscopy of SN 2005ay suggests a UV
spectral uniformity among type II-P supernovae,
A. Gal-Yam, F. Bufano, T. Barlow, E. Baron, S. Benetti,
E. Cappellaro, P.J. Challis, R.S. Ellis, A.V. Filippenko,
R.J. Foley, D.B. Fox, R.P. Kirshner, D.C. Leonard, W.
Li, D. Maoz, T. Matheson, P.A. Mazzali, M. Modjaz, K.
Nomoto, E.O. Ofek, J. Simon, T. Small, G.P. Smith, M.
Turatto, S.D. Van Dyk, and L. Zampieri,
Astrophys. J. Lett. 685, L117 (2008)

Gravitational Waves as a Probe of the Gravitino
Mass,
Fuminobu Takahashi, T.T. Yanagida, and Kazuya
Yonekura,
Phys. Lett. B 664, 194 (2008)

Consistent Anti-de Sitter-Space/ConformalField-Theory Dual for a Time-Dependent Finite
Temperature System,
Shunichiro Kinoshita, Shinji Mukohyama, ShinNakamura, Kin-ya Oda,
Phys. Rev. Lett. 102, 031601 (2009)
Disordered Systems and Replica Method in AdS/
CFT,
Mitsutoshi Fujita, Yasuaki Hikida, Shinsei Ryu andTadashi Takayanagi,
JHEP 0812, 065 (2008)
Optical photometry and spectroscopy of the typeIbn supernova SN2006jc until the onset of dust
formation,
G. C. Anupama, D. K. Sahu, U. K. Gurugubelli, T. P.
Prabhu, N. Tominaga, M. Tanaka, K. Nomoto,MNRAS 392, 894 (2009)
Configuration of the central streams in the moduli
of abelian varieties,
Shushi Harashita,
Accepted for publication in the Asian Journal of
Mathematics

IPMU ANNUAL REPORT 2008

Publications

Supernova 2008D associated with the Luminous
X-ray Transient 080109: An Energetic Explosion ofa Massive Helium Star,
Masaomi Tanaka, Nozomu Tominaga, Ken’ichi
Nomoto, S. Valenti, D.K. Sahu, T. Minezaki, Y. Yoshii, M.
Yoshida, G.C. Anupama, S. Benetti, G. Chincarini, M.
Della Valle, P.A. Mazzali, E. Pian,
Accepted for publication in Astrophys. J.

12. Preprints
Conformal Inflation, Modulated Reheating and
WMAP5,
Takeshi Kobayashi and Shinji Mukohyama,
Phys. Rev. D 79, 083501 (2009)

Publications

Neutrino mixing and mass hierarchy in Gaussian
landscapes,
Lawrence J. Hall, Michael P. Salem and Taizan Watari,
Phys. Rev. D 79, 025010 (2009)
Successive extensions of minimal p-divisiblegroups,Shushi Harashita,
Accepted for publication in Journal of Pure andApplied Algebra
GeV Majorana Neutrinos in Top Decay at the LHC,
Zongguo Si and Kai Wang,
Phys. Rev. D 79, 014034 (2009)62

Apparent shape of super-spinning black holes,
Cosimo Bambi and Katherine Freese,
Phys. Rev. D 79, 043002 (2009)
Crystal Melting and Toric Calabi-Yau Manifolds,
Hirosi Ooguri and Masahito Yamazaki,
Accepted for publication in Communications inMathematical Physics
Constraints on Neutrino Masses from Weak
Lensing,
Kiyotomo Ichiki, Masahiro Takada, Tomo Takahashi,
Accepted for publication in Prog. Theor. Phys.
High-energy Cosmic-Ray Positrons from HiddenGauge-Boson Dark Matter,
Chuan-Ren Chen, Fuminobu Takahashi and T. T.
Yanagida,
Phys. Lett. B 673, 255 (2009)

IPMU ANNUAL REPORT 2008

Color Sextet Scalars at the CERN Large Hadron
Collider,Chuan-ren Chen, William L. Klemm, Vikram Rentala,Kai Wang,
Phys. Rev. D 79, 054002 (2009)

Triplet Scalars and Dark Matter at the LHC,
Pavel Fileviez Perez, Hiren Patel, Michael RamseyMusolf, Kai Wang,
Phys. Rev. D 79, 055024 (2009)
Non-Gaussianity from isocurvature perturbations,
Masahiro Kawasaki, Kazunori Nakayama, Toyokazu
Sekiguchi, Teruaki Suyama, Fuminobu Takahashi,
JCAP 11, 019 (2008)
Gamma rays and positrons from a decaying
hidden gauge boson,
Chuan-Ren Chen, Fuminobu Takahashi, T. T. Yanagida,
Phys. Lett. B 671, 71 (2009)

IPMU 07-0001
Moduli stabilization in stringy ISS models,Yu Nakayama, M. Yamazaki, T. T. Yanagida,
arXiv:0710.0001[hep-th], Phys. Lett. B 663, 281(2008)
IPMU 07-0002
Discriminating spin through quantum
interference,
Matthew R. Buckley, Hitoshi Murayama, William
Klemm, Vikram Rentala,arXiv:0711.0364[hep-ph]
IPMU 07-0003
Metastable Vacua in Perturbed Seiberg-Witten
Theories, Part 2: Fayet-Iliopoulos Terms andKahler Normal Coordinates,
Joseph Marsano, Hirosi Ooguri, Yutaka Ookouchi,
Chang-Soon Park,
arXiv:0712.3305[hep-th], Nucl. Phys. B 798, 17(2008)

Non-Gaussianity from Baryon Asymmetry,
Masahiro Kawasaki, Kazunori Nakayama, Fuminobu
Takahashi,
JCAP 01, 002 (2009)

IPMU 07-0004
Towards Unravelling the Structural Distribution of
Ultra-high-energy Cosmic Ray Sources,
Hajime Takami and Katsuhiko Sato,arXiv:0710.0767[astro-ph]

A General Analysis of Non-Gaussianity from
Isocurvature Perturbations,
Masahiro Kawasaki, Kazunori Nakayama, Toyokazu
Sekiguchi, Teruaki Suyama, Fuminobu Takahashi,
JCAP 01, 042 (2009)

IPMU 07-0005
Distortion of Ultra-high-energy Sky by Galactic
Magnetic Field,
Hajime Takami and Katsuhiko Sato,arXiv:0711.2386[astro-ph]Hilltop Non-Gaussianity,
Masahiro Kawasaki, Kazunori Nakayama, Fuminobu
Takahashi,
JCAP 01, 026 (2009)

IPMU 07-0006
Phase diagram of nuclear “pasta” and its
uncertainties in supernova cores,
Hidetaka Sonoda, Gentaro Watanabe, Katsuhiko Sato,
Kenji Yasuoka, Toshikazu Ebisuzaki,
arXiv:0712.0052[nucl-th], Phys. Rev. C 77, 035806(2008)

Cosmic rays from Leptonic Dark Matter,
Chuan-Ren Chen, Fuminobu Takahashi,
JCAP 02, 004 (2009)
Cosmological Moduli Problem from Thermal
Effects,
Kazunori Nakayama, Fuminobu Takahashi,
Phys. Lett. B 670, 434 (2009)

IPMU 07-0007
A Problem of the QCD Axion in Supergravity,
Motoi Endo, Fuminobu Takahashi, T. T. Yanagida,
arXiv:0712.1636[hep-ph], DESY 07-217: withdrawn
IPMU 07-0008
A hybrid method for determining SUSY particle
masses at the LHC with fully identified cascadedecays,Mihoko M. Nojiri, Giacomo Polesello, Daniel R. Tovey,
arXiv:0712.2718[hep-ph], JHEP 05, 014 (2008)
IPMU 07-0009
nu-Process Nucleosynthesis in Population III CoreCollapse Supernovae,
Takashi Yoshida, Hideyuki Umeda, and Ken’ichi
Nomoto,arXiv:0710.0251[astro-ph]

IPMU 07-0010
Young and Massive Binary Progenitors of Type Ia
Supernovae and Their Circumstellar Matter,
Izumi Hachisu, Mariko Kato, and Ken’ichi Nomoto,arXiv:0710.0319[astro-ph]
IPMU 07-0011
The evolution of the peculiar Type Ia supernova
SN 2005hk over 400 days,
D.K. Sahu, Masaomi Tanaka, G.C. Anupama, Koji S.
Kawabata, Keiichi Maeda, Nozomu Tominaga, Ken’ichi
Nomoto, and Paolo A. Mazzali,
arXiv:0710.3636[astro-ph]
IPMU 07-0012
The Peculiar Type Ib Supernova 2006jc: A WC Star
Explosion,
N. Tominaga, M. Limongi, T. Suzuki, M. Tanaka,
K. Nomoto, K. Maeda, A. Chieffi, A. Tornambe, T.
Minezaki, Y. Yoshii, I. Sakon, T. Wada, Y. Ohyama, T.
Tanabe, H. Kaneda, T. Onaka, T. Nozawa, T. Kozasa,
K. S. Kawabata, G. C. Anupama, D.K. Sahu, U.K.
Gurugubelli, T.P. Prabhu, and J. Deng,
arXiv:0711.4782[astro-ph]
IPMU 07-0013
Properties of newly formed dust by SN2006jc
based on near-to-mid infrared observation withAKARI,
I. Sakon, T. Wada, Y. Ohyama, D. Ishihara, T. Tanabe,
H. Kaneda, T. Onaka, N. Tominaga, M. Tanaka, T.
Suzuki, H. Umeda, K. Nomoto, T. Nozawa, T. Kozasa, T.
Minezaki, Y. Yoshii, S. Ohyabu, F. Usui, H. Matsuhara, T.
Nakagawa, and H. Murakami,
arXiv:0711.4801[astro-ph]

Preprints

Nucleosynthesis of 56Ni in wind-driven Supernova
Explosions and Constraints on the Central Engine
of Gamma-Ray Bursts,
Keiichi Maeda and Nozomu Tominaga,
Accepted for publication in MNRAS

JFY200763

The Impact of Non-Gaussian Errors on Weaklensing Surveys,
Masahiro Takada, Bhuvnesh Jain,
Accepted for publication in MNRASIPMU 07-0014
Aspherical Properties of Hydrodynamics andNucleosynthesis in Jet-induced Supernovae,
Nozomu Tominaga,
arXiv:0711.4815[astro-ph]
IPMU 07-0015
Determining the mass of a ultra-light gravitino at
LHC,
K. Hamaguchi, S. Shirai, and T.T. Yanagida,
arXiv:0712.2462[hep-ph], Phys. Lett. B 663, 86 (2008)
IPMU 07-0016
Electromagnetic Properties of the Early Universe,
Keitaro Takahashi, Kiyotomo Ichiki, Naoshi Sugiyama,
arXiv:0710.4620[astro-ph], Phys. Rev. D 77, 124028(2008)
IPMU 07-0017
Cosmic Microwave Background--Weak Lensing
Correlation: Analytical and Numerical Study ofNon-linearity and Implications for Dark Energy,
Atsushi J. Nishizawa, Eiichiro Komatsu, Naoki Yoshida,
Ryuichi, Takahashi, Naoshi Sugiyama,
arXiv:0711.1696[astro-ph]

IPMU ANNUAL REPORT 2008

Simulations of Baryon Accoustic Osccilations I:
Growth of Large-Scale Density Fluctuations,
Ryuichi Takahashi, Naoki Yoshida, et al.
MNRAS 389, 1675 (2008)

IPMU 08-0003
Asymmetry in Supernova Explosions from LateTime Spectroscopy,
Keiichi Maeda, Koji Kawabata, Paolo A. Mazzali,
Masaomi Tanaka, Stefano Valenti, Ken’ichi Nomoto,Takashi Hattori, Jinsong Deng, Elena Pian, Stefan
Taubenberger, Masanori Iye, Thomas Matheson, Alexei
V. Filippenko, Kentaro Aoki, George Kosugi, Youichi
Ohyama, Toshiyuki Sasaki, Tadafumi Takata,arXiv:0801.1100[astro-ph]
IPMU 08-0004
Early Formation of Dust in the Ejecta of Type Ib
SN 2006jc and Temperature and Mass of the Dust,
T. Nozawa, T. Kozasa, N. Tominaga, I. Sakon, M.
Tanaka, T. Suzuki, K. Nomoto, K. Maeda, H. Umeda, M.
Limongi, T. Onaka,
arXiv:0801.2015[astro-ph]

IPMU ANNUAL REPORT 2008

IPMU 08-0005
Chemical Abundances of the Secondary Star in theBlack Hole X-ray Binary XTE J1118+480,
Jonay I. Gonzalez Hernandez, Rafael Rebolo, Garik
Israelian, Alexei V. Filippenko, Ryan Chornock,Nozomu Tominaga, Hideyuki Umeda, and Ken’ichi
Nomoto,arXiv:0801.4936[astro-ph]
IPMU 08-0006
Inclusive transverse mass analysis for squark andgluino mass determination,
Mihoko M. Nojiri, Yasuhiro Shimizu, Shogo Okada,Kiyotomo Kawagoe,
arXiv:0802.2412[hep-ph], JHEP 06, 035 (2008)
IPMU 08-0007
Special Relativistic Simulations of Magneticallydominated Jets in Collapsing Massive Stars,
Tomoya Takiwaki, Kei Kotake, Katsuhiko Sato,arXiv:0712.1949v2[astro-ph]

IPMU 08-0010
Study of the top reconstruction in top-partner
events at the LHC,
Mihoko M. Nojiri and Michihisa Takeuchi,
arXiv:0802.4142[hep-ph], KEK-TH-1233, YITP-08-10

IPMU 08-0019
Conformal Gauge Mediation and Light Gravitinoof Mass M3/2 O(10) eV,
M. Ibe, Y. Nakayama and T.T. Yanagida,
arXiv:0804.0636[hep-ph]

IPMU 08-0011
Gravitational Waves as a Probe of the Gravitino
Mass,
Fuminobu Takahashi, T.T. Yanagida, and Kazuya
Yonekura,
arXiv:0802.4335[hep-ph], Phys. Lett. B 664, 194(2008)

IPMU 08-0020
New Anomalies in Topological String Theory,
Paul L. H. Cook, Hirosi Ooguri, and Jie Yang,
arXiv:0804.1120[hep-th]

IPMU 08-0012
The Connection between Gamma-Ray Bursts andExtremely Metal-Poor Stars as Nucleosynthetic
Probes of the Early Universe,
K. Nomoto, N. Tominaga, M. Tanaka, K. Maeda, H.
Umeda,
arXiv:0803.1964[astro-ph]
IPMU 08-0013
The interplay between the ’low’ and ’high’ energy
CP-violation in leptogenesis,
E. Molinaro and S. T. Petcov,
arXiv:0803.4120[hep-ph]

JFY2008
IPMU 08-0014
Orbit configuration spaces associated to discrete
subgroups of PSL(2, R),
F. R. Cohen, T. Kohno and M. A. Xicontencatl
IPMU 08-0015
Non-Gaussianity from Symmetry,
Teruaki Suyama and Fuminobu Takahashi,
arXiv:0804.0425[astro-ph], JCAP 09, 007 (2008)
IPMU 08-0016
Decaying D-branes and Moving Mirrors,
Tomoyoshi Hirata, Shinji Mukohyama and Tadashi
Takayanagi,
arXiv:0804.1176[hep-th], JHEP 05, 089 (2008)

IPMU 08-0021
Upperbound on Squark Masses in GaugeMediation Model with Light Gravitino,
Junji Hisano, Minoru Nagai, Shohei Sugiyama, and T. T.
Yanagida,
arXiv:0804.2957[hep-ph], Phys. Lett. B 665, 237(2008)
IPMU 08-0022
A Possible Solution to the Strong CP Problem,
Fuminobu Takahashi,
arXiv:0804.2478[hep-ph], Prog. Theor. Phys. 121, 711(2009)
IPMU 08-0023
Strongly Interacting Gauge Mediation at the LHC,K. Hamaguchi, E. Nakamura, S. Shirai, T.T. Yanagida,
arXiv:0804.3296[hep-ph]
IPMU 08-0024
New Aspects of Heterotic-F Theory Duality,
Hirotaka Hayashi, Radu Tatar, Yukinobu Toda, Taizan
Watari, and Masahito Yamazaki,
arXiv:0805.1057[hep-th]

IPMU 08-0028
CP violation in Bs mixing in the SUSY SU(5) GUTwith right-handed neutrinos,
Junji Hisano and Yasuhiro Shimizu,
arXiv:0805.3327[hep-ph]
IPMU 08-0029
A Measurement of Neutralino Mass at the LHC in
Light Gravitino Scenarios,
Koichi Hamaguchi, Eita Nakamura, Satoshi Shirai,
arXiv:0805.2502[hep-ph]
IPMU 08-0030
Bar complex, configuration spaces and finite typeinvariants for braids,
Toshitake Kohno

Preprints

IPMU 08-0018
Looking up at seesaw and GUT scales from TeV,
Hitoshi Murayama

IPMU 08-0027
Holographic Baryons: Static Properties and Form
Factors from Gauge/String Duality,
Koji Hashimoto, Tadakatsu Sasaki, and Shigeki
Sugimoto,
arXiv:0806.3122[hep-th]

IPMU 08-0031
Extremal C=(2,2) 2D Conformal Field Theories andConstraints of Modularity,
Matthias R. Gaberdiel, Sergei Gukov, Christoph A.
Keller, Gregory W. Moore, and Hirosi Ooguri,
arXiv:0805.4216[hep-th]
IPMU 08-0032
Isocurvature fluctuations in Affleck-Dine
mechanism and constraints on inflation models,Shinta Kasuya, Masahiro Kawasaki and Fuminobu
Takahashi,
arXiv:0805.4245[hep-ph], JCAP 10, 017 (2008)

65

IPMU 08-0002
The Role of Type Ia Supernovae in Chemical
Evolution I: Lifetime of Type Ia Supernovae andGalactic Supernova Rates,
Chiaki Kobayashi and Ken’ichi Nomoto,arXiv:0801.0215[astro-ph]

IPMU 08-0009
Test of Anomaly Mediation at the LHC,
Shoji Asai, Takeo Moroi, T.T. Yanagida,
arXiv:0802.3725[hep-ph], Phys. Lett. B 664, 185(2008)

IPMU 08-0017
Quantum Interference Effects Among Helicities at
LEP-II and Tevatron,
Matthew R. Buckley, Beate Heinemann, William
Klemm, and Hitoshi Murayama,
arXiv:0804.0476[hep-ph], Phys. Rev. D 77, 113017(2008)

IPMU 08-0033
Type IIB Flux Vacua at Large Complex Structure,
Tudor Dan Dimofte,
arXiv:0806.0001[hep-th]
IPMU 08-0034
Electron and Photon Energy Deposition in
Universe,
Toru Kanzaki and Masahiro Kawasaki,arXiv:0805.3969[astro-ph]

IPMU 08-0025
Solving Cosmological Problems of Supersymmetric
Axion Models in Inflationary Universe,
Masahiro Kawasaki, Kazunori Nakayama,
arXiv:0802.2487[hep-ph], Phys. Rev. D 77, 123524(2008)

IPMU 08-0035
GUT Relations from String Theory
Compactifications,Radu Tatar and Taizan Watari,
arXiv:0806.0634[hep-th]

IPMU 08-0026
Big-Bang Nucleosynthesis and Gravitino,
Masahiro Kawasaki, Kazunori Kohri, Takeo Moroi, Akira
Yotsuyanagi,
arXiv:0804.3745[hep-ph]

IPMU 08-0036
Anisotropic Inflation from Vector Impurity,
Sugumi Kanno, Masashi Kimura, Jiro Soda, Shuichiro
Yokoyama,
arXiv:0806.2422[astro-ph]

IPMU ANNUAL REPORT 200864

Preprints

IPMU 08-0001
Hidden Grassmann Structure in the XXZ Model II:
Creation Operators,
H. Boos, M. Jimbo, T. Miwa, F. Smirnov and Y.
Takeyama,
arXiv:0801.1176[hep-th]

IPMU 08-0008
Conformal Supersymmetry Breaking and
Dynamical Tuning of the Cosmological Constant,
M. Ibe, Y. Nakayama, and T.T. Yanagida,
arXiv:0802.2753[hep-th]!

IPMU 07-0018
The Outermost Ejecta of Type Ia Supernovae,
Masaomi Tanaka, Paolo A. Mazzali, Stefano Benetti,
Ken’ichi Nomoto, Nancy Elias-Rosa, Rubina Kotak,
Giuliano Pignata, Vallery Stanishev, Stephan
Hachinger,
arXiv:0712.2823[astro-ph]

IPMU 08-0040
Mass Measurement of the Decaying Bino at the
LHC,
S. Asai, O. Jinnouchi, T. Moroi, S. Shirai and T.T.
Yanagida
IPMU 08-0041
Unified origin of baryon and dark matter,
Ryuichiro Kitano, Hitoshi Murayama, Michael Ratz

66

IPMU 08-0042
Determining Spin through Quantum AzimuthalAngle Correlations,Matt Buckley, S.Y. Choi, K. Mawatari, H. Murayama
IPMU 08-0043
The Delay Time Distribution of Type Ia Supernovae
and the Single Degenerate Model,
Izumi Hachisu, Mariko Kato, and Ken’ichi Nomoto

IPMU ANNUAL REPORT 2008

IPMU08-0044
The broad line type Ic supernova SN 2007ru:
Adding to the diversity of type Ic supernovae,
D.K. Sahu, Masaomi Tanaka, G.C. Anupama, Uday K.
Gurugubelli, and Ken’ichi Nomoto

IPMU 08-0048
Supernova 2008D associated with the Luminous
X-ray Transient 080109: An Energetic Explosion ofa Massive Helium Star,
Masaomi Tanaka, Nozomu Tominaga, Ken’ichi
Nomoto, S. Valenti, D.K. Sahu, T. Minezaki, Y. Yoshii, M.
Yoshida, G.C. Anupama, S. Benetti, G. Chincarini, M.
Della Valle, P.A. Mazzali, E. Pian,
Astrophys. J. in press, arXiv:0807.1674[astro-ph]
IPMU 08-0049
The metamorphosis of Supernova SN2008D /XRF080109: a link between Supernovae and GRBs
/ Hypernovae,
Paolo A. Mazzali, Stefano Valenti, Massimo Della Valle,
Guido Chincarini, Daniel N. Sauer, Stefano Benetti,
Elena Pian, Tsvi Piran, Valerio D’Elia, Nancy EliasRosa, Raffaella Margutti, Francesco Pasotti, L. Angelo
Antonelli, Filomena Bufano, Sergio Campana, Enrico
Cappellaro, Stefano Covino, Paolo D’Avanzo, Fabrizio
Fiore, Dino Fugazza, Roberto Gilmozzi, Deborah
Hunter, Kate Maguire, Elisabetta Maiorano, Paola
Marziani, Nicola Masetti, Felix Mirabel, Hripsime
Navasardyan, Ken’ichi Nomoto, Eliana Palazzi, Andrea
Pastorello, Nino Panagia, Leonardo J. Pellizza, Re’em
Sari, Stephen Smartt, Gianpiero Tagliaferri, Masaomi
Tanaka, Stefan Taubenberger, Nozomu Tominaga,
Carrie Trundle, Massimo Turatto,
Science 321, 1185 (2008), arXiv:0807.1695[astro-ph]

IPMU 08-0045
Optical Spectropolarimetry and Asphericity of TypeIc SN 2007gr,
Masaomi Tanaka, Koji S. Kawabata, Keiichi Maeda,
Takashi Hattori, and Ken’ichi Nomoto,
Astrophys. J. in press, arXiv:0806.1589[astro-ph]

IPMU 08-0050
Non-Gaussianity from isocurvature perturbations,
Masahiro Kawasaki, Kazunori Nakayama, Toyokazu
Sekiguchi, Teruaki Suyama, Fuminobu Takahashi,
arXiv:0808.0009[astro-ph], JCAP 11, 019 (2008)

IPMU 08-0046
Multi-Dimensional Simulations of Radiative
Transfer in Aspherical Core-Collapse Supernovae,
Masaomi Tanaka, Keiichi Maeda, Paolo A. Mazzali, andKen’ichi Nomoto,arXiv:0806.1590[astro-ph]

IPMU 08-0051
Handling jets + missing E T channel using inclusive
m T2 ,
Mihoko M. Nojiri, Kazuki Sakurai, Yasuhiro Shimizu,
Michihisa Takeuchi,
arXiv:0808.1094[hep-ph]
IPMU 08-0052
Superconformal Chern-Simons Theories andSquashed S7,Hirosi Ooguri and Chang-Soon Park,
arXiv:0808.0500[hep-th]

IPMU 08-0054
Recursion Relations, Generating Functions, andUnitarity Sums in N = 4 SYM Theory,
Henriette Elvang, Daniel Z. Freedman, Michael
Kiermaier,
arXiv:0808.1720[hep-ph]
IPMU 08-0055
RHIC as a testing ground for time-dependent AdS/
CFT,
Shunichiro Kinoshita, Shinji Mukohyama, ShinNakamura, Kin-ya Oda
IPMU 08-0056
Nonlinear superhorizon perturbations of noncanonical scalar field,
Yu-ichi Takamizu and Shinji Mukohyama,
arXiv:0810.0746[gr-qc]
IPMU 08-0057
A Case of Subdominant/Suppressed “High Energy”
Contribution to the Baryon,
E. Molinaro, S.T. Petcov,
arXiv:0808.3534[hep-ph]
IPMU 08-0058
Gamma rays and positrons from a decaying
hidden gauge boson,
Chuan-Ren Chen, Fuminobu Takahashi and T. T.
Yanagida,
arXiv:0809.0792[hep-ph], Phys. Lett. B 671, 71 (2008)
IPMU 08-0059
The Night before the LHC ---thoughts about
expectations in the early stage and beyond---,Mihoko M. Nojiri,
Proc. of SUSY08, to appear
IPMU 08-0060
Conformal inflation, modulated reheating and
WMAP5,
Takeshi Kobayashi and Shinji Mukohyama,
arXiv:0810.0810[hep-th]
IPMU 08-0061
Non-Gaussianity from Baryon Asymmetry,
Masahiro Kawasaki, Kazunori Nakayama, Fuminobu
Takahashi,
arXiv:0809.2242[hep-ph], JCAP 01, 002 (2009)

IPMU 08-0062
Toric Calabi-Yau four-folds dual to Chern-Simonsmatter theories,
Kazushi Ueda and Masahito Yamazaki,
arXiv:0808.3768[hep-ph]
IPMU 08-0063
Octonions, G_ 2 and generalized Lie 3-algebras,
Masahito Yamazaki,
arXiv:0809.1650[hep-ph]
IPMU 08-0064
Subaru and Keck Observations of The Peculiar
Type Ia Supernova 2006gz at Late-Phases,
Keiichi Maeda, Koji Kawabata, Weidong Li, Masaomi
Tanaka, Paolo A. Mazzali, Takashi Hattori, Ken’ichi
Nomoto, Alex V. Filippenko,
Astrophys. J. in press, arXiv:0808.0138[astro-ph]
IIPMU 08-0065
Injection of Short-Lived Radionuclides into the
Early Solar System from a Faint Supernova with
Mixing-Fallback,
A. Takigawa, J. Miki, S. Tachibana, G. R. Huss, N.
Tominaga, H. Umeda, and K. Nomoto,
Astrophys. J. in press, arXiv:0808.1441[astro-ph]
IPMU 08-0066
No Evidence for Variability of Intervening
Absorption Lines toward GRB 060206:
Implications for the Mg II Incidence Problem,
IPMU08-0066 Kentaro Aoki, Tomonori Totani,
Takashi Hattori, Kouji Ohta, Koji S. Kawabata, Naoto
Kobayashi, Masanori Iye, Ken’ichi Nomoto, andNobuyuki Kawai,
Publ. Astron. Soc. Japan in press,
arXiv:0808.4157[astro-ph]

Preprints

Preprints

IPMU 08-0039
A Holographic Dual of Bjorken Flow,
Shunichiro Kinoshita, Shinji Mukohyama, ShinNakamura, Kin-ya Oda

IPMU 08-0053
Gauge Mediation with Sequestered Supersymmetry
Breaking,
Satoshi Shirai, Fuminobu Takahashi, T. T. Yanagida andKazuya Yonekura,Phys. Rev. D 78, 075003 (2008),
arXiv:0808.0848[hep-ph]67

IPMU 08-0038
Current Correlators for General Gauge Mediation,
Hirosi Ooguri, Yutaka Ookouchi, Chang-Soon Park,and Jaewon Park,
arXiv:0806.4733[hep-th]

IPMU 08-0047
GALEX Spectroscopy of SN 2005ay suggests a UV
spectral uniformity among type II-P supernovae,
A. Gal-Yam, F. Bufano, T. Barlow, E. Baron, S. Benetti,
E. Cappellaro, P.J. Challis, R.S. Ellis, A.V. Filippenko,
R.J. Foley, D.B. Fox, R.P. Kirshner, D.C. Leonard, W.
Li, D. Maoz, T. Matheson, P.A. Mazzali, M. Modjaz, K.
Nomoto, E.O. Ofek, J. Simon, T. Small, G.P. Smith, M.
Turatto, S.D. Van Dyk, and L. Zampieri
Astrophys. J. Lett. 685, L117 (2008),
arXiv:0806.3276[astro-ph]

IPMU 08-0067
Supernova Nucleosynthesis in the Early Universe,
Nozomu Tominaga, Hideyuki Umeda, Keiichi Maeda,
Ken’ichi Nomoto, Nobuyuki Iwamoto,arXiv:0809.4242[astro-ph]
IPMU 08-0068
GeV Majorana Neutrinos in Top Decay at the LHC,
Zongguo Si and Kai Wang,
arXiv:0810.5266[hep-ph]
IPMU 08-0069
A General Analysis of Non-Gaussianity from
Isocurvature Perturbations,
IPMU08-0069 Masahiro Kawasaki, Kazunori Nakayama,
Toyokazu Sekiguchi, Teruaki Suyama, Fuminobu
Takahashi,
arXiv:0810.0208[astro-ph], JCAP 01, 042 (2009)
IPMU 08-0070
The Impact of Non-Gaussian Errors on Weaklensing Surveys,
Masahiro Takada, Bhuvnesh Jain,
submitted to MNRAS, arXiv:0810.4170[astro-ph]

IPMU ANNUAL REPORT 2008

IPMU 08-0037
Growth series for Artin monoids of finite type,
Kyoji Saito

IPMU 08-0074
The boundary state from open string fields,
Michael Kiermaier, Yuji Okawa, Barton Zwiebach,arXiv:0810.1737[hep-th]
IPMU 08-0075
Evolution of Newly Formed Dust in Population
III Supernova Remnants and Its Impact on the
Elemental Composition of Population II.5 Stars,
Takaya Nozawa, Takashi Kozasa, Asao Habe, Eli Dwek,
Hideyuki Umeda, Nozomu Tominaga, Keiichi Maeda,
Ken’ichi Nomoto,
IAU Symposium 255 “Low-Metallicity Star Formation:
From the First Stars to Dwarf Galaxies”, Rapallo, June
2008, http://arxiv.org/abs/0809.4369
IPMU 08-0076
Neutrino mixing and mass hierarchy in Gaussian
landscapes,
Lawrence J. Hall, Michael P. Salem and Taizan Watari,
arXiv:0810.2561[hep-th]
IPMU 08-0077
Positron/Gamma-Ray Signatures of Dark Matter
Annihilation and Big-Bang Nucleosynthesis,
Junji Hisano, Masahiro Kawasaki, Kazunori Kohri,
Kazunori Nakayama,
arXiv:0810.1892[hep-ph]

IPMU ANNUAL REPORT 2008

IPMU 08-0078
Noncommutative resolutuion, F-blowups andD-modules,
Yukinobu Toda and Takehiko Yasuda,
arXiv:0810.1804[math]
IPMU 08-0079
A note on Markov type constants,
Shin-ichi Ohta and Mikael Pichot,
arXiv Math.

IPMU 08-0082
Gravity Mediation of Supersymmetry Breaking
with Dynamical Metastability,
Izawa K.-I., Fuminobu Takahashi, T.T. Yanagida andKazuya Yonekura,
arXiv:arXiv:0810.5413[hep-ph]
IPMU 08-0083
Constraints on Neutrino Masses from Weak
Lensing,
Kiyotomo Ichiki, Masahiro Takada, Tomo Takahashi,
http://arxiv.org/abs/0810.4921
IPMU 08-0084
Color Sextet Scalars at the CERN Large Hadron
Collider,Chuan-ren Chen, William L. Klemm, Vikram Rentala,Kai Wang,arXiv:0811.2105[hep-ph]
IPMU 08-0085
Cosmological Moduli Problem from Theremal
Effects,
Kazunori Nakayama and Fuminobu Takahashi,
arXiv:0811.0444[hep-ph], Phys. Lett. B 670, 434(2009)
IPMU 08-0086
High-energy Cosmic-Ray Positrons from HiddenGauge-Boson Dark Matter,
Chuan-Ren Chen, Fuminobu Takahashi and T. T.
Yanagida,
arXiv:0811.0477[hep-ph], Phys. Lett. B 673, 255(2009)
IPMU 08-0087
Crystal Melting and Toric Calabi-Yau Manifolds,
Hirosi Ooguri and Masahito Yamazaki,
arXiv:0811.2801[hep-th]
IPMU 08-0088
Decaying Dark Matter Baryons in a Composite
Messenger Model,
Koichi Hamaguchi, Eita Nakamura, Satoshi Shirai, andT.T.Yanagida,
arXiv:0811.0737[hep-ph]

IPMU 08-0090
Observational Characteristics and Possible
Asphericity of Over-Luminous Type Ia Supernovae,
Keiichi Maeda and Koichi Iwamoto,Monthly Notices of the Royal Astronomical Society inpress., arXiv:0811.2095[astro-ph]
IPMU 08-0091
Triplet Scalars and Dark Matter at the LHC,
Pavel Fileviez Perez, Hiren Patel, Michael RamseyMusolf, Kai Wang,
arXiv:0811.3957[hep-ph]
IPMU 08-0092
Decaying Hidden Gauge Boson and the PAMELA
and ATIC/PPB-BETS Anomalies,
Chuan-Ren Chen, Mihoko M. Nojiri, Fuminobu
Takahashi, T. T. Yanagida,
arXiv:0811.3357[astro-ph], accepted for publication in
Prog. Theor. Phys.
IPMU 08-0093
Energy-Dependent Speeds of Light for Cosmic-Ray
Observatories,
Simon DeDeo, Chanda Prescod-Weinstein,Phys. Rev. D, arXiv:0811.1999[astro-ph]
IPMU 0800095
Apparent shape of super-spinning black holes,
Cosimo Bambi and Katherine Freese,arXiv:0812.1328[astro-ph]
IPMU 08-0096
Implications of primordial black holes on the firststars and the origin of the super-massive black
holes,
Cosimo Bambi, Douglas Spolyar, Alexander D. Dolgov,
Katherine Freese and Marta Volonteri,
arXiv:0812.0585[astro-ph]
IPMU 08-0097
Effectine Boost Factor of Dark Matter Annihilation,
M. Ibe, H. Murayama, and T.T. Yanagida
IPMU 08-0098
Gravity with Perturbative Constraints: Dark Energy
Without New Degrees of Freedom,
Alan Cooney, Simon DeDeo, Dimitrios Psaltis,
Phys. Rev. D, arXiv:0811.3635[astro-ph]
IPMU 08-0099
Impact of Rotation on Neutrino Emission and Relic
Neutrino Background from Population III Stars,
Yudai Suwa, Tomoya Takiwaki, Kei Kotake, andKatsuhiko Sato,
Astrophys. J., arXiv:0807.0267[astro-ph]

IPMU 08-0100
Nonthermal neutrinos from supernovae leaving amagnetar,Shunsaku Horiuchi, Yudai Suwa, Hajime Takami,
Shin’ichiro Ando and Katsuhiko Sato,MNRAS, arXiv:0807.0267[astro-ph]
IPMU 08-0101
Implications to Sources of Ultra-high-energy
Cosmic Rays from their Arrival Distribution,
Hajime Takami and Katsuhiko Sato,
JCAP, arXiv:0807.3442[astro-ph]
IPMU 08-0102
Cross-Correlation between UHECR Arrival
Distribution and Large-Scale Structure,
Hajime Takami, Takahiro Nishimichi, Kazuhiro Yahata,
and Katsuhiko Sato,
JCAP, arXiv:0812.0424[astro-ph]

Preprints

IPMU 08-0073
Subaru and Keck Observations of the Peculiar
Type Ia Supernova 2006gz at Late Phases,
Keiichi Maeda, Koji Kawabata, Weidong Li, Masaomi
Tanaka, Paolo A. Mazzali, Takashi Hattori, Ken’ichi
Nomoto, Alex V. Filippenko,
Astrophys. J. in press, arXiv:0808.0138[astro-ph]

IPMU 08-0081
A Realistic Extension of Gauge-Mediated SUSYBreaking Model with Superconformal Hidden
Sector,
Masaki Asano, Junji Hisano, Sohei Sugiyama, andTakashi Okada

IPMU 08-0089
Hidden Grassmann Structure in the XXZ Model III:
Introducing Matsubara direction,
M. Jimbo, T. Miwa, F. Smirnov

IPMU 08-0103
Geodesic automata and growth functions for Artin
monoids of finite type,
Makoto Fuchiwaki, Michihiko Fujii, Kyoji Saito andAhunsuke Tuchioka
IPMU 08-0104
Configuration of the central streams in the moduli
of abelian varieties,
Shushi Harashita
IPMU 08-0105
Successive extensions of minimal p-divisiblegroups,Shushi Harashita

69

68

Preprints

IPMU 08-0072
Hilltop Non-Gaussianity,
Masahiro Kawasaki, Kazunori Nakayama, Fuminobu
Takahashi,
arXiv:0810.1585[hep-ph], JCAP 01, 026 (2009)

IPMU 08-0080
Disordered Systems and Replica Method in AdS/
CFT,
Mitsutoshi Fujita, Yasuaki Hikida, Shinsei Ryu andTadashi Takayanagi,
arXiv:0810.5394[hep-th]

IPMU 08-0106
Generic Newton polygons of Ekedahl-Oort strata:
Oort’s conjecture,
Shushi Harashita
IPMU 08-0107
Origin and Nature of Dust in the Early Universe,“Cosmic Dust - Near and Far”, Heidelberg, September
2008,
Takaya Nozawa, Takashi Kozasa, Hideyuki Umeda,
Hiroyuki Hirashita, Keiichi Maeda, Ken’ichi Nomoto,
Nozomu Tominaga, Asao Habe, Eli Dwek, Tsutomu T.
Takeuchi, Takako T. Ishii,
http://arxiv.org/abs/0812.1448
IPMU 08-0108
Tycho Brahe’s 1572 Supernova as a standard typeIa explosion revealed from its light echo spectrum,
Oliver Krause, Masaomi Tanaka, Tomonori Usuda,
Takashi Hattori, Miwa Goto, Stephan Birkmann,Ken’ichi Nomoto,
Nature 456, 617-619 (2008), arXiv:0810.5106[astroph]

IPMU ANNUAL REPORT 2008

IPMU 08-0071
Cosmic rays from Leptonic Dark Matter,
Chuan-Ren Chen and Fuminobu Takahashi,
arXiv:arXiv:0810.4110[hep-ph], JCAP 02, 004 (2009)

70

IPMU 08-0112
Neutrino Signals from Annihilating/Decaying Dark
Matter in the Light of Recent Measurements of
Cosmic Ray Electron/Positron Fluxes,
Junji Hisano, Masahiro Kawasaki, Kazunori Kohri andKazunori Nakayama,
arXiv:9812.0219[hep-ph]
IPMU 08-0113
Dark Matter Model Selection and the ATIC/PPBBETS anomaly,
Chuan-Ren Chen, Koichi Hamaguchi, Mihoko Nojiri,
Fuminobu Takahashi, Shoji Torii,
arXiv:0812.4200[astro-ph], JCAP 05, 015 (2009)
IPMU 08-0114
Tensors, non-Gaussianities, and the future ofpotential reconstruction,
Brian A. Powell, Konstantinos Tzirakis, William H.
Kinney,arXiv:0812.1797[astro-ph]

IPMU ANNUAL REPORT 2008

IPMU 0800115
Cosmic Ray Positron and Electron Excess from
Hidden-Fermion Dark Matter Decays,
Koichi Hamaguchi, Satoshi Shirai, and T. T. Yanagida
IPMU 08-0116
Fermionic formulas for eigenfunctions of thedifference Toda Hamiltonian,
B. Feigin, E. Feigin, M. Jimbo, E. Mukhin, T. Miwa,
arXiv:0812.2306[math]

IPMU08-0119
Constraints on scalar-tensor models of dark energy
from observational and local gravity tests,
Shinji Tsujikawa, Kotub Uddin, Shuntaro Mizuno, Reza
Tavakol, Jun’ichi Yokoyama,
Phys. Rev. D 77, 103009 (2008),
arXiv:0803.1106[astro-ph]
IPMU08-0120
Affleck Dine leptogenesis via multiple flat
directions,Kohei Kamada, Jun’ichi Yokoyama,
Phys. Rev. D 78, 043502 (2008),
arXiv:0803.1106[hep-ph]
IPMU08-0121
Inflation at the GUT scale in a Higgsless universe,
Nemanja Kaloper, Lorenzo Sorbo, Jun’ichi Yokoyama,
Phys. Rev. D 78, 043527 (2008),
arXiv:0803.3809[hep-th]
IPMU08-0122
Probing reheating temperature of the universe
with gravitational wave background,
Kazunori Nakayama, Shun Saito, Yudai Suwa, Jun’ichi
Yokoyama,
JCAP 06, 020 (2008), arXiv:0804.1827[astro-ph]
IPMU08-0123
Single-field inflation, anomalous enhancement ofsuperhorizon fluctuations, and non-Gaussianity inprimordial black hole formation,
Ryo Saito, Jun’ichi Yokoyama, Ryo Nagata,
JCAP 06, 024 (2008), arXiv:0804.3470[astro-ph]
IPMU08-0124
Reconstruction of the primordial fluctuation
spectrum from the five-year WMAP data by
the cosmic inversion method with band-power
decorrelation analysis,
Ryo Nagata, Jun’ichi Yokoyama,
Phys. Rev. D78, 123002 (2008),
arXiv:0809.4537[astro-ph]

IPMU09-0001
Nucleosynthesis of 56Ni in wind-driven Supernova
Explosions and Constraints on the Central Engine
of Gamma-Ray Bursts,
Keiichi Maeda and Nozomu Tominaga,
MNRAS in press, arXiv:0901.0410[astro-ph]
IPMU09-0002
Fractional Quantum Hall Effect via Holography:
Chern-Simons, Edge States, and Hierarchy,
Mitsutoshi Fujita, Wei Li, Shinsei Ryu, and Tadashi
Takayanagi
IPMU09-0003
Split-UED and Dark Matter,
Seong Chan Park and Jing Shu,arXiv:0901.0720[hep-ph]
IPMU09-0004
Geometry As Seen By String Theory,
Hirosi Ooguri
IPMU09-0005
Decaying gravitino dark matter and an upperbound on the gluino mass,
Koichi Hamaguchi, Fuminobu Takahashi, Tsutomu
Yanagida,
arXiv:0901.2168[hep-ph], Phys. Lett. B 677, 59 (2009)
IPMU09-0006
Ghost condensate and generalized second law,
Shinji Mukohyama,
arXiv:0901.3595 [hep-th]
IPMU09-0007
Strongly Coupled Semi-Direct Mediation ofSupersymmetry Breaking,
K.-I. Izawa, Y. Nakai,arXiv:0812.4089[hep-ph]
IPMU09-0008
Cosmic Rays from Dark Matter Annihilation and
Big-Bang Nucleosynthesis,
Junji Hisano, Masahiro Kawasak, Kazunori Kohri, Takeo
Moroi and Kazunori Nakayama,
arXiv:0901.3582[hep-ph]
IPMU09-0009
Circumventing the eta problem,
Damien Easson and Ruth Gregory,arXiv:0902.1798 [hep-th]

IPMU09-0010
Nuclear Force from String Theory,
Koji Hashimoto, Tadakatsu Sakai, Shigeki Sugimoto
IPMU09-0011
Discriminating Electroweak-ino Parameter
Ordering at the LHC and Its Impact on LFVStudies,Junji Hisano, Mihoko M. Nojiri, Warintorn
Sreethawong,arXiv:0812.4496[hep-ph]
IPMU09-0012
A Complete Analysis of ’Flavored’ Electric Dipole
Moments in Supersymmetric Theories,
Junji Hisano, Minoru Nagai, Paride Paradisi,
arXiv:0812.4283[hep-ph]
IPMU09-0013
Subaru Weak Lensing Study of 30 LoCuSS Galaxy
Clusters,
Nobuhiro Okabe, Masahiro Takada, Keiichi Umetsu,
Toshifumi Futamase, Graham P. Smith

Preprints

IPMU 08-0111
Optical photometry and spectroscopy of the typeIbn supernova SN2006jc until the onset of dust
formation,
G. C. Anupama, D. K. Sahu, U. K. Gurugubelli, T. P.
Prabhu, N. Tominaga, M. Tanaka, K. Nomoto,MNRAS, arXiv:0811.0060[astro-ph]

IPMU08-0118
Gravitational Decay of A Hidden Scalar Dark
Matter and the ATIC/PPB-BETS excess,Eiichiro Komatsu and Fuminobu Takahashi,
arXiv:0901.1915[astro-ph]

IPMU08-0125
Constraints on the time variation of the finestructure constant by the 5-year WMAP data,
Masahiro Nakashima, Ryo Nagata, Jun’ichi Yokoyama,
Prog. Theo. Phys. 120, 1207 (2008),
arXiv:0810.1098[astro-ph]

IPMU09-0014
Codimension-3 Singularities and Yukawa
Couplings in F-theory,
Hirotaka Hayashi, Teruhiko Kawano, Radu Tatar andTaizan Watari,
arXiv:0901.4941[hep-th]
IPMU09-0015
Towards a Categorical Construction of Lie
Algebras,
Kyoji Saito,
Advanced Studies in Pure Mathematics 50, 101 (2008),
http://member.ipmu.jp/kyoji.saito/towards.pdf

71

Preprints

IPMU 08-0110
Nucleosynthesis in Electron Capture Supernovaeof AGB Stars,
S. Wanajo, K. Nomoto, H.-Th. Janka, F. S. Kitaura, B.
Mueller,
Astrophys. J., arXiv:0810.3999[astro-ph]

IPMU08-0117
New Limits on Sterile Neutrinos from Suzaku
Observations of the Ursa Minor Dwarf Spheroidal
Galaxy,Michael Loewenstein, Alexander Kusenko, Peter L.
Biermann,
Astrophys. J., arXiv:0812.2710[astro-ph]

IPMU09-0016
Limit Elements in the Configuration Algebra for a
Discrete Group,
Kyoji Saito,
Publ. RIMSIPMU09-0017
From Primitive Forms to Frobenius Manifolds,
Kyoji Saito and Atsushi Takahashi
IPMU09-0018
Triangulated Categories of Matrix Factorizations
for Regular Systems of Weights with ε = -1,
Hiroshige Kajiura, Kyoji Saito, and Atsushi Takahashi
IPMU09-0019
Geodesic automata and growth functions for Artin
monoids of finite type,
Makoto Fuchiwaki, Michihiko Fujii, Kyoji Saito andShunske Tsuchioka

IPMU ANNUAL REPORT 2008

IPMU 08-0109
Supernova Nucleosynthesis and Extremely MetalPoor Stars,“ORIGIN OF MATTER AND EVOLUTION OF GALAXIES”,
Sapporo, December 2007,
Nozomu Tominaga, Hideyuki Umeda, Keiichi Maeda,
Nobuyuki Iwamoto, Ken’ichi Nomoto,
http://arxiv.org/abs/0810.0157

72

IPMU09-0030
Relating Field Theories via Stochastic
Quantization,
Robbert Dijkgraaf, Domenico Orlando, Susanne Reffert

Public Lectures

IPMU09-0022
A universal inequality for CFT and quantum
gravity,
Simeon Hellerman

IPMU09-0031
Thermodynamic and dynamical stability of FreundRubin compactification,
Shunichiro Kinoshita and Shinji Mukohyama

IPMU09-0023
Dark matter and collider phenomenology of splitUED,
Chuan-Ren Chen, Mihoko Nojiri, Seong Chan Park,
Jing Shu, Michihisa Takeuchi

IPMU09-0032
ABJM Theory with Flavors and FQHE,
Yasuaki Hikida, Wei Li and Tadashi Takayanagi

IPMU09-0024
Nambu-Goldstone Dark Matter and Cosmic Ray
Electron and Positron Excess,Masahiro Ibe, Yu Nakayama, Hitoshi Murayama,
Tsutomu Yanagida
IPMU09-0025
Emergent Calabi-Yau Geometry,
Hirosi Ooguri and Masahito Yamazaki
IPMU09-0026
Stop and Decay of Long-lived Charged Massive
Particles at the LHC detectors,
Shoji Asai, Koichi Hamaguchi, and Satoshi Shirai
IPMU09-0027
Decaying Hidden Gaugino as a Source of PAMELA/ATIC Anomalies,
Satoshi Shirai, Fuminobu Takahashi, T.T.Yanagida
arXiv:0902.4770[hep-ph], Phys. Lett. B 675, 73 (2009)
PMU09-0028
Curve counting theories via stable objects I. DT/PT
correspondence,
Yukinobu Toda

IPMU ANNUAL REPORT 2008

We make strong efforts for publicizing our mission and the outcome of IPMU research
activities. We also put strong emphasis on outreach program for general public. Not only theseare our obligation to tax payers, but more importantly, we like to share our exciting ideas forsolving the mystery of the universe and how we are making progress with others.

IPMU09-0033
Axion braneworld cosmology,
Cosimo Bambi, Masahiro Kawasaki, Federico R. Urban

Director Murayama gave a lecture “Is There an End to the Universe?” on July 12, 2008
on Kashiwa Campus. Audience of more than 300, mostly from Kashiwa area and ranging
from teen agers to their eighties, enthusiastically listened to one hour lecture and participatedin subsequent one hour session of questions and answers. Encouraged by the success,we organized another of his public lecture on the same topic on January 24, 2008 at the
Yayoi Hall of Hongo Campus. An audience of 300, this time mostly of Tokyo area, attended.
Director Murayama gave another public lecture “The Mystery of the Missing Antimatter” on
two occasions, once on October 24, 2008 at the Kashiwa Campus Open House and other at
Miraikan, Tokyo, during an event called Science Agora 2008 during November 22-24, 2008.

IPMU09-0034
Growth functions for Artin monoids,
Kyoji Saito
IPMU09-0036
Coset Construction for Duals of Non-relativistic
CFTs,
Sakura Schafer-Nameki, Masahito Yamazaki, Kentaroh
Yoshida73

Preprints

IPMU09-0021
Reply to “A note on the innocuous implicationsof a minimum length in quantum gravity” by P.H.
Frampton,
Cosimo Bambi and Katherine Freese,arXiv:0902.2647[hep-th]

IPMU09-0029
Dust in Supernovae; Formation and Evolution,
Takashi Kozasa, Takaya Nozawa, Nozomu Tominaga,
Hideyuki Umeda, Keiichi Maeda, Ken’ichi Nomoto,Contribution to “Cosmic Dust - Near and Far”,
Heidelberg, September 2008

IPMU09-0037
Neutrinoless Double Beta Decay and H ±± → l’ ±l ±Decays in the Higgs Triplet Model,
S.T. Petcov, H. Sugiyama and Y. Takanishi
IPMU09-0038
Improved Predictions for Higgs PT at the Tevatronand the LHC,
Qing-Hong Cao, Chuan-Ren Chen, Carl Schmidt andC.-P. Yuan

■ Figure 22: Hitoshi Murayama’s public lecture at Kashiwa campus on July 12, 2008. The lecture was followed
by a question and answer session.

We organized a series of five public lectures in an informal cafe-style at the Tama Rokuto
Science Museum, Tokyo, jointly with the museum. “Science Cafe - Universe” covered the topics
of “The Universe: Present, Past, and Future” by N. Sugiyama on February 14, “Birth of the
Universe and Inflation Theory” by K. Sato on February 21, “The Universe Explored by Neutrino”
by K. Inoue on February 28, “The Mystery of the Missing Antimatter: Kobayashi-Masukawa
Theory and its Limitation” by H. Murayama on March 7, “Black Hole and the Crisis of Causality”
by H. Ooguri on March 14.
IPMU ANNUAL REPORT 2008

IPMU09-0020
Runaway Dynamics and Supersymmetry Breaking,Izawa K.-I., Fuminobu Takahashi, T.T.Yanagida, Kazuya
Yonekura

Outreach and Public Communications

13.

Outreach andPublic Communications

Video Clips

We published “IPMU NEWS” magazine five times, covering a wide range of news at IPMU
such as hosted conferences and seminars, research hightlight, introduction of new arrivals, andalso featuring interested topics.

We started a series of short video clips
where an IPMU scientist explained technicalscientific terms to general public in just one
minute on the website.

■ Figure 23: Susanne Reffert explains about thesuperstring theory in one minute video clip.

Outreach and Public Communications

Outreach and Public Communications

IPMU NEWS■ Figure 24: The website team lead by Midori Ozawa
won the 2008 President’s Award for operational
improvement.

75

We have been making special effort
to construct a website(http://www.ipmu.
jp/) that provides detailed and practicalinformation for the employees and visitors.
Particular emphasis has been placed to help
foreign employees to understand Japaneseprocedures on hiring contract such as salaryand tax and benefits, the work-related
information such as research grants andtravel expenses, as well as living informationsuch as schools and hospitals.

IPMU ANNUAL REPORT 2008

IPMU ANNUAL REPORT 200874

WebsiteInstitute for the Physics and Mathematics of the Universe (IPMU)
The University of Tokyo
5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8568, Japan
Tel: +81-4-7136-4940 Fax: +81-4-7136-4941
http://www.ipmu.jp/