Workshop Report

Focus Week on Quantum Gravity and Holography
Masahito Yamazaki
Kavli IPMU Associate Professor

Our focus week“Focus Week on Quantum
Gravity and Holography”was held at Kavli IPMU onApril 2-6, 2018.
The search for the quantum theory of gravity
has been one of the most important subjects intheoretical physics for decades. While superstring
theory is widely believed to be a promising
candidate, the focus of the community for quite
some time has been the application of string theoryand holography to other areas (such as quark-gluon
plasma, condensed matter, and mathematics), andless so to quantum gravity per se. The situation has
rapidly been changing over the past few years; many
researchers are coming back to the field, armed
with new ideas (e.g., relationship between quantum
information and quantum gravity, Sachdev-YeKitaev model, ER=EPR proposal, and supergravity
on de Sitter space), or new techniques which cansolve old and difficult problems (e.g., holographic
entanglement entropy, new techniques based on
integrability, conformal bootstrap, and lattice superYang-Mills simulation).
In order to strengthen this trend, it was desirable
and timely to bring together top researchers
working in various different directions, encourage
the deepening of mutual understanding, anddiscuss next directions. This was the motivation for14

our focus week.
We had the fortune of having an internationalorganizing committee, including Tatsuo Azeyanagi,
Valentina Forini, Masanori Hanada, Bert Vercnocke,
Nico Wintergerst, and myself.
We had plenary talks by Monica Guica, Yuta
Hamada, Song He, Simeon Hellerman, Petr Horava,
Jared Kaplan, Ami Katz, Yasunori Nomura, Hirosi
Ooguri, Xiaoliang Qi, Suvrat Raju, Bo Sundborg, andNico Wintergerst. We also had invited contributedtalks, selected from among the applicants, byYuhma Asano, Kanato Goto, Goro Ishiki, AnoshJoseph, Rene Meyer, Max Riegler, Takahiro Uetoko,
Masataka Watanabe, and Yun-Long Zhang.
As an experiment, we organized this focus week
as a hybrid: we had a relaxed schedule for the first
three days with a lot of time for discussions, while
we had a more intense conference-style format inthe last two days.
I myself very much enjoyed attending this focusweek, talking with experts and getting ideas forpossible future projects. I also obtained positive
feedback about the focus week from many
participants. I do hope our focus week, while
limited in scope, provided an inspiration for future
fascinating activities in the field of quantum gravity
and holography.

Kavli IPMU News No. 42 June 2018

Workshop Report

Joint Kavli IPMU - ICEPP Workshop on New
Directions for LHC: Run 2 and Beyond
Satoshi Shirai
Kavli IPMU Assistant Professor

On June 18, 2018, we held the joint workshopof the Kavli IPMU and the International Center for
Elementary Particle Physics (ICEPP)“New Directionsfor LHC: Run 2 and Beyond”at Kavli IPMU. Kavli
IPMU and ICEPP had never hosted such a workshop
together and this is the first joint workshop.
The Large Hadron Collider (LHC) is now themost important experiment for elementary particlephysics. So far, the LHC has discovered the Higgs
particles and is now studying its mass and property
in detail. On the other hand, signatures of new
physics beyond the standard model are yet to befound. In this workshop, the latest results of the LHC
were reported and we discussed the future directionof particle physics in light of the LHC results.
First, Karl Jakobs, a spokesperson of the ATLASexperiment, gave a review on the latest LHC resultson the Higgs particle measurements and search
for new physics. He also discussed the prospectsof the future high luminosity LHC. Subsequent
speakers and the contents of their talks were as
follows. S. Shirai gave a talk on the status of thesupersymmetric models after the discovery of theHiggs particle, and emphasized the importance ofsearching for long-lived particles at the LHC.
Mihoko Nojiri reported her recent research on theprecise estimation of mono jet signals with coloredparticle productions, which play important roles forsearching new physics. Takahiro Terada talked about
a semi-analytic method to estimate the primordial
gravitational wave spectrum in cosmology. Michihisa
Takeuchi discussed the signatures of the Higgs pair
production and dark matter in the supersymmetricmodels at the future LHC. Finally, Junping Tiangave a nice review on the prospect of precise
measurement of the Higgs particle at the proposed
International Linear Collider (ILC).
In the panel discussion, we discussed the future
direction of the high luminosity LHC and synergy
with other experiments such as ILC, SuperKEKB,and Hyper-Kamiokande. Especially, we intensively
discussed precise measurements of the Higgs particle
and top quark in the future experiments.
Unfortunately, a strong earthquake hit Osaka thatmorning and talks by Shinya Kanemura and Yuji
Omura were canceled.
This workshop has brought together theoreticaland experimental physicists. We enjoyed astimulating discussion among participants. I hopethe second Kavli IPMU-ICEPP joint workshop will beheld in the near future.

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