ANNUALREPORT2018-2019

November 2018 - March 2020

Nambu Yoichiro Institute ofTheoretical and Experimental
Physics (NITEP),
Osaka City University

6 January 2021
Copyright © 2021 NITEP, Osaka City University.
All rights reserved.
Editors: Hiroshi Itoyama, Nobuyuki Kanda, and Takeshi Oota

PREFACE
Two years have passed since Nambu Yoichiro Institute of Theoretical and Experimental Physics(NITEP) was founded and we present our annual report, summarizing scientific accomplishments
made during the period of November 2018 through March 2020, namely 2018 and 2019 academic
years since the foundation. The number of our research members is 35 and currently many of us areco-members from our physics department. During this period, we produced 134 research papers and2 books. We organized and conducted 10 conferences/workshops among which 2 were unfortunately
cancelled by COVID-19. Several lecture series were given at Umeda satellite of OCU where graduate
as well as undergraduate students and young researchers from and outside our university attended.
Two public symposia were delivered, ending with a lot of interesting questions from audience who
include high-school students and retired citizens. A wide variety of research seminars and series ofjoint meetings from 14 research groups were actively given. We do hope that these activities havedemonstrated the notion of “Be Borderless” in all fields in theoretical and experimental physics asmuch as we could at this moment in order to follow the spirit of Professor Nambu closely.
Our main scientific theme since the foundation is “Quest of Universality and Emergence in Physics
led by Broken Symmetry” which lays down particle physics, nuclear physics, cosmology and condensed
matter physics both in theory and experiment. The research carried out during this period certainly
develops this notion vigorously. We are, however, in no sense satisfied with the accomplishments
achieved so far. We will carry out several frontier research program more vigorously by the affiliation
with international and domestic institutions from now on. We will continue to host international
conferences and symposia which are vital to be held in Far East Asia and to organize interesting
workshops and public lectures of our own. We will make every effort to inspire and promote young
scientists who are needed for future breakthrough. We are determined to dedicate ourselves to theadvances of NITEP toward a full-fledged research institute.
Hiroshi Itoyama, the directoriii

Contents
PREFACEiii

1 ABOUT NITEP

1

2 NEWS

1

3 AWARDS

1

4 INTERNATIONAL COLLABORATION

2

5 RESEARCH HIGHLIGHTS
5.1 Unitary matrix model, supersymmetric gauge theory, and Painlevé system . . . . . . .
5.2 A journey to search for the origin of ultra-high-energy cosmic rays at the OCU . . . .
5.3 Ultracold Fermi atomic gases are shining in NITEP . . . . . . . . . . . . . . . . . . . .
5.4 Exotic Spontaneous Symmetry breaking in nematic-spin superfluids . . . . . . . . . .

3
3
5
8
9

6 CONFERENCES & WORKSHOPS
6.1 Conferences/Symposia/Workshops organized by NITEP . . . . . . . . . . . . . . . . .
6.2 Conferences/Symposia/Workshops supported by NITEP . . . . . . . . . . . . . . . . .

11
11
11

7 MEETINGS & SEMINARS
7.1 Lectures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2 Seminars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.3 Joint Monthly Meetings of Nuclear Theory Lab. and Ultracold Quantum Gas Lab. . .
7.4 NITEP Joint Seminar of Mathematical Physics and Particle Physics . . . . . . . . . .
7.5 NITEP Colloquium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.6 Public Symposium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12
12
12
12
13
13
14

8 PUBLICATIONS
8.1 Books . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2 Research Papers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

15
15
15

9 MEMBERS

26

iv

1

ABOUT NITEP

Nambu Yoichiro Institute of Theoretical and Experimental Physics (NITEP), Osaka City University was founded on Novermber 1, 2018.
Osaka City University (OCU) is known to be the only university in Japan where Yoichiro Nambu
taught as professor before he left for the United States. Since then, our physics department has beenrecognized as a first-rate research institute in physics till today, emphasizing free spirit and imagination
fostered by the group led by Professor Nambu in early fifties. In 2013, OCU awarded Professor Nambu
a Special Emeritus Professor for his Novel prize in Physics in 2008. In 2018, the President Tetsuo
Arakawa decided to open a new research institute in physics on our campus crowned under Nambu to
promote our activities and foster human resources further, aiming at the formation of an international
center where scientists both from abroad and inside Japan gather regularly. International presence of
our university has thus been strengthened.

2

NEWS
1. Nambu Yoichiro Institute of Theoretical and Experimental Physics (NITEP) was founded. (1November 2018)
2. NITEP has become one of the supporting institutions of the journal, Progress of Theoreticaland Experimental Physics (PTEP). (20 January 2020)
3. KAGRA, a gravitational wave observation project with the participation of Nobuyuki Kanda(Deputy Director of NITEP) and Yousuke Itoh, has started its observations. (25 February 2020)

3

AWARDS
1. Makoto Tsubota was selected as a winner of the 2019 Fluid Science Research Award on
2 August 2019.
2. Hiromitsu Takeuchi and Koichi Sato have been selected as recipients of the 2019 Yoichiro
Nambu Memorial Encouragement Award for Young Scientists on 24 October 2019.
3. Masako Iwasaki was chosen as a winner of the 2019 Osaka City University Special Award
for Female Researchers [Okamura Prize] on 25 December 2019.

1

4

INTERNATIONAL COLLABORATIONNITEP has been putting forward international collaborations in several directions strongly since its
foundation.
In high energy experiments, Y. Seiya and K. Yamamaoto have been working at the long baseline neutrino oscillation experiment T2K, concluding that the angle δCP may be around the −π/2.
They are also working at the DeeMe experiment in preparation to search for the charged lepton flavor
violating process, µ-e conversion. M. Iwasaki and E. Nakano have been working on the international
B factory experiments of Belle and Belle II. M. Iwasaki has also been working for the future ILC
experiment on the SiD R&D and physics feasibility studies.
In high energy theory, N. Maru has been working with N. Okada and S. Okada on the collider
physics and the dark matter physics related to the Higgs sector in the standard model. M. Yamanaka
has collaborated with people at Laboratoire Univers et Particules de Montpellier (LUPM) on muonelectron conversion in nuclei. In quantum field theory and string theory, H. Itoyama has continued tocollaborate with A. Mironov and A. Morozov, the two renowned Russian scientists at ITEP, Moscow
and produced three papers on tensor models and their algebraic properties. S. Moriyama collaborates
intermittently with Heng-Yu Chen at National Taiwan University on various aspects of conformal field
theories.
In gravitational wave observations, N. Kanda, Y. Itoh, and T. Sawada are the members of the
KAGRA collaboration, which consists of more than 400 researchers from more than 110 institutionsin 15 countries and regions around the world (as of August 2020). Kanda serves as an executive officemember of the KAGRA collaboration, Itoh is a liaison member of several LIGO-Virgo-KAGRA jointcommittees from the KAGRA collaboration, and Sawada is a coordinator of the LIGO-Virgo-KAGRA
observing runs. In cosmic ray observations, S. Ogio and Y. Tsunesada are principal researchers of theTelescope Array experiment, the largest cosmic ray observatory in the northern hemisphere. Ogio is
the spokesperson, and Tsunesada serves as the analysis coordinator leading the science team of thisJapan-US-Korea-Russian collaboration
In theory of gravitation and astrophysics, K. Nakao has been in contact with P. S. Joshi Charotar
University of Science and Technology (CHARUSAT) on strong gravity.
In strongly correlated electron systems, A. Oguri and Y. Nishikawa have collaborated with peopleat (i) CNRS, Univ. Paris-Sud, Universite Paris Saclay, France, and (ii) Imperial College London. The
collaborations involve not only theorists but also experimentalists. In low temperature physics, inparticular, turbulence at Bose gases and liquid helium, M. Tsubota conducted the joint research of
low temperature physics with the scientists of Yale University, Florida State University, USA, University of Cambridge, UK, National Taiwan Normal University, Taiwan, and University of Konstanz,
Germany, publishing five papers. H. Takeuchi collaborated with people at Seoul National University,
Antwerp University, National Changhua University of Education, Newcastle University, and Universityof Otago, publishing four papers.

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5

RESEARCH HIGHLIGHTS

5.1

Unitary matrix model, supersymmetric gauge theory, and Painlevé system
Takeshi Oota

In the papers [1,2], three of us, H. Itoyama, T. Oota and K. Yano, have argued that certain unitary
one matrix model is closely related to the N = 2 supersymmetric SU (2) gauge theory with two matter
hypermultiplets. This is an example of the gauge theory/matrix model correspondence.
The partition function of the unitary matrix model takes the formZ
Z = [dU ] exp (Tr W (U )) ,where U is an N × N unitary matrix, [dU ] denotes the integration measure for the unitary group
U (N ), and W (U ) is the potential given by
W (z) = −1(z + z −1 ) + M log z.
2g

Here g and M are coupling constants of the matrix model. The M = 0 case is the famous unitary
theory, called the Gross-Witten-Wadia model which exhibits the third-order phase transition in thelarge N limit.
The spectral curve of this matrix model is isomorphic to the Seiberg-Witten curve of the corresponding gauge theory. Furthermore, the partition function Z can be identified with a finite analog
of the Fourier transformation of the instanton partition function of the gauge theory.
In addition to the gauge theory/matrix model correspondence, this system is related to the Painlevé
equation. The Painlevé equations are certain non-linear second-order ordinary differential equations(ODEs). The partition function Z of the matrix model is the tau function of the underlying Painlevé
equation, the Painlevé III0 . The Painlevé equations are the Hamiltonian systems. For PIII0 ,
dq
∂H
=
,
dt
∂p

dp
∂H
=−
,
dt
∂q

where the Hamiltonian is given by


1 2 2
1
2
H=
q p − (q + v2 q − t)p + (v1 + v2 )q .
t2Here v1 and v2 are parameters related to those of the matrix model by v1 = M + N , v2 = −M + N .
The time variable t is identified with 1/(4g 2 ). The tau function τ of PIII0 is defined byH=dlog τ.
dt

The relation between the tau function of PIII0 and the partition function of the matrix model is givenbyτ = t(1/2)M N Z.
We remark that the Bäcklund transformations of the PIII0 generate the discrete Painlevé equation,
and are isomorphic to the Weyl group of the (2A1 )(1) root system. The discrete Painlevé equation is(1)(1)
also closely related to a rational surface of type D6 , hence it is denoted by d-P((2A1 )(1) /D6 ).
We can consider the double scaling limit to the critical point of the unitary matrix model. This
limit corresponds to the limit to the infrared superconformal fixed point of the gauge theory, called3the Argyres-Douglas point. Also, the discrete Painlevé equation d-P((2A1 )(1) /D6 ) turns into the(continuous) Painlevé II equation in this limit.
The Argyres-Douglas theory (AD theory) is the superconformal low energy effective theory of theN = 2 supersymmetric gauge theory on the Coulomb branch. The AD theory does not have theLagrangian description because of the existence of mutually non-local massless states. The double
scaling limit of the unitary matrix model captures the critical behavior of the 4D N = 2 supersymmetric SU (2) gauge theory with Nf = 2 around its Argyres-Douglas superconformal point of type
H1 = (A1 , A3 ).
In [3], we have generalized the above gauge theory/matrix model correspondence to more generalcase. It is the correspondence between certain unitary matrix model and the 4D N = 2 gauge theory
called the Â2k,2k theory. The Â2k,2k theory is the SU (2) gauge theory coupled to two AD theories oftype D2k .
We have shown that this unitary matrix model at the k-th multicritical point corresponds to the(A1 , A4k−1 ) AD point of the Â2k,2k theory. We also derived a system of two ODEs for the scaling
functions to the free energy by taking the double scaling limit in the k = 2 case.
(1)[1] H. Itoyama, T. Oota and K. Yano, “Discrete Painlevé system and the double scaling limit of thematrix model for irregular conformal block and gauge theory,” Phys. Lett. B 789, 605-609 (2019)[arXiv:1805.05057 [hep-th]].
[2] H. Itoyama, T. Oota and K. Yano, “Discrete Painlevé system for the partition function of Nf = 2
SU (2) supersymmetric gauge theory and its double scaling limit,” J. Phys. A 52, no.41, 415401 (2019)[arXiv:1812.00811 [hep-th]] (NITEP preprint #1).
[3] H. Itoyama, T. Oota and K. Yano, “Multicritical points of unitary matrix model with logarithmic
potential identified with Argyres-Douglas points,” Int. J. Mod. Phys. A35, 2050146 [12 pages] (2020)[arXiv:1909.10770 [hep-th]] (NITEP preprint #33).
[4] T. Oota, “Matrix model, CFT and SUSY gauge theory,” The 3rd Intensive Lecture for KEK Theory
Center Project “From Strings to Higgs/Flavors”, High Energy Accelerator Research Organization(KEK) , Ibaraki, 19-21 November 2018.
[5] T. Oota, “Matrix model, supersymmetric gauge theory, and discrete Painleve equation,” International Symposium in Honor of Professor Nambu for the 10th Anniversary of his Nobel Prize in Physics,
Osaka City University, Osaka, Japan, 13 December 2018.
[6] T. Oota, “Matrix model, supersymmetric gauge theory and Painleve equation,” The 1st NITEP
Lecture Series, Osaka City University (Umeda Satellite), Osaka, 17 and 19 January 2019.
[7] T. Oota, “Matrix models, supersymmetric gauge theories and Painleve equations,” The 2nd Workshop on “Mathematics and Physics in General Relativity”, Setsunan University, Osaka, 23 March
2019.
[8] T. Oota, “Unitary matrix model, supersymmetric gauge theory, and Painleve system,” International Workshop “New Trends in Integrable Systems 2019”, Osaka City University, Osaka, Japan, 12
September 2019.

4

5.2

A journey to search for the origin of ultra-high-energy cosmic rays at the OCU
Jihyun Kim

From October 1, 2018, to August 31, 2020, I have been working on the search for the natureand origin of ultra-high-energy cosmic rays (UHECRs) as a postdoctoral researcher of the cosmic ray
physics laboratory at the Osaka City University, which is one of the most active research groups forcosmic rays in Japan.
The UHECRs are extremely energetic particles that originated from outer space that impingeon Earth’s atmosphere, such as protons or nuclei, which have energies greater than 1018 eV. These
particles are very rare so that a gigantic observatory is necessary for capturing these rare events
effectively. To this end, the Telescope Array (TA) project, an international consortium of US, Japanese,
Korean, Russian and European scientists, has deployed sophisticated detectors over thousands ofsquare kilometers of desert in the USA to determine the energy, composition and source directionof UHECRs. Our cosmic ray physics laboratory has played a leading role in the TA project. My
contributions to the collaboration have focused on studying the arrival direction of UHECRs to search
for the origin of UHECRs by using simulations and statistical test methods.
In 2014, the TA experiment identified an intermediate scale of anisotropy in the arrival directionsof UHECRs Those clustered UHECR events, so-called the hotspot, are expected to give us a clue totheir origin. However, it remains unanswered because there is no prominent source candidate behindthe hotspot. To understand the sky distribution of TA events, we investigated the structures ofgalaxies around the hotspot region in the local universe. We found that there are filaments of galaxies,
connected to the Virgo cluster, and a correlation of statistical significance between the galaxy filaments
and TA events. With 5-year TA data, we found 19 out of 72 events were correlated with filaments
at 3.4◦ , while 4.2 events were expected from the isotropy simulation. By Monte-Carlo simulation,
the probability that such correlated events observed by chance is estimated to be around 5.1σ level.
Based on this finding, we suggested a model for the origin of TA hotspot events. We assume thatUHECRs are produced at a source or sources inside the Virgo cluster. They roam around for a while inthe cluster, confined by the magnetic fields. Then, some of them escape through connected filaments
and are scattered at turbulent magnetic fields in filaments, shown in Fig. 1. This model constrains
magnetic fields’ strength in filament to be & 20nG, which needs to be confirmed in future observations.
This work was presented at the International Conference on UHECRs, Paris, France, in 2018. Also,it was published in Science Advances and covered by Newsweek on January 2, 2019 [1, 2].
To examine our model’s feasibility for the origin of the hotspot, we generated the model universes
through numerical simulations for the large scale structure formation. A cosmological hydrodynamics
code, assuming a Λ CDM cosmological model, were used. We injected a hundred thousand of protons
with 6 × 1019 eV at random positions within the cluster core region toward random directions. Then,
we traced their propagation trajectories with the relativistic equation of motions. The fraction of
the UHE protons confined within clusters during the GZK time and the fraction which escapes fromclusters to filaments were studied. The preliminary results of this work show that the ratio of particles
that directly escape from the cluster to voids to particles that escape to the filaments a bit different
but almost similar, 50 to 50. The results confirm that it is possible for a UHE proton produced froma source in a galaxy cluster to escape through connected filaments, which supports the model wesuggested for the origin of TA hotspot. However, it is shown that the details are very sensitive to theconfiguration and strength of magnetic fields. For the more realistic simulation to reproduce the TA
hotspot events with the Virgo cluster and its filaments, we need to know the exact configuration of themagnetic field in those regions. As of now, however, the magnetic fields in the cosmic web are not wellknown. Therefore, to do that, it needs future projects for the exploration of intergalactic magnetic
fields. This work was presented at the spring meeting of the Korean Physical Society, Daejeon, Korea,
and the International Cosmic Ray Conference, Madison, USA, in 2019 [3].
5Also, we reported the updated analysis result of the correlation between TA UHECRs and thefilaments of galaxies connected to the Virgo cluster at the 75th annual meeting of the Physical Societyof Japan. In the published paper, we used TA 5-year data, which was an identical dataset used forthe hotspot identification, but more data is now available owing to the TA collaboration’s continued
efforts. Using 11-year data recorded by the TA experiment, we confirmed that there is still a significant
correlation between UHECRs and the filaments of galaxies. The probability that such correlation
observed by chance is estimated to be around 4.4σ level.
My research activities have been engaged not only in work related to the conference or publication
but also in observations and maintenance, which are essential to collect data. In two years while I
was in OCU, I went to Utah twice, around two months in total, as a leader of observation shift to run
our facilities at nighttime and to train students who first participate in observation. Also, when TA
collaboration tested the remote observation in Japan, OCU managed two-month observations, and I
took a shift and trained our students. Most of our students had no experience with the observation;
therefore, I tried to teach them carefully and encourage them to become independent.
My area of expertise was slightly different from that of our laboratory in some senses; however, myadvisor, Ogio-san, has given me lots of freedom to explore my research independently. In addition, he
and Tsunesada-san have provided new perspectives in researches, and we were able to have productive
discussions, which were very helpful for me to extend the research ability and to develop me to work as
an independent researcher. Also, I have had a goal that I would do my best to communicate with ourstudents to help them to study basic concepts from the beginning based on my background. Though
we had some language barriers, it didn’t matter, and it was a great time for me to interact with ourstudents. The research experience at OCU was an excellent opportunity for me to exchange valuableideas and have constructive discussions. After leaving OCU, I believe we can continue discussions
wherever I am. Thank you, and good luck to you!

6

Figure 1: Schematic drawing of a model for the origin of TA hotspot events. The model assumes
UHECRs are produced at a source or sources inside the Virgo Cluster, which are represented in thegray sphere at the center of the box. They roam around for a while confined by cluster magnetic
fields, then some of them escape to the filaments of galaxies, which are shown with bullets of color,
connected to the cluster. The solid lines with color show galaxies’ string-like filamentary structure.
By the turbulent magnetic fields in the filaments of galaxies, some of UHECRs would be scattered out
to the void region and may come to our Galaxy. If this real, the arrival direction of UHECRs would
show a correlation with the distribution of filaments of galaxies in the sky; that is, more data would
be detected towards the filaments, which can give us a clue to the origin of TA hotspot. Adopted from[1].

[1] J. Kim, D. Ryu, H. Kang, S. Kim, and S. Rey, “Filaments of Galaxies as a Clue to the Origin of
Ultra-High-Energy Cosmic Rays,” Science Advances 5, eaau8227, Jan., 2019[2] https://www.newsweek.com/ultra-high-energy-cosmic-rays-galaxy-filament-virgo-cluster-space-universe1277159[3] J. Kim, D. Ryu, S. Roh, J. Ha, and H. Kang, “Propagation of Ultra-High-Energy Cosmic Rays in
the Magnetized Cosmic Web,” PoS(ICRC2019)315 (The 36th International Cosmic Ray Conferencein Madison, U.S.A)
7

5.3

Ultracold Fermi atomic gases are shining in NITEP
Munekazu Horikoshi

An experimental apparatus for ultracold Fermi gases using 6 Li atoms has been developed in NITEP.
We have achieved magneto-optical trapping (MOT) of 6 Li atoms as shown in the picture. The gas in
the MOT is already so cold in the order of mK. After further cooling of the gas below µ K in a processof evaporative cooling, we can explore quantum worlds where the de Broglie wavelength exceeds themean interparticle distance. Since ultracold 6 Li atoms possess a great feature of “tunable attractive
interactions between fermions” through the Feshbach resonances, the atomic system can work as great
quantum simulator for interacting fermions. Actually, our previous work showed the equation of state(EOS) of dilute neutron matter in neutron stars by cold atom experiment [1,2].

In NITEP, we have progressed projects about the universal viscosity coefficients in the unitary
regime, novel three-body force in a Feshbach molecular gas, quantum simulator for negative sign
problems in Fermi systems, optical control of Feshbach resonances, programable superfluid circuit,precision spectroscopy of molecules, and coherent control of polyatomic molecules, and so on. Especially, the spectroscopic study of Feschbach molecules has made great progress last year. This
result is a big step towards quantitative measurement of Feshbach molecular gases, coherent control
of Feschbach molecules or Efimov trimers, and application to quantum chemistry.

[1] Munekazu Horikoshi, Masato Koashi, Hiroyuki Tajima, Yoji Ohashi, and Makoto Kuwata-Gonokami,“Ground-state thermodynamic quantities of homogeneous spin-1/2 fermions from the BCS region to
the unitarity limit”, Phys. Rev. X 7, 041004 (2017).
[2] Munekazu Horikoshi and Makoto Kuwata-Gonokami, “Cold atom quantum simulator for dilute
neutron matter”, International Journal of Modern Physics E Vol. 28, No. 1, 1930001 (2019).
8

5.4

Exotic Spontaneous Symmetry breaking in nematic-spin superfluids
Hiromitsu Takeuchi

Spontaneous symmetry breaking is a universal concept applied to different physical systems, highenergy physics, nuclear physics, cosmology, and condensed matter physics. In this article, I would liketo introduce an exotic example of spontaneous symmetry breaking in quantum fluids from condensed
matter physics.
Prof. Nambu came up with the idea of spontaneous symmetry breaking that leads to the Nobel
prize while working in superconductivity, superfluidity of electron flow. Superconductivity and superfluidity are fundamental to understand the macroscopic behavior of quantum fluids at very low
temperatures. In these systems, Fermi-Dirac and Bose-Einstein statistics of quantum statistical mechanics govern the many-body behaviors of Bose and Fermi particles. In bosonic quantum fluids,
Bose-Einstein statistics causes Bose-Einstein condensation, in which a large fraction of bosons occupy
the lowest quantum state described by a macroscopic wave function ψ. In fermionic systems, pairsof two fermions, called the Cooper pairs, behaves like bosons and form Bose-Einstein condensates(BECs). Since the wave function is originated by quantum mechanics, such quantum fluids exhibit
quantum mechanical behaviors macroscopically, called the macroscopic quantum effect, such as superfluidity and superconductivity, ”frictionless” and ”resistantless” flows of neutral and charged particles.
The appearance of a macroscopic wave function implies that the phases of wave functions of macroscopic number of particles takes a certain value although the phase of wave function of each particle
can be arbitrary without taking account of correlation between particles. This is just a manifestationof spontaneous symmetry breaking associated with the phase φ = arg ψ, the orientation in the complex
plane (Reψ, Imψ).
When the spin degrees of freedom of condensed particles become important, a variety of macroscopic quantum effects occur due to the spontaneous symmetry breaking associated with the orientation of macroscopic spin s in addition to that of φ of the macroscopic wave function. Such quantum
fluids called spinful superfluids and have been studied extensively after realizations of spin-triplet pwave superfluid 3 He and spinor BECs of 87 Rb and 23 Na atoms. Spinful superfluids are classified into
two types according to the magnetic properties, ferromagnetic and anti-ferromagnetic superfluids. The
symmetry breaking in the former superfluids is described by the orientation of the vector field s whilethat in the latter by a different vector field d, which characterizes the anti-ferromagnetic properties.
Anti-ferromagnetic superfluids may be called as spin-nematic or nematic-spin superfluids because of
their behavior like the uniaxial nematic liquid crystal, in which the orientation of the rod-shaped
molecules is parallel to a vector field ñ called the director. The liquid crystal is familiar to us by being
applied to liquid-crystal displays. In the liquid crystal, a state of ñ is macroscopically identical tothat of −ñ. This property can be mimicked by combing the degrees of freedom of d with that of themacroscopic phase φ.
Recently, the manifestation of the nematic-spin property has been directly detected for the firsttime by observing an exotic topological defect, called the wall-vortex composite defect (see Fig. 1)[1]. Quantum vortex is known as a fundamental topological defect, whose circulation is quantizedhby κ = Mwith the Planck constant h and the mass M of the carrier particles. The quantizationof the circulation comes from the physical requirement that the macroscopic wave function must bea single-valued function; the phase φ changes by 2πn with integer n around a vortex. However, theobserved wall-vortex defect is composed by a half quantum vortex, whose circulation is a half of κ.
The whole wave function is single-valued when the phase rotates by π and the pseudo-director d turns
to the opposite direction as shown in Fig. 1. This sort of exotic topological objects have been also
discussed in superfluid 3 He related to a cosmological scenario in which similar objects are nucleated
via spontaneous symmetry breaking phase transition in the early universe [2], but little is known about
them. Further experimental and theoretical investigations of the composite topological defects will
9

Figure 1: (Left) The wall-vortex composite defect observed in a atomic cloud of spin-1 Bose-Einsteincondensates. The dark area shows a region with higher density in a spin component (ψ0 ). A linear
object corresponds to a domain wall. The wall terminate on a half quantum vortex (HQV). (Right)
The schematic of the core structure of a half quantum vortex (HQV) terminated by a domain wall.
The macroscopic wave function ψ0 has a phase different π across the domain wall. The direction andcolor of the arrows show the direction of the pseudo-director field and the phase of the macroscopic
wave function. The left panel is extracted from Fig. 2 in Ref. [1].
shed light on unexplored new phenomena of spontaneous symmetry breaking.

[1] Seji Kang, Sang Won Seo, Hiromitsu Takeuchi, and Y. Shin, Phys. Rev. Lett. 122, 095301 (2019).
[2] J. T. Mäkinen, V. V. Dmitriev, J. Nissinen, J. Rysti, G. E. Volovik, A. N. Yudin, K. Zhang, andV. B. Eltsov, Nat. Commun. 10, 237 (2019).
10

6

CONFERENCES & WORKSHOPS

6.1

Conferences/Symposia/Workshops organized by NITEP

1. International Symposium in Honor of Professor Nambu for the 10th Anniversary of his Nobel
Prize in Physics, 12-13 December 2018, Media Center, Osaka City University.
2. Shanghai University (SHU)-Osaka City University (OCU) Symposium on Physics, 27 December
2018, Osaka City University.
3. NITEP One-day Workshop “Recent advances in nuclear cluster physics”, 5 March 2019, 5th
Lecture Room (F212) of Science Faculties General Experiment, Osaka City University.
4. NITEP workshop “Scattering Observables and Nuclear Structure Connected by Microscopic
Theory”, 28 March 2019, 3rd Lecture Room (104) of Umeda Satellite, Osaka City University.
5. Workshop “Turbulence of all kinds”, 25-26 April 2019, Umeda Satellite, Osaka City University.
6. Flavor Physics Workshop 2019, 19-22 November 2019, Kanpo no Yado Tondabayashi (Tondabayashi, Osaka). (Co-organized by RCNP (Osaka University) and NITEP).
7. “Elementary Particle Phenomenology Workshop 2019”, 23-25 November 2019, Media Center,
Osaka City University.
8. NITEP one year anniversary conference/workshop series: “Turbulence of all kinds”, 7-9 January
2020, Media Center, Osaka City University.
9. The workshop “Black Hole Magnetosphere 2020”, 3-5 March 2020, 8th Lecture Room (F216) of
Science Faculties General Experiment Building, Osaka City University. (Cancelled due to theCoronavirus (COVID-19)).
10. NITEP one year anniversary conference/workshop series: Randomness, Integrability and Representation Theory in Quantum Field Theory, 26-28 March 2020, Media Center, Osaka City
University. (Support: Osaka City University Advanced Mathematical Institute: MEXT Joint
Usage/Research Center on Mathematics and Theoretical Physics). (Cancelled due to the Coronavirus (COVID-19)).

6.2

Conferences/Symposia/Workshops supported by NITEP

1. The international workshop “TAUP 2019 in Toyama,” 9-13 September, 2019, Toyama.
2. The international workshop “New Trends in Integrable Systems 2019,” 9-20 September 2019,
Media Center, Osaka City University.
3. One day workshop “GR in AdS,” 16 January 2020, Rikkyo University.

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7

MEETINGS & SEMINARS

7.1

Lectures

1. 1st NITEP Lecture Series: Takeshi Oota (NITEP), Matrix model, supersymmetric gauge theory
and Painlevé equation. 17 January 2019, 16:30-; 19 January 2019, 10:00-12:00, Large Seminar
Room of Umeda Satellite, Osaka City University.
2. 2nd NITEP Lecture Series: Yuki Yokokura (RIKEN), A Self-consistent Model of Evaporating
Black Holes. 29 March 2019, 16:00-, Large Seminar Room of Umeda Satellite, Osaka City
University.
3. 3rd NITEP Lecture Series: Nobuyoshi Ohta (Kindai University), Introduction to asymptotic
safety. 16-17 April 2019, 16:00-, Large Seminar Room of Umeda Satellite, Osaka City University.
4. 4th NITEP Lecture Series: Kazuyuki Ogata (RCNP, Osaka U.), Introduction to Nuclear Reaction Theory. 6 and 12 June 2019, 16:00-19:50, Large Seminar Room of Umeda Satellite, Osaka
City University.
5. The 19th Chushiro Hayashi Memorial Lecture (supported by NITEP): Takahiro Tanaka (Kyoto
University), Cosmic Image Revealed by Gravitational Waves; Fumitaka Sato (Professor Emeritus, Kyoto University), Dr. Hayashi’s Youth: Yoichiro Nambu and Chushiro Hayashi. 29
October 2019, 15:15-, the auditorium on the 10th floor of Media Center, Osaka City University.
6. V. P. Nair (The City College of New York), Lectures on the Frontiers of Quantum Field Theory,24-25 March 2020, Large Seminar Room of Umeda Satellite, Osaka City University. (Support:
Osaka City University Advanced Mathematical Institute: MEXT Joint Usage/Research Center
on Mathematics and Theoretical Physics). (Cancelled due to the Coronavirus (COVID-19)).

7.2

Seminars

1. NITEP Astrophysics Seminar: Peter Tinyakov (Universite Libre de Bruxelles, Belgium), Solar
mass black holes and dark matter; Igor Tkachev (Russian Academy of Sciences), Axion stars:
from birth to death. 22 May 2019, 13:30-15:45, Meeting Room of the Faculty of Science.
2. NITEP Seminar: Nguyen Tri Toan Phuc (VNUHCM-University of Science, Ho Chi Minh City,
Vietnam Institute for Nuclear Science and Technology, VINATOM, Vietnam), Multistep alphatransfer in elastic 16 O+12 C scattering. 19 June 2019, 15:15-, B105 room on the ground floor on
the Building No. 12 (Faculty of Science) at Sugimoto campus of Osaka City University.

7.3

Joint Monthly Meetings of Nuclear Theory Lab. and Ultracold Quantum Gas
Lab.

1. 1st Meeting: Yohei Chiba gave a basic explanation on the importance of clusters in nuclei. (26June 2019, 14:30-16:30, Room B105).
2. 2nd Meeting: Munekazu Horikoshi discussed the Feschbach resonances and Efimov states incooled atoms, comparing phase transition phenomena in cooled atoms and nuclei. (17 July
2019, 10:00-12:30, Room B105).
3. 3rd Meeting: Kazuyuki Ogata, The Feschbach resonance of 11 Li (and the Fano resonance of22 C). (23 August 2019, 13:00-15:00, Room B105).

12

4. 4th Meeting: Munekazu Horikoshi, Photoexcitation of Feschbach molecules. (6 November 2019,13:00-15:00, Room B105).
5. 5th Meeting: Koichi Sato, Spontaneous Symmetry Breaking in Nuclei -Superfluidity and Deformation. (11 December 2019, 13:00-15:00, Room B105).
6. 6th Meeting: Shin Inouye, Scattering of cooled atoms. (29 January 2020, 13:00-15:00, RoomF202).

7.4

NITEP Joint Seminar of Mathematical Physics and Particle Physics

1. Masato Yamanaka (NITEP), Search for charged lepton flavor violation using nucleus, 14 May
2019, 16:30-, 2nd Lecture Room (F203).
2. Naoki Sakakura (YITP, Kyoto U.), Space-time concept of the canonical tensor model depictedby mathematical methods of data analysis, 21 May 2019, 16:30-, 2nd Lecture Room (F203).
3. Katsuya Hashino (Osaka University), Verification of the extended Higgs model by gravitational
wave observation and accelerator experiments, 4 June 2019, 16:30-, 4th Lecture Room (F205).
4. Yuki Sato (Nagoya University), How to ”cool down” Ising model on 2d dynamical triangulations,18 June 2019, 16:30-, 4th Lecture Room (F205).
5. Ryo Nagai (University of Tokyo), (Extended) Higgs Field Effective Theory and its Applications,25 June 2019, 16:30-, 4th Lecture Room (F205).
6. Gi-Chol Cho (Ochanomizu University), Lepton-flavor violation via four-Fermi contact interactions at e+ e− linear collider, 16 July 2019, 16:30-, 4th Lecture Room (F205).
7. Satoshi Tsuchida (Osaka City University), Dark Matter Signals on a Laser Interferometer, 1
October 2019, 16:30-, 4th Lecture Room (F205).
8. Reona Arai (Tokyo Institute of Technology), Finite N corrections to the superconformal index
from D3-brane analysis in AdS5 /CFT4 , 15 October 2019, 16:30-, 4th Lecture Room (F205).
9. Yutaka Ookochi (Kyushu University), Catalytic Creation of Baby Bubble Universe with Small
Positive Cosmological Constant, 12 November 2019, 16:30-, 4th Lecture Room (F205).
10. Yasuyuki Hikida (YITP, Kyoto U.), Matrix-valued higher spin holography, 26 November 2019,16:30-, 4th Lecture Room (F205).

7.5

NITEP Colloquium

1. 1st NITEP Colloquium: Daisuke Yonetoku (Kanazawa University), Gamma-Ray Bursts andGravitational Wave Astronomy. 19 December 2018, 16:30-17:30, E108 Meeting Room of theFaculty of Science.
2. 2nd NITEP Colloquium: Masao Kuriki (Hiroshima University), Design Concept of the Linear
Collider Accelerator. 9 January 2019, 16:30-17:30, E108 Meeting Room of the Faculty of Science.
3. 3rd NITEP Colloquium: Three lectures were given by new faculty members. Koichi Sato,
Large-amplitude collective motion of atomic nuclei and its microscopic descrition; Kim Jihyun,
Ultra-high-energy cosmic rays and a clue to their origin; Munekazu Horikoshi, Ultracold atoms
and molecules converting into various quantum systems. 27 June 2019, 13:00-17:00, the Room
for Cultural Exchange of the Media Center.
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4. 4th NITEP Colloquium: Tomohiro Harada (Rikkyo University), Primordial black hole formationin the matter-dominated phase of the Universe: recent results. 2 September 2019, 15:30-, E108
Meeting Room of the Faculty of Science.
5. 5th NITEP Colloquium: Takuya Hirano (Gakushuin University), Dissipation-Assisted Coherent
Formation in a Spinor BEC; Kosuke Shibata (Gakushuin University), Development of a highsensitive BEC magnetometer. 7 October 2019, 15:30-17:00, 9th Lecture Room (E101).
6. 6th NITEP Colloquium: Yasuhiro Asano (Hokkaido University), Andreev bound states without
dispersion and odd-frequency Cooper pairs. 16 October 2019, 16:00-, E108 Meeting Room of
the Faculty of Science.
7. 7th NITEP Colloquium: Hidetoshi Kubo (Kyoto University), High-Energy Universe as Seen withGamma Rays. 19 December 2019, 15:15-16:55, E108 Meeting Room of the Faculty of Science.
8. 8th NITEP Colloquium: Akihiro Yoshimi (Okayama University), Study of very low energy
excitation levels in laser-excitable 229 Th nuclei and their applications. 15 January 2020, 15:3018:00, 4th Lecture Room (F205).

7.6

Public Symposium

1. Special Seminar for Citizens 2018 “The Key to Unlocking the Mysteries of the Universe: What
Prof. Nambu Found” was held on December 16, with three lectures by NITEP members Hiroshi
Itoyama, Yoshihiro Seiya, and Makoto Tsubota. 16 December 2018, 13:00-17:00, the large lecture
theater of Tanaka Memorial Hall, Osaka City University.
2. The public symposium “Photographed! Captured! The Black Hole” (co-organized by NITEP
and Osaka Branch of The Physical Society of Japan). 21 December 2019, 12:55-16:45, theauditorium on the 10th floor of Media Center, Osaka City University.

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8

PUBLICATIONS

8.1

Books

1. Yoshiki Tsunesada (Chap. 3), “Observations of the Universe III [2nd Edition] – High Energy
Astronomy,” (Series: Modern Astronomy, 17), Hajime Inoue et al. (eds.), Nippon Hyoron Sha
Co., Ltd (2019), ISBN 978-4-535-60767-5.
2. Nobuyuki Kanda (Sec. 5.5.3) and Shoichi Ogio (Sec. 4.8.6, Sec. 5.4.4 and Sec. 5.4.5), “Handbookof Astrophysics,” Fumio Takahara et al. (eds.), Asakura Publishing Co., Ltd (2020), ISBN9784-254-13127-7.

8.2

Research Papers

1. Hiroshi Itoyama, Takeshi Oota, Katsuya Yano, “Discrete Painleve system for the partition function of Nf = 2 SU (2) supersymmetric gauge theory and its double scaling limit,” J. Phys. A:
Math. Theor. 52, 415401 [49 pages] (2019), http://dx.doi.org/10.1088/1751-8121/ab3f4f.
2. Hideki Ishihara, Tatsuya Ogawa, “Perfect Charge Screening of Extended Sources in an AbelianHiggs Model,” arXiv:1811.10848 [hep-th].
3. Hideki Ishihara, Tatsuya Ogawa, “Charge-screened nontopological solitons in a spontaneously
broken U (1) gauge theory,” Prog. Theor. Exp. Phys. 2019, Issue 2, 021B01 [8 pages] (2019),
http://dx.doi.org/10.1093/ptep/ptz005.
4. Chul-Moon Yoo, Ken-ichi Nakao, “Constant-mean-curvature slicing of the Swiss-cheese universe,” Gen. Relativ. Gravit. 51, no.9, 114 [14 pages] (2019),
http://dx.doi.org/10.1007/s10714-019-2596-0.
5. Tomohiro Furukawa, Sanefumi Moriyama, “ABJM matrix model and 2D Toda lattice hierarchy,”
JHEP 1903, 197 [31 pages] (2019), http://dx.doi.org/10.1007/JHEP03(2019)197.
6. Junsik Han and Makoto Tsubota, “Phase separation of quantized vortices in two-component
miscible Bose-Einstein condensates in a two-dimensional box potential,” Phys. Rev. A 99, 033607[8 pages] (2019), http://dx.doi.org/10.1103/PhysRevA.99.033607.
7. Hideki Ishihara, Tatsuya Ogawa, “Homogeneous balls in a spontaneously broken U (1) gauge
theory,” Phys. Rev. D 99, 056019 [9 pages] (2019),
https://doi.org/10.1103/PhysRevD.99.056019.
8. Mengjiao Lyu, Kazuki Yoshida, Yoshiko Kanada-En’yo, Kazuyuki Ogata, “Direct probing of thecluster structure in 12Be via α-knockout reaction,” Phys. Rev. C 99, 064610 [9 pages] (2019),
http://dx.doi.org/10.1103/PhysRevC.99.064610.
9. Hiroshi Itoyama, Reiji Yoshioka, “Generalized cut operation associated with higher order variation in tensor models,” Nuclear Physics B 945, 114681 [13 pages] (2019),
http://dx.doi.org/10.1016/j.nuclphysb.2019.114681.
10. Nobuhito Maru, Yoshiki Yatagai, “Fermion mass hierarchy in grand gauge-Higgs unification,”
Prog. Theor. Exp. Phys. 2019, Issue 8, 083B03 [24 pages] (2019),
http://dx.doi.org/10.1093/ptep/ptz083.

1511. Yoshiko Kanada-En’yo, Kazuyuki Ogata, “α scattering cross sections on 12 C with a microscopic
coupled-channels calculation,” Phys. Rev. C 99, 064601 [13 pages] (2019),
http://dx.doi.org/10.1103/PhysRevC.99.064601.
12. Katsuichi Kanemoto, Shuto Hatanaka, Takayuki Suzuki, “Correlation between bias-dependent
ESR signals and magnetic field effects in organic light emitting diodes,” Journal of Applied
Physics, vol. 125, 125501 [7 pages] (2019), https://doi.org/10.1063/1.5084216.
13. Nir Navon, Christoph Eigen, Jinyi Zhang, Raphael Lopes, Alexander L. Gaunt, Kazuya Fujimoto, Makoto Tsubota, Robert P. Smith, Zoran Hadzibabic, “Synthetic dissipation and cascade
fluxes in a turbulent quantum gas,” Science 366, Issue 6463, 382-385 (2019),
http://dx.doi.org/10.1126/science.aau6103.
14. Sosuke Inui, Makoto Tsubota, Peter Moroshkin, Paul Leiderer, Kimitoshi Kono, “Dynamics ofFine Particles Due to Quantized Vortices on the Surface of Superfluid 4 He,” J. Low Temp. Phys.
196, Issue 1-2, 190-196 (2019), http://dx.doi.org/10.1007/s10909-018-02116-z.
15. P. Moroshkin, P. Leiderer, K. Kono, S. Inui, M. Tsubota, “Dynamics of the Vortex-Particle
Complexes Bound to the Free Surface of Superfluid Helium,” Phys. Rev. Lett. 122, 174502 [5pages] (2019), http://dx.doi.org/10.1103/PhysRevLett.122.174502.
16. Takahisa Igata, Hideki Ishihara, Yu Yasunishi, “Observability of spherical photon orbits in nearextremal Kerr black holes,” Phys. Rev. D 100, 044058 [6 pages] (2019),
http://dx.doi.org/10.1103/PhysRevD.100.044058.
17. Yoshiko Kanada-En’yo, Kazuyuki Ogata, “First microscopic coupled-channels calculation ofcross sections for inelastic α scattering off 16 O,” Phys. Rev. C 99, 064608 [10 pages] (2019),
http://dx.doi.org/10.1103/PhysRevC.99.064608.
18. Takuya Hirose, Nobuhito Maru, “Cancellation of one-loop corrections to scalar masses in YangMills theory with flux compactification,” JHEP 1908, 54 [19 pages] (2019),
http://dx.doi.org/10.1007/JHEP08(2019)054.
19. Koichi Sato, Takenori Furumoto, Yuma Kikuchi, Kazuyuki Ogata, Yukinori Sakuragi, “Largeamplitude quadrupole shape mixing probed by the (p, p0 ) reaction : A model analysis,” Prog.
Theor. Exp. Phys. 2019, 101D01 [10 pages] (2019), https://doi.org/10.1093/ptep/ptz095.
20. Yoshitaka Kuno, Joe Sato, Toru Sato, Yuichi Uesaka, Masato Yamanaka, “Momentum distribution of the electron pair from the charged lepton flavor violating process µ− e− → e− e− inmuonic atoms with a polarized muon,” Phys. Rev. D 100, 075012 [11 pages] (2019),
http://dx.doi.org/10.1103/PhysRevD.100.075012.
21. H. Itoyama, Sota Nakajima, “Exponentially suppressed cosmological constant with enhanced
gauge symmetry in heterotic interpolating models,” Prog. Theor. Exp. Phys. 2019, Issue 12,
123B01 [21 pages] (2019), http://dx.doi.org/10.1093/ptep/ptz123.
22. Kazuki Yoshida, Yohei Chiba, Masaaki Kimura, Yasutaka Taniguchi, Yoshiko Kanada-En’yo,
Kazuyuki Ogata, “Quantitative description of the 20 Ne(p, pα)16 O reaction as a means of probing
the surface α amplitude,” Phys. Rev. C 100, 044601 [6 pages] (2019),
http://dx.doi.org/10.1103/PhysRevC.100.044601.

16

23. Naotaka Kubo, Sanefumi Moriyama, “Hanany-Witten transition in quantum curves,” JHEP
1912, 101 [49 pages] (2019), http://dx.doi.org/10.1007/JHEP12(2019)101.
24. Nguyen Tri Toan Phuc, Kazuki Yoshida, Kazuyuki Ogata, “Toward a reliable description of(p, pN ) reactions in the distorted-wave impulse approximation,” Phys. Rev. C 100, 064604 [8pages] (2019), http://dx.doi.org/10.1103/PhysRevC.100.064604.
25. Yoshiko Kanada-En’yo, Kazuyuki Ogata, “Microscopic calculation of inelastic proton scattering
off 18 O, 10 Be, 12 Be, and 16 C to study neutron excitation in neutron-rich nuclei,” Phys. Rev. C
100, 064616 [13 pages] (2019), http://dx.doi.org/10.1103/PhysRevC.100.064616.
26. Tomohiro Furukawa, Sanefumi Moriyama, Yuji Sugimoto, “Quantum mirror map for del Pezzo
geometries,” J. Phys. A: Math. Theor. 53, 385401 (2020),
https://doi.org/10.1088/1751-8121/ab93fe.
27. Hirotaka Yoshino, Kazuma Takahashi, Ken-ichi Nakao, “How does a collapsing star look?,” Phys.
Rev. D 100, 084062 [27 pages] (2019), http://dx.doi.org/10.1103/PhysRevD.100.084062.
28. Satoshi Tsuchida, Nobuyuki Kanda, Yousuke Itoh, Masaki Mori, “Dark matter signals on a laserinterferometer,” Phys. Rev. D 101, 023005 [8 pages] (2020),
http://dx.doi.org/10.1103/PhysRevD.101.023005.
29. H. Itoyama, A. Mironov, A. Morozov, “Tensorial generalization of characters,” JHEP 2019, 127[33 pages] (2019), http://dx.doi.org/10.1007/JHEP12(2019)127.
30. Yuen Sim Neoh, Mengjiao Lyu, Yoshiki Chazono, Kazuyuki Ogata, “Effect of the repulsive corein the proton-neutron potential on deuteron elastic breakup cross sections,” Phys. Rev. C 101,
054606 [6 pages] (2020), https://doi.org/10.1103/PhysRevC.101.054606.
31. Toshiaki Kanai, Wei Guo, Makoto Tsubota, Dafei Jin, “Torque and Angular-Momentum Transfer
in Merging Rotating Bose-Einstein Condensates,” Phys. Rev. Lett. 124, 105302 [7 pages] (2020),
http://dx.doi.org/10.1103/PhysRevLett.124.105302.
32. Yoshiko Kanada-En’yo, Kazuyuki Ogata, “Cluster structures and monopole transitions of 14 C,”
Phys. Rev. C 101, 014317 [9 pages] (2020),
http://dx.doi.org/10.1103/PhysRevC.101.014317.
33. H. Itoyama, T. Oota, Katsuya Yano, “Multicritical points of unitary matrix model with logarithmic potential identified with Argyres-Douglas points,” Int. J. Mod. Phys. A 35, 2050146 [12pages] (2020), https://doi.org/10.1142/S0217751X20501468.
34. H. Itoyama, A. Mironov, A. Morozov, “Complete solution to Gaussian tensor model and its
integrable properties,” Phys. Lett. B 802, 135237 [8 pages] (2020),
http://dx.doi.org/10.1016/j.physletb.2020.135237.
35. Yohei Chiba, Yoshiko Kanada-En’yo, Yuki Shikata, “Cluster correlation and nuclear vorticity in
low-lying 1- states of 24 Mg,” arXiv:1911.08734 [nucl-th].
36. The T2K Collaboration (including Y. Seiya and K. Yamamoto), “Constraint on the matterantimatter symmetry-violating phase in neutrino oscillations,” Nature 580, 339–344 (2020),
https://doi.org/10.1038/s41586-020-2177-0.

17

37. N. Amburg, H. Itoyama, A. Mironov, A. Morozov, D. Vasiliev, R. Yoshioka, “Correspondence
between Feynman diagrams and operators in quantum field theory that emerges from tensor
model,” Eur. Phys. J. C 80, 471 [5 pages] (2020),
https://doi.org/10.1140/epjc/s10052-020-8013-8.
38. K. Abe et al. (T2K Collaboration), including Y. Seiya and K. Yamamoto, “Measurement of
neutrino and antineutrino neutral-current quasielasticlike interactions on oxygen by detecting
nuclear deexcitation γ rays,” Phys. Rev. D 100, 112009 [19 pages] (2019),
http://dx.doi.org/10.1103/PhysRevD.100.112009.
39. Nobuhito Maru, Yoshiki Yatagai, “Improving fermion mass hierarchy in grand gauge-Higgs
unification with localized gauge kinetic terms,” Eur. Phys. J. C 80, 933 [15 pages] (2020),
https://doi.org/10.1140/epjc/s10052-020-08485-8.
40. Yuki Adachi, Nobuhito Maru, “Strong first order electroweak phase transition in gauge-Higgs
unification at finite temperature,” Phys. Rev. D 101, 036013 [6 pages] (2020),
http://dx.doi.org/10.1103/PhysRevD.101.036013.
41. Satoshi Yui, Hiromichi Kobayashi, Makoto Tsubota, Wei Guo, “Fully Coupled Two-Fluid Dynamics in Superfluid 4 He: Anomalous Anisotropic Velocity Fluctuations in Counterflow,” Phys.
Rev. Lett. 124, 155301 [6 pages] (2020), https://doi.org/10.1103/PhysRevLett.124.155301.
42. Kousuke Iwamoto, Yuto Hayakawa, Shuto Hatanaka, Takayuki Suzuki, Katsuichi Kanemoto,“Electron–Hole Pairs Generated in the Crystalline Phase of Polymer Diodes Studied by Electrically Detected Magnetic Resonance Techniques,” Journal of Physical Chemistry C 123, 2611626123 (2019), https://doi.org/10.1021/acs.jpcc.9b07796.
43. N. Teshima, “Status of the DeeMe Experiment, an Experimental Search for µ−e Conversion at JPARC MLF,” PoS(NuFact2019)082 [5 pages] (2020), https://doi.org/10.22323/1.369.0082.
44. Yoshimichi Teratani, Rui Sakano, Akira Oguri, “Fermi Liquid Theory for Nonlinear Transport
through a Multilevel Anderson Impurity,” Phys. Rev. Lett. 125, 216801 [6 pages] (2020),
https://doi.org/10.1103/PhysRevLett.125.216801.
45. Kazuyuki Ogata, Carlos A. Bertulani, “Nuclear medium effect on neutron capture reactions
during neutron star mergers,” J. Phys. G: Nucl. Part. Phys. 47, 095101,
https://doi.org/10.1088/1361-6471/ab9d06.
46. Kazuyuki Ogata, Yohei Chiba, Yukinori Sakuragi, “Correspondence between α inelastic crosssections off 24 Mg and isoscalar monopole strengths,” arXiv:2001.09627 [nucl-th].
47. R. U. Abbasi, et al. (Telescope Array Collaboration), including S. Ogio and Y. Tsunesada,“Constraints on the diffuse photon flux with energies above 1018 eV using the surface detectorof the Telescope Array experiment,” Astropart. Phys. 110, 8-14 (2019),
https://doi.org/10.1016/j.astropartphys.2019.03.003.
48. Jihyun Kim, Dongsu Ryu, Hyesung Kang, Suk Kim, Soo-Chang Rey, “Filaments of galaxies asa clue to the origin of ultrahigh-energy cosmic rays,” Science Advances 5, eaau8227 [7 pages](2019), http://dx.doi.org/10.1126/sciadv.aau8227.

18

49. O. Adriani et al. (CALET Collaboration), including Y. Tsunesada, “Direct Measurement of theCosmic-Ray Proton Spectrum from 50 GeV to 10 TeV with the Calorimetric Electron Telescopeon the International Space Station,” Phys. Rev. Lett. 122, 181102 [8 pages] (2019),
http://dx.doi.org/10.1103/PhysRevLett.122.181102.
50. Shoichi Ogio for the Telescope Array collaboration, “Telescope Array Experiment,” EPJ Web ofConferences 208, 08002 [6 pages] (2019), https://doi.org/10.1051/epjconf/201920808002.
51. S. Ogio On behalf of the Telescope Array collaboration, “Highlights from the Telescope Arrayexperiment,” PoS(ICRC2019)013 [2 pages] (2019), https://pos.sissa.it/358/013/.
52. D. Bergman, J.F. Krizmanic, K. Nakai, Y. Omura, Y. Tsunesada, for the Telescope Array Collaboration, “First Results from NICHE and the NICHE-TALE Hybrid Detector,” PoS(ICRC2019)189[7 pages] (2019), https://pos.sissa.it/358/189/.
53. K. Kawata et al. for the Telescope Array Collaboration (including S. Ogio), “Updated Resultson the UHECR Hotspot Observed by the Telescope Array Experiment,” PoS(ICRC2019)310 [5pages] (2019), https://pos.sissa.it/358/310/.
54. Jihyun Kim, Dongsu Soonyoung Roh, Jihoon Ha, Hyesung Kang, “Propagation of ultra-highenergy cosmic rays in the magnetized cosmic web,” PoS(ICRC2019)315 [8 pages] (2019),
https://pos.sissa.it/358/315/.
55. R. Mayta Palacios, Y. Tsunesada, S. Ogio, for the Telescope Array Collaboration, “Time structure analysis of extensive air showers using the Telescope Array Data,” PoS(ICRC2019)347 [8pages] (2019), https://pos.sissa.it/358/347/.
56. T. Nonaka, R. Cady, R. Fujiwara, E. Kido, J. Matthews, S. Ogio, T. Okuda, H. Sagawaa, N.
Sakaki, S. Thomas, K. Yada, “Long distance network link for TAx4 expansion,” PoS(ICRC2019)372[8 pages] (2019), https://pos.sissa.it/358/372/.
57. S. Ogio, for the Telescope Array collaboration, “Telescope Array Low energy Extension(TALE)
Hybrid,” PoS(ICRC2019)375 [8 pages] (2019), https://pos.sissa.it/358/375/.
58. Y. Omura, K. Nakai, Y. Tsunesada, D. R Bergman, J. F Krizmanic, “NICHE detector andoperations,” PoS(ICRC2019)379 [7 pages] (2019), https://pos.sissa.it/358/379/.
59. T. Sako, et al. (including S. Ogio and Y. Tsunesada), “ALPACA air shower array to explore
100TeV gamma-ray sky in Bolivia,” PoS(ICRC2019)779 [8 pages] (2019),
https://pos.sissa.it/358/779/.
60. H. Kojima, et al. (including S. Ogio), “Correlation between Cosmic Ray Intensity Variations
Observed by the Large Acceptance GRAPES-3 Muon Telescope and Interplanetary Magnetic
Field,” PoS(ICRC2019)1151 [7 pages] (2019), https://pos.sissa.it/358/1151/.
61. Yoshiko Kanada-En’yo, Kazuyuki Ogata, “Transition properties of low-lying states in 28 Si probed
via inelastic proton and alpha scattering,” Phys. Rev. C 101, 064607 [13 pages] (2020),
https://doi.org/10.1103/PhysRevC.101.064607.
62. Tomo Nakagawa, Sosuke Inui, Makoto Tsubota, Hideo Yano, “Statistical laws and self-similarityof vortex rings emitted from a localized vortex tangle in superfluid 4 He,” Phys. Rev. B 101,
184515 [8 pages] (2020), https://doi.org/10.1103/PhysRevB.101.184515.
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63. H. Itoyama, Sota Nakajima, “Stability, enhanced gauge symmetry and suppressed cosmologicalconstant in 9D heterotic interpolating models,” Nucl. Phys. B 958, 115111 [24 pages] (2020),
https://doi.org/10.1016/j.nuclphysb.2020.115111.
64. Kazumasa Okabayashi, Nobuyuki Asaka, Ken-ichi Nakao, “Do black hole shadows merge?,”Phys. Rev. D 102, 044011 [11 pages] (2020),
https://doi.org/10.1103/PhysRevD.102.044011.
−
π−
π
65. Yoshiko Kanada-En’yo, Kazuyuki Ogata, “Properties of K π = 0+
1 , K = 2 , and K = 01
bands of 20 Ne probed via proton and alpha inelastic scattering,” Phys. Rev. C 101, 064308 [12pages] (2020), https://doi.org/10.1103/PhysRevC.101.064308.

66. Yoshimichi Teratani, Rui Sakano, Tokuro Hata, Tomonori Arakawa, Meydi Ferrier, Kensuke
Kobayashi, Akira Oguri, “Field-induced SU (4) to SU (2) Kondo crossover in a half-filling nanotube dot: Spectral and finite-temperature properties,” Phys. Rev. B 102, 165106 [23 pages](2020), https://doi.org/10.1103/PhysRevB.102.165106.
67. C. Matsuoka, K. Nishihara and T. Sano, “Nonlinear interfacial motion in magnetohydrodynamic
flows,” High Energy Density Phys. 31, 19-23 (2019),
https://doi.org/10.1016/j.hedp.2019.02.002.
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92. M. Berger et al. (Belle collaboration including M. Iwasaki), “Measurement of the decays Λc →
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95. A. Abdesselam et al. (Belle collaboration including M. Iwasaki), “Measurement of R(D) andR(D∗ ) with a semileptonic tagging method,” arXiv:1904.08794 [hep-ex].
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00
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99. S. Jia et al. (Belle collaboration including M. Iwasaki), “Observation of a vector charmoniumlike
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100. H. Li et al. (Belle collaboration including M. Iwasaki), “Azimuthal asymmetries of back-to-back
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101. P. K. Resmi et al. (Belle collaboration including M. Iwasaki), “First measurement of the CKM
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102. Y. Jin et al. (Belle collaboration including M. Iwasaki and E. Nakano), “Observation of τ − →π − ντ e+ e− and search for τ − → π − ντ µ+ µ− ,” Phys. Rev. D 100, no. 7, 071101(R) [9 pages](2019), https://doi.org/10.1103/PhysRevD.100.071101.
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103. S. Jia et al. (Belle collaboration including M. Iwasaki), “Search for Ω(2012) → KΞ(1530) →KπΞ at Belle,” Phys. Rev. D 100, no. 3, 032006 [11 pages] (2019) ,https://doi.org/10.1103/PhysRevD.100.032006.
104. P. C. Chou et al. (Belle collaboration including M. Iwasaki), “Search for B 0 → X(3872)γ,” Phys.
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105. K. Chilikin et al. (Belle collaboration including M. Iwasaki), “Evidence for B + → hc K + andobservation of ηc (2S) → pp̄π + π − ,” Phys. Rev. D 100, no. 1, 012001 [16 pages] (2019),
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106. R. Mizuk et al. (Belle collaboration including M. Iwasaki), “Observation of a new structure near
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107. Y. B. Li et al. (Belle collaboration including M. Iwasaki), “First measurements of absolutebranching fractions of the Ξ+c baryon at Belle,” Phys. Rev. D 100, no. 3, 031101(R) [8 pages](2019), https://doi.org/10.1103/PhysRevD.100.031101.
108. T. V. Dong, S. Uno, M. Uchida, H. Ozaki, N. Taniguchi, E. Nakano and K. Trabelsi, “Calibration
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109. V. Bhardwaj et al. (Belle collaboration including M. Iwasaki), “Search for X(3872) and X(3915)
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110. Y. T. Lai et al. (Belle collaboration including M. Iwasaki and E. Nakano), “Measurement ofbranching fraction and final-state asymmetry for the B̄ 0 → KS0 K ∓ π ± decay,” Phys. Rev. D 100,
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111. B. Pal et al. (Belle collaboration including M. Iwasaki), “Evidence for the decay B 0 → pp̄π 0 ,”Phys. Rev. D 99, no. 9, 091104(R) [8 pages] (2019),
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112. R. Seidl et al. (Belle collaboration including M. Iwasaki and E. Nakano), “Transverse momentum
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113. R. Garg et al. (Belle collaboration including M. Iwasaki), “Search for the B → Y (4260)K, Y (4260) →J/ψπ + π − decays,” Phys. Rev. D 99, no. 7, 071102(R) [8 pages] (2019),
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114. A. B. Kaliyar et al. (Belle collaboration including M. Iwasaki), “Measurements of branching
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115. Y. B. Li et al. (Belle collaboration including M. Iwasaki and E. Nakano), “First Measurementsof Absolute Branching Fractions of the Ξ0c Baryon at Belle,” Phys. Rev. Lett. 122, no. 8, 082001[7 pages] (2019), https://doi.org/10.1103/PhysRevLett.122.082001.
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117. J. B. Kim et al. (Belle collaboration including M. Iwasaki and E. Nakano), “Search for CP
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118. Y. Yusa et al. (Belle collaboration including M. Iwasaki and E. Nakano), “Measurement oftime-dependent CP violation in B 0 → KS0 π 0 π 0 decays,” Phys. Rev. D 99, no. 1, 011102(R) [7pages] (2019), https://doi.org/10.1103/PhysRevD.99.011102.
119. I. S. Seong et al. (Belle collaboration including M. Iwasaki and E. Nakano), “Search for a Light
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120. E. Waheed et al. (Belle collaboration including M. Iwasaki and E. Nakano), “Measurement of
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123. P. C. Lu et al. (Belle collaboration including M. Iwasaki), “Observation of B + → pΛ̄K + K − andB + → p̄ΛK + K + ,” Phys. Rev. D 99, no. 3, 032003 [9 pages] (2019),
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124. S. Watanuki et al. (Belle collaboration including M. Iwasaki), “Measurements of isospin asymmetry and difference of direct CP asymmetries in inclusive B → Xs γ decays,” Phys. Rev. D 99,
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9MEMBERS

Director

Hiroshi Itoyama, Graduate School of Science, Professor

Deputy Director

Nobuyuki Kanda, Graduate School of Science, Professor

Researchers

Masaki Arima, Graduate School of Science, Associate Professor
Yohei Chiba, Graduate School of Science, Assistant Professor with term
Hiromotsu Hamabata, Graduate School of Science, Associate Professor
Shin Inouye, Graduate School of Science, Professor
Hideki Ishihara, Graduate School of Science, Professor
Osamu Ishikawa, Graduate School of Science, Professor
Yousuke Itoh, Graduate School of Science, Associate Professor
Hiroshi Itoyama, Graduate School of Science, Professor (Director)
Masako Iwasaki, Graduate School of Science, Associate Professor
Nobuyuki Kanda, Graduate School of Science, Professor (Deputy Director)
Katsuichi Kanemoto, Graduate School of Science, Associate Professor
Nobuhito Maru, Graduate School of Science, Associate Professor
Sanefumi Moriyama, Graduate School of Science, Associate Professor
Eiichi Nakano, Graduate School of Science, Associate Professor
Ken-ichi Nakao, Graduate School of Science, Professor
Yuunori Nishikawa, Graduate School of Science, Lecturer
Ken Obara, Graduate School of Science, Lecturer
Kazuyuki Ogata, Graduate School of Science, Associate Professor(Cross appointment with Research Center for Nuclear Physics, Osaka University)
Shoichi Ogio, Graduate School of Science, Professor
Akira Oguri, Graduate School of Science, Professor
Takeshi Oota, Graduate School of Science, Associate Professor with term
Koichi Sato, Graduate School of Science, Lecturer with term
Yoshihiro Seiya, Graduate School of Science, Professor
Mitsuru Sugisaki, Graduate School of Science, Associate Professor
Hiromitsu Takeuchi, Graduate School of Science, Lecturer
Natsuki Teshima, Graduate School of Science, Assistant Professor with term
Makoto Tsubota, Graduate School of Science, Professor
Yoshiki Tsunesada, Graduate School of Science, Associate Professor
Kazuhiro Yamamoto, Graduate School of Science, Associate Professor
Masato Yamanaka, Graduate School of Science, Assistant Professor with term
Hideo Yano, Graduate School of Science, Associate Professor

Endowed Course: Laser Cooled Atom Lab

Shin Inouye, Graduate School of Science, Professor(Concurrent with the NITEP researcher)
Munekazu Horikoshi, Graduate School of Science, Associate Professor with term
Kohei Kato, Graduate School of Science, Assistant Professor with term

26

Concurrent Post Researchers

Hiroyuki Sakuragi, Vice President (Graduate School of Science)
Chihiro Matsuoka, Graduate School of Engineering, Professor

Special Researchers

Hidetoshi Awata, Graduate School of Mathematics, Nagoya University
Keitaro Fujita, Graduate School of Science
Hiroyuki Kanno, Graduate School of Mathematics, Nagoya University
Reiji Yoshioka, Osaka City Advanced Mathematical Institute27

Nambu Yoichiro Institute of Theoretical and Experimental Physics (NITEP),
Osaka City University,
3-3-138, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
https://www.nitep.osaka-cu.ac.jp/en/index.html