East Asia Joint Symposium on
Fields and Strings 2021

Report of Contributions

https://indico.nitep.osaka-cu.ac.jp/e/80

East Asia Joint Sy … / Report of Contributions
Contribution ID: 5

Digital quantum simulation of the …
Type: Invited talk

Digital quantum simulation of the Schwinger modelwith topological term
Wednesday, 24 November 2021 11:30 (30 minutes)

Presenter: HONDA, Masazumi (YITP)

September 30, 2024

Page 1East Asia Joint Sy … / Report of Contributions

Finite-N superconformal index via …

Contribution ID: 6

Type: Invited talkFinite-N superconformal index via the AdS/CFT
correspondence
Tuesday, 23 November 2021 14:00 (30 minutes)
We propose a prescription to calculate the superconformal index of the N=4 U(N) supersymmetric
Yang-Mills theory with finite N on the AdS side. The finite N corrections are included as contributions of D3-branes wrapped around three-cycles in S5, which are calculated as the index of thegauge theories realized on the wrapped branes.

Presenter: IMAMURA, Yosuke (Tokyo Inst Tech)

September 30, 2024

Page 2East Asia Joint Sy … / Report of Contributions
Contribution ID: 7

Anomaly of subsystem symmetry …
Type: Invited talkAnomaly of subsystem symmetry and anomaly
inflow
Monday, 22 November 2021 15:15 (30 minutes)

Presenter: YAMAGUCHI, Satoshi (Osaka U)

September 30, 2024

Page 3

East Asia Joint Sy … / Report of Contributions
Contribution ID: 8

Effective Theory Breaks Down at S …
Type: Invited talkEffective Theory Breaks Down at Scrambling Time
Friday, 26 November 2021 17:30 (30 minutes)
For the background of a gravitational collapse, we calculate the amplitudes for infalling matterto radiate outgoing massless particles through higher-derivative interactions. The amplitudes arefound to grow exponentially with time, leading to the breakdown of the effective theory at thescrambling time.

Presenter: HO, Pei-Ming (National Taiwan U)

September 30, 2024

Page 4

East Asia Joint Sy … / Report of Contributions
Contribution ID: 9

How to multiply, add and expand …
Type: Invited talk

How to multiply, add and expand amplitudes intheory space
Tuesday, 23 November 2021 10:00 (30 minutes)

Presenter: HE, Song (ITP)

September 30, 2024

Page 5

East Asia Joint Sy … / Report of Contributions
Contribution ID: 10

Penrose Limit: A Stringy Regime i …
Type: Invited talkPenrose Limit: A Stringy Regime in Holography
Tuesday, 23 November 2021 11:00 (30 minutes)
Penrose limit provides a promising avenue to the stringy regime in the AdS/CFT holography, giving rise to the pp-wave background. Recently, we proposed a novel entry of the pp-wave holographic dictionary, which equated the Berenstein-Maldacena-Nastase (BMN) two-point functionsin free Yang-Mills theory with the norm squares of the quantum unitary transition amplitudes
between the corresponding tensionless strings in the infinite curvature limit. If our proposal iscorrect, it would not only provide first examples of systematic calculations of the higher genus critical superstring amplitudes, but may also in principle gives exact complete results for any string
coupling, due to the convergence of genus expansion.

Presenter: HUANG, Min-xin (USTC)

September 30, 2024

Page 6

East Asia Joint Sy … / Report of Contributions

Anisotropic Holography

Contribution ID: 11

Type: Invited talkAnisotropic Holography
Thursday, 25 November 2021 15:30 (30 minutes)
Strongly coupled anisotropic systems have significantly richer structure than the isotropic ones.
This is especially evident in the transport coefficients and in the phase diagram of anisotropic
theories. We discuss such holographic theories, we comment on their observables and demonstrate
how the isotropic universal relations are violated in presence of anisotropies. We also propose cfunction candidates for the anisotropic RG flows and show that their monotonicity is not any moreguaranteed by the energy conditions but depends on the theory characteristics.

Presenter: GIATAGANAS, Dimitrios (National Sun Yat-sen U)

September 30, 2024

Page 7

East Asia Joint Sy … / Report of Contributions

Conformal boundary condition an …

Contribution ID: 12

Type: Invited talkConformal boundary condition and AdS/BCFT
Monday, 22 November 2021 09:45 (30 minutes)
Conformal boundary condition was previously considered in the context of AdS/BCFT, wherein
the equation of motion of the end-of-the-world was derived and emphasized. In this talk, I will
discuss some other further consequences of the conformal boundary condition in AdS/BCFT. We
derive the boundary central charges of the holographic Weyl anomaly. We analysis the metricperturbation on the end-of-the-world brane with different boundary conditions. Our results revealthat there are non-trivial gravitational dynamics from extrinsic curvatures on the conformal andDirichlet branes, which may have interesting applications to the island.

Presenter: CHU, Chong-Sun (National Tsing-Hua U)

September 30, 2024

Page 8East Asia Joint Sy … / Report of Contributions
Contribution ID: 13

Twisted Compactification of 6d SC …
Type: Invited talkTwisted Compactification of 6d SCFTs
Tuesday, 23 November 2021 09:30 (30 minutes)
In this talk, we consider the circle compactification of 6d superconformal field theories with twist.
Especially, we focus on how to obtain their Omega-deformed partition functions and take theirCardy limit. We comment on its relation to the black hole physics.

Presenter: LEE, Kimyeong (KIAS)

September 30, 2024

Page 9

East Asia Joint Sy … / Report of Contributions

Bounds on gravitational S matrix

Contribution ID: 14

Type: Invited talkBounds on gravitational S matrix
Thursday, 25 November 2021 14:00 (30 minutes)

Presenter: HUANG, Yu-tin (National Taiwan U)

September 30, 2024

Page 10

East Asia Joint Sy … / Report of Contributions

Machine Learning Exploration of …

Contribution ID: 15

Type: Invited talkMachine Learning Exploration of Continuous
Symmetries in Physical Systems
Thursday, 25 November 2021 14:30 (30 minutes)

Presenter: CHEN, Heng-Yu (National Taiwan U)

September 30, 2024

Page 11East Asia Joint Sy … / Report of Contributions

Weak Cosmic Censorship for High …

Contribution ID: 16

Type: Invited talkWeak Cosmic Censorship for Higher Derivative
Gravity Theories
Monday, 22 November 2021 17:30 (30 minutes)
In this talk I will discuss how the weak cosmic censorship conjecture (WCCC) constrains the higher
derivative gravity theories based on Wald’s gedanken experiment by throwing the matter into theextremal or near-extremal black holes. We find that even though the WCCC still holds for theextremal black hole for the extremal black holes of quartic gravity theories, it can be violated forthe near-extremal cases.

Presenter: LIN, Feng-Li (National Taiwan Normal U)

September 30, 2024

Page 12East Asia Joint Sy … / Report of Contributions
Contribution ID: 17

Anomalies and Supersymmetry
Type: Invited talkAnomalies and Supersymmetry
Monday, 22 November 2021 13:45 (30 minutes)

Presenter: YI, Piljin (KIAS)

September 30, 2024

Page 13East Asia Joint Sy … / Report of Contributions
Contribution ID: 18

Quantum black holes from matrix …
Type: Invited talk

Quantum black holes from matrix models
Tuesday, 23 November 2021 13:30 (30 minutes)
I will explain the microscopic studies of BPS black holes in AdS from matrix models

Presenter: KIM, Seok (Seoul National U)

September 30, 2024

Page 14East Asia Joint Sy … / Report of Contributions
Contribution ID: 19

Yang-Baxter sigma models from 4 …
Type: Invited talkYang-Baxter sigma models from 4D Chern-Simons
theoryMonday, 22 November 2021 10:15 (30 minutes)
Recently, a 4D Cherns-Simons (CS) theory has been proposed by Costello and Yamazaki as a unified
theory of 2D classically integrable field theories. In this talk, I will explain how to derive YangBaxter sigma models from this 4D CS theory.

Presenter: YOSHIDA, Kentaroh (Kyoto U)

September 30, 2024

Page 15

East Asia Joint Sy … / Report of Contributions
Contribution ID: 20

Heavy-Heavy-Light Three-Point F …
Type: Invited talkHeavy-Heavy-Light Three-Point Functions fromD-branes Revisited
Friday, 26 November 2021 17:00 (30 minutes)
We study correlation functions of D-branes and a supergravity mode in AdS, which are dual tostructure constants of two sub-determinant operators with large charge and a BPS single-trace
operator. Our approach is inspired by the large charge expansion of CFT and resolves puzzles andconfusions in the literature on the holographic computation of correlation functions of heavy operators. In particular, we point out two important effects which are often missed in the literature; thefirst one is an average over classical configurations of the heavy state, which physically amounts
to projecting the state to an eigenstate of quantum numbers. The second one is the contribution
from wave functions of the heavy state. To demonstrate the power of the method, we first analyze
the three-point functions in N=4 super Yang-Mills and reproduce the results in field theory from
holography, including the cases for which the previous holographic computation gives incorrect
answers. We then apply it to ABJM theory and make solid predictions at strong coupling. Finally
we comment on possible applications to states dual to black holes and fuzzballs. This talk is basedon work done with Peihe Yang, Yunfeng Jiang and Shota Komatsu.

Presenter: WU, Jun-Bao (Tianjin University)

September 30, 2024

Page 16

East Asia Joint Sy … / Report of Contributions
Contribution ID: 21

Conformal anomalies a vs c
Type: Invited talkConformal anomalies a vs c
Tuesday, 23 November 2021 15:30 (30 minutes)

Presenter: SONG, Jaewon (KAIST)

September 30, 2024

Page 17

East Asia Joint Sy … / Report of Contributions
Contribution ID: 22

Defect Extremal Surface and Parti …
Type: Invited talkDefect Extremal Surface and Partial Reduction
Friday, 26 November 2021 13:30 (30 minutes)

Presenter: ZHOU, Yang (Fudan U)

September 30, 2024

Page 18

East Asia Joint Sy … / Report of Contributions
Contribution ID: 23

Compactness, Finiteness, and the S …
Type: Invited talkCompactness, Finiteness, and the SwamplandFriday, 26 November 2021 09:30 (30 minutes)
We demonstrate the validity of the String Lamppost Principle – that all consistent theories of quantum gravity are in the String Landscape – for supersymmetric theories in d > 6 using compactness
and connectedness of the moduli space of small instantons, as well as the classification of the associated Coulomb branch. We also argue that some of the swampland conjectures are viewed as
the prism of the finiteness of black hole entropy.

Presenter: HAMADA, Yuta (Harvard)

September 30, 2024

Page 19

East Asia Joint Sy … / Report of Contributions
Contribution ID: 24

Emergent Supersymmetry on the E …
Type: Invited talkEmergent Supersymmetry on the Edges
Wednesday, 24 November 2021 09:30 (30 minutes)

Presenter: LEE, Sungjay (KIAS)

September 30, 2024

Page 20

East Asia Joint Sy … / Report of Contributions
Contribution ID: 25

On Galilean Conformal Bootstrap
Type: Invited talk

On Galilean Conformal Bootstrap
Monday, 22 November 2021 11:15 (30 minutes)
In the past decade, the renaissance of conformal bootstrap has enriched our understanding of conformal field theory and AdS/CFT correspondence. It would be interesting to develop the bootstrap
program for other field theories with conformal-like symmetries. In this talk, I will introduce ourstudies on Galilean conformal bootstrap in the past few years.

Presenter: CHEN, Bin (PKU)

September 30, 2024

Page 21

East Asia Joint Sy … / Report of Contributions

M2-branes & Quantum Curves

Contribution ID: 26

Type: Invited talkM2-branes & Quantum Curves
Thursday, 25 November 2021 11:00 (30 minutes)

Presenter: MORIYAMA, Sanefumi (Osaka City U)

September 30, 2024

Page 22

East Asia Joint Sy … / Report of Contributions
Contribution ID: 27

FZZT branes in JT gravity and top …
Type: Invited talk

FZZT branes in JT gravity and topological gravity
Tuesday, 23 November 2021 17:00 (30 minutes)

Presenter: OKUYAMA, Kazumi (Shinshu U)

September 30, 2024

Page 23

East Asia Joint Sy … / Report of Contributions

3D rank 0 N=4 SCFTs and Non- …

Contribution ID: 28

Type: Invited talk3D rank 0 N=4 SCFTs and Non-unitary TQFTs
Tuesday, 23 November 2021 17:30 (30 minutes)

Presenter: GANG, Dongmin (Seoul National U)

September 30, 2024

Page 24

East Asia Joint Sy … / Report of Contributions
Contribution ID: 29

What happens when conifold tran …
Type: Invited talk

What happens when conifold transitions occur at theconifold singularities associated with matter
generation in F-theory?
Wednesday, 24 November 2021 10:00 (30 minutes)
A conifold is a singular Calabi-Yau 3-fold of the simplest type, and has played important roles invarious aspects of string theory. In fact, in F-theory, conifold singularities are quite commonplace;
conifold singularities typically appear, in “split models”, in most places where charged matter isgenerated. We show that the split/non-split transition is, except in certain exceptional cases, aconifold transition from the resolved to the deformed side, associated with the conifold singularities emerging where the codimension-one singularity is enhanced to D_{2k+2} (k ≥ 1) or E_7. Thisclarifies the origin of nonlocal matter in the non-split models, which has been a mystery for many
years.

Presenter: MIZOGUCHI, Shun’ya (KEK)

September 30, 2024

Page 25

East Asia Joint Sy … / Report of Contributions
Contribution ID: 30

5d/6d Wilson loops from blowups
Type: Invited talk

5d/6d Wilson loops from blowups
Thursday, 25 November 2021 09:30 (30 minutes)

Presenter: KIM, Hee-Cheol (POSTECH)

September 30, 2024

Page 26

East Asia Joint Sy … / Report of Contributions
Contribution ID: 31

Gravitational Positivity Bounds an …
Type: Invited talkGravitational Positivity Bounds and the Standard
Model
Thursday, 25 November 2021 10:00 (30 minutes)
Positivity bounds on low-energy scattering amplitudes provide a criterion for a low-energy effective theory to have a standard UV completion. When applied to gravitational theories, they are
expected to imply non-trivial quantum gravity constraints on quantum field theory models, i.e.,swampland conditions. In this talk I will introduce recent developments on positivity bounds ingravitational theories and their implications for the Standard Model of particle physics.

Presenter: NOUMI, Toshifumi (Kobe U)

September 30, 2024

Page 27

East Asia Joint Sy … / Report of Contributions
Contribution ID: 32

Topological pseudo entropy
Type: Invited talk

Topological pseudo entropy
Friday, 26 November 2021 10:00 (30 minutes)

Presenter: NISHIOKA, Tatsuma (YITP)

September 30, 2024

Page 28

East Asia Joint Sy … / Report of Contributions
Contribution ID: 33

Causal Shadow and modular flow …
Type: Invited talkCausal Shadow and modular flow in AdS/CFT: thedegenerate case
Friday, 26 November 2021 11:30 (30 minutes)

Presenter: WANG, Huajia (KITP)

September 30, 2024

Page 29

East Asia Joint Sy … / Report of Contributions
Contribution ID: 34

Kramers-Wannier-like duality defe …
Type: Invited talk

Kramers-Wannier-like duality defects in (3 + 1)dgauge theories
Friday, 26 November 2021 15:00 (30 minutes)
The 1+1d Majorana fermion has a chiral Z2 symmetry, which is “broken” after gauging the nonchiral fermion parity due to their mixed anomaly. However, it is better to think that the symmetry
is preserved even after gauging, in the form of topological defect, and the defect implements the
Kramers-Wannier self-duality of the Ising CFT. In this talk I will talk about an analogue of this story
for some examples of (3+1)d continuum QFTs. In particular I will explicitly construct topologicaldefects associated to self-dualities under gauging a one-form (aka center) symmetry of QFTs.

Presenter: OHMORI, Kantaro (U of Toyo)

September 30, 2024

Page 30

East Asia Joint Sy … / Report of Contributions
Contribution ID: 35

A BMS-invariant free scalar model
Type: Invited talkA BMS-invariant free scalar model
Friday, 26 November 2021 15:30 (30 minutes)
The BMS (Bondi-van der Burg-Metzner-Sachs) symmetry arises as the asymptotic symmetry offlat spacetime at null infinity, suggesting a holographic duality between Einstein gravity andsome quantum field theory with BMS invariance. In particular, the BMS algebra in three dimensions is generated by super-rotation generators which form a Virasoro sub-algebra, together withmutually-commuting super-translation generators. In this talk, I will first review flat holography
in three dimensions, and then describe a free scalar model in two dimensions exhibiting BMS
symmetry.

Presenter: SONG, Wei (Tsinghua U)

September 30, 2024

Page 31East Asia Joint Sy … / Report of Contributions

Order defect in 4D Chern-Simons …

Contribution ID: 36

Type: Short talk at the venue

Order defect in 4D Chern-Simons theory
Monday, 22 November 2021 11:45 (15 minutes)
The 4D Chern-Simons (CS) theory is a unifying framework of 2D integrable field theories andlattice models. Derivations of integrable field theories from 4D CS theories are based on twoclasses: order and disorder defects. We develop the aspect of order defects, and derive integrable
field theories such as the Faddeev-Reshetikhin model. This approach further admits integrable
deformations of the model by adopting appropriate boundary conditions.

Presenter: FUKUSHIMA, Osamu (Kyoto University)
Session Classification: Short talks

September 30, 2024

Page 32

East Asia Joint Sy … / Report of Contributions
Contribution ID: 37

The AdS5×S5 superstring from 4D …
Type: Short talk online (Zoom)

The AdS5×S5 superstring from 4D Chern-Simons
theoryMonday, 22 November 2021 12:00 (15 minutes)
Recently, a unified picture to describe integrable systems has been established by Costello, Witten
and Yamazaki. In the case of 2D integrable field theories, Costello and Yamazaki proposed that bystarting from a certain 4D Chern-Simons (CS) theory, one can construct classically integrable field
theories systematically by taking a meromorphic 1-form and adopting an appropriate boundary
condition. In this talk, I will explain how the AdS5×S5 supercoset sigma model and its integrable
deformations can be reproduced from a 4D CS theory by generalizing the procedure for the 2D
principal chiral model developed by Delduc et al [arXiv:1909.13824].
This talk is based on works (2003.07309, 2005.04950) with Osamu Fukushima and Kentaroh Yoshida
in Kyoto University.

Presenter: SAKAMOTO, Junichi
Session Classification: Short talks

September 30, 2024

Page 33

East Asia Joint Sy … / Report of Contributions
Contribution ID: 38

A physicist-friendly reformulation …
Type: Short talk online (Zoom)

A physicist-friendly reformulation of the APS index(on a lattice)
Monday, 22 November 2021 14:15 (15 minutes)
The Atiyah-Singer(AS) index theorem on a closed manifold is well understood and appreciatedin physics. On the other hand, the Atiyah-Patodi-Singer(APS) index, which is an extension to amanifold with boundary, is physicist-unfriendly, in that it is formulated with a nonlocal boundary
condition. Recently we (3 physicists and 3 mathematicians) proved that the same index as APS
is obtained from the domain-wall fermion Dirac operator. Our theorem indicates that the index
can be expressed without any nonlocal conditions, in such a physicist-friendly way that application to the lattice gauge theory is straightforward. The domain-wall fermion provides a natural
mathematical foundation for understanding the bulk-edge correspondence of the anomaly inflow.

Presenter: FUKAYA, Hidenori (Osaka U)
Session Classification: Short talks

September 30, 2024

Page 34

East Asia Joint Sy … / Report of Contributions
Contribution ID: 39

Chaotic string dynamics in deform …
Type: Short talk at the venue

Chaotic string dynamics in deformed 1,1
Monday, 22 November 2021 14:30 (15 minutes)
Recently, Arutyunov, Bassi and Lacroix have shown that 2D non-linear sigma model with a deformed T1,1 background is classically integrable. This background includes a Kalb-Ramond twoform with a critical value. Then the sigma model has been conjectured to be non-integrable when
the two-form is off critical. With a winding string ansatz, the system is reduced to a dynamical system described by a set of ordinary differential equations. Then we find classical chaos bynumerically computing Poincaré sections and Lyapunov spectra for some initial conditions.

Presenter: KUSHIRO, Shodai (Kyoto U)
Session Classification: Short talks

September 30, 2024

Page 35East Asia Joint Sy … / Report of Contributions
Contribution ID: 41

Topological defect junctions in 4- …
Type: Short talk at the venue

Topological defect junctions in 4-dimensional pureZ2 gauge theory
Monday, 22 November 2021 15:45 (15 minutes)
Recently, there are many studies about expanding concepts of symmetries and its applications. Oneof the directions is to treat non-invertible objects as “”symmetry””. We explicitly constructed a noninvertible defect of duality and a 1-form center symmetry defect in 4D lattice pure Z2 gauge theory.
In this talk, we will describe the junction that occurs where the two defects overlap. The duality
operator is non-invertible, so it is not necessary to be invariant under deformations that change
the topology. We can make the topological relational closed for such deformations including 1form center symmetry defects and junctions. This work is in collaboration with M.koide andS.Yamaguchi.

Presenter: NAGOYA, Yuta (Osaka U)
Session Classification: Short talks

September 30, 2024

Page 36East Asia Joint Sy … / Report of Contributions
Contribution ID: 42

Three-Body Effective Potential in …
Type: Short talk online (Zoom)

Three-Body Effective Potential in General Relativity
at 2PM and Resulting PN Contributions
Monday, 22 November 2021 16:00 (15 minutes)
In this talk, I will talk about the Post-Newtonian expansion of the gravitational three-body effective potential at the 2nd Post-Minkowskian order. At order 2PM a formal result is given in terms ofa differential operator acting on the maximal generalized cut of the one-loop triangle integral. We
perform the PN expansion unambiguously at the level of the integrand. Finding agreement withthe 2PN three-body potential after integration, we explicitly present new G^2 v^4-contributions atorder 3PN and outline the generalization to G^2 v^{2n}. The integrals that represent the essential
input for these results respect a non-local Yangian symmetry and are obtained by applying the recent bootstrapping method directly to their ε-expansion around three dimensions. The coordinate
space Yangian generator that we employ to obtain these integrals can be understood as a special
conformal symmetry in a dual momentum space. If time permits, I will also talk about our workin progress on finding such integrals of generic half-integer propagator powers.

Presenter:

WANG, Tianheng (Institute of Theoretical Physics of the Chinese Academy of Science,
Humboldt University of Berlin)

Session Classification: Short talks

September 30, 2024

Page 37

East Asia Joint Sy … / Report of Contributions

On compatibility between Confor …

Contribution ID: 43

Type: Short talk online (Zoom)

On compatibility between Conformal symmetry andContinuous higher-form symmetries
Monday, 22 November 2021 17:00 (15 minutes)
We will discuss the compatibility between the conformal symmetry together with the unitarity
and the continuous higher-form symmetries. We show that the d-dimensional unitary conformal
field theories are not consistent with continuous p-form symmetries for certain (d,p), assumingthat the corresponding conserved current is a conformal primary operator. We further discuss
several dynamical applications of this constraint. In particular, we show that some gapless, scale
invariant quantum field theories are not CFTs.

Presenter: ZHENG, Yunqin (Kavli IPMU, ISSP, U.Tokyo)
Session Classification: Short talks

September 30, 2024

Page 38

East Asia Joint Sy … / Report of Contributions
Contribution ID: 44

Multi-Soliton Dynamics of Anti- …
Type: Short talk online (Zoom)

Multi-Soliton Dynamics of Anti-Self-Dual Gauge
FieldsMonday, 22 November 2021 17:15 (15 minutes)
We study dynamics of multi-soliton solutions of anti-self-dual Yang-Mills equations for G = GL(2,C) in four-dimensional spaces. The one-soliton solution can be interpreted as a codimension-one
soliton in four-dimensional spaces because the principal peak of action density localizes on a threedimensional hyperplane. We call it the soliton wall. We prove that in the asymptotic region,
the n-soliton solution possesses n isolated localized lumps of action density, and interpret it as nintersecting soliton walls. More precisely, each action density lump is essentially the same as asoliton wall because it preserves its shape and “”velocity”” except for a position shift of principal
peak in the scattering process. The position shift results from the nonlinear interactions of themulti-solitons and is called the phase shift. We calculate the phase shift factors explicitly and findthat the action densities can be real-valued in three kind of signatures. Finally, we show that thegauge group can be G = SU(2) in the Ultrahyperbolic space U (the split signature (+,+,-,-). Thisimplies that the intersecting soliton walls could be realized in all region in N=2 string theories. It
is remarkable that quasideterminants dramatically simplify the calculations and proofs.

Presenter: HUANG, Shan-Chi (Nagoya U)
Session Classification: Short talks

September 30, 2024

Page 39

East Asia Joint Sy … / Report of Contributions
Contribution ID: 45

Regge conformal blocks from the …
Type: Short talk online (Zoom)

Regge conformal blocks from the Rindler-AdS blackhole and the pole-skipping phenomena
Tuesday, 23 November 2021 11:30 (15 minutes)
We study a holographic construction of conformal blocks in the Regge limit of four-point scalarcorrelation functions by using coordinates of the two-sided Rindler-AdS black hole. As a generalization of geodesic Witten diagrams, we construct diagrams with four external scalar fields in the
Rindler-AdS black hole by integrating over two half-geodesics between the centers of Penrose diagrams and points at the AdS boundary. We demonstrate that late-time behaviors of the diagrams
coincide with the Regge behaviors of conformal blocks. We also point out their relevance with thepole-skipping phenomena by showing that the near-horizon analysis of symmetric traceless fields
with any integer spin in the Rindler-AdS black hole can capture the Regge behaviors of conformal
blocks.

Presenter: NISHIDA, Mitsuhiro (Gwangju Institute of Science and Technology)
Session Classification: Short talks

September 30, 2024

Page 40East Asia Joint Sy … / Report of Contributions
Contribution ID: 46

Aspects of 5d Seiberg-Witten Theo …
Type: Short talk online (Zoom)

Aspects of 5d Seiberg-Witten Theories on S^1
Tuesday, 23 November 2021 11:45 (15 minutes)
We study the 5D N=1 Yang-Mills theory compactified on a circle, focusing on the Coulomb branch.
The compactified theory has a very complicated wall-crossing pattern, but on the other hand, there
seems to be no wall-crossing for 5d theory. In this talk, I will keep track of the wall-crossing
phenomenon from compactified theory to its 5d limit, and see how the wall-crossing turns off.
We find the elliptic genera of magnetic BPS strings do wall-cross and retain the memory of 4dwall-crossings.

Presenter: JIA, Qiang (KIAS)
Session Classification: Short talks

September 30, 2024

Page 41East Asia Joint Sy … / Report of Contributions
Contribution ID: 47

E-strings, E8 Weyl invariant Jaco …
Type: Short talk online (Zoom)

E-strings, E8 Weyl invariant Jacobi forms andConway invariant Jacobi forms on Leech lattice
Tuesday, 23 November 2021 14:30 (15 minutes)
In 1992 Wirthmuller showed that for any root system of type A,B,C,D,G,F and E6,E7, the ring of
weak Jacobi forms invariant under Weyl group is a polynomial algebra. However, it has recently
been proved that for E8 the ring is not a polynomial algebra. I will present how to describe E8
Weyl invariant Jacobi forms properly, both weak and holomorphic, and also how to used themin the modular bootstrap of elliptic genera of E-strings. For example, we prove that for any Weyl
invariant E8 Jacobi form \phi_t of index t the function E4^[t/5]\Delta^[5t/6]\phi_t can be expresseduniquely as a polynomial in E4, E6 and Sakai’s nine Ai, Bj forms. This is based on a joint workwith Haowu Wang arXiv:2109.10578.

Presenter: SUN, Kaiwen (KIAS)
Session Classification: Short talks

September 30, 2024

Page 42East Asia Joint Sy … / Report of Contributions
Contribution ID: 48

Wall-crossing of TBA equations an …
Type: Short talk online (Zoom)

Wall-crossing of TBA equations and WKB periods
for the higher order ODE
Tuesday, 23 November 2021 14:45 (15 minutes)
We study the WKB periods for the (r + 1)-th order ordinary differential equation (ODE) withpolynomial potential which is obtained by the Nekrasov-Shatashvili limit of (Ar , AN ) ArgyresDouglas theory in Omega background. We derive the thermodynamic Bethe ansatz (TBA) equations governing the exact WKB periods, which provides a generalization of the ODE/IM correspondence. Varying the moduli space parameters of the potential, one observes the wall-crossing of the
TBA equations. When the potential is monomimal type, we show the TBA equations obtained fromthe (A2 , A2 ) and (A2 , A3 )-type ODE lead to the D4 and E6 -type TBA equations respectively. This
talk is based on the work (hep-th/2104.13680) in collaboration with Katsushi Ito, Takayasu Kondo
and Kohei Kuroda and the work in progress.

Presenter:

SHU, Hongfei (Beijing Institute of Mathematical Sciences and Applications (BIMSA))

Session Classification: Short talks

September 30, 2024

Page 43

East Asia Joint Sy … / Report of Contributions
Contribution ID: 49

An alternative bulk construction b …
Type: Short talk at the venue

An alternative bulk construction by the flow
equation
Tuesday, 23 November 2021 16:00 (15 minutes)
We propose a new method to construct the bulk theory in d + 1 dimensions from d dimensional
field theory, using a so-called fundamental flow. We show that the conformal symmetry at theboundary is converted to the AdS isometry in the bulk even at the quantum level. We define themetric operators, whose VEV describes the AdS space. We derive the GKP-Witten formula for thebulk scalar field. We finally show that the metric becomes asymptotic AdS in the presence of thescalar primary at the boundary.

Presenter: AOKI, Sinya (YITP)
Session Classification: Short talks

September 30, 2024

Page 44East Asia Joint Sy … / Report of Contributions
Contribution ID: 50

Free energy and defect C-theorem …
Type: Short talk at the venue

Free energy and defect C-theorem in free theory
Tuesday, 23 November 2021 16:15 (15 minutes)
We describe conformal defects of p dimensions in a free theory on a d-dimensional flat space
as boundary conditions on the conformally flat space Hp+1×Sd−p−1. We classify two types ofboundary conditions, Dirichlet type and Neumann type, on the boundary of the subspace Hp+1
which correspond to the types of conformal defects in the free theory. We find Dirichlet boundary conditions always exist while Neumann boundary conditions are allowed only for defects oflower codimensions. Our results match with a recent classification of the non-monodromy defects,
showing Neumann boundary conditions are associated with non-trivial defects. We check this observation by calculating the difference of the free energies on Hp+1×Sd−p−1 between Dirichlet andNeumann boundary conditions. We also examine the defect RG flows from Neumann to Dirichletboundary conditions and provide more support for a conjectured C-theorem in defect CFTs.

Presenter: SATO, Yoshiki (Tohoku U)
Session Classification: Short talks

September 30, 2024

Page 45

East Asia Joint Sy … / Report of Contributions
Contribution ID: 51

Nonvanishing finite scalar mass in …
Type: Short talk at the venue

Nonvanishing finite scalar mass in flux
compactification
Wednesday, 24 November 2021 11:00 (15 minutes)
We study possibilities to realize a nonvanishing finite Wilson line (WL) scalar mass in flux compactification. Generalizing loop integrals in the quantum correction to WL mass at one-loop, wederive the conditions for the loop integrals and mode sums in one-loop corrections to WL scalarmass to be finite. We further guess and classify the four-point and three-point interaction terms
satisfying these conditions. As an illustration, the nonvanishing finite WL scalar mass is explicitly shown in a six dimensional scalar QED by diagrammatic computation and effective potential
analysis. This is the first example of finite WL scalar mass in flux compactification.

Presenter: HIROSE, Takuya (Osaka City U)
Session Classification: Short talks

September 30, 2024

Page 46

East Asia Joint Sy … / Report of Contributions

Target space duality of non- …

Contribution ID: 52

Type: Short talk at the venue

Target space duality of non-supersymmetric string
theoryWednesday, 24 November 2021 11:15 (15 minutes)
The target space duality of string theory without spacetime supersymmetry, which is constructedby splitting the Narain lattice by a shift-vector with order 2, is investigated. We show that the duality symmetry of such a model is obtained by imposing a congruence condition on O (dL , dR , Z),
that is, the non-supersymmetric string model is invariant under a congruence subgroup of O (dL , dR , Z).

Presenter: NAKAJIMA, Sota (Osaka City U)
Session Classification: Short talks

September 30, 2024

Page 47

East Asia Joint Sy … / Report of Contributions

Basis decompositions of genus-one …

Contribution ID: 53

Type: Short talk online (Zoom)

Basis decompositions of genus-one string integrals
Thursday, 25 November 2021 11:30 (15 minutes)
One-loop scattering amplitudes in string theories involve configuration-space integrals over genusone surfaces with coefficients of Kronecker-Eisenstein series in the integrand. A conjectural basisof integrands under Fay identities and integration by parts was recently constructed out of chainsof Kronecker-Eisenstein series. In this work, we decompose a variety of more general genusone integrands into the conjectural chain basis. The explicit form of the expansion coefficients isworked out for infinite families of cases where the Kronecker-Eisenstein series form loops. Our
results can be used to simplify multiparticle scattering amplitudes in supersymmetric, heterotic
and bosonic string theories. The multitude of basis reductions in this work strongly validate therecently proposed chain basis.

Presenter: ZHANG, Yong (Perimeter institute)
Session Classification: Short talks

September 30, 2024

Page 48

East Asia Joint Sy … / Report of Contributions
Contribution ID: 54

Worldsheet Variables for Cluster C …
Type: Short talk online (Zoom)

Worldsheet Variables for Cluster Configuration
SpacesThursday, 25 November 2021 11:45 (15 minutes)
We introduce worldsheet variables for a certain moduli space associated with a Dynkin diagramof finite type. The construction is based on gluing a pair of A-type quivers. We find new nonlinear
factors that characterize such spaces as hypersurface arrangement complement. We study various
topological properties using a finite-field method and propose conjectures about quasi-polynomial
point count, dimensions of cohomology, and Euler characteristics for the Dn space up to n=10.
These new variables have applications for string integrals, cluster alphabets, etc.

Presenter: ZHAO, Peng (Institute of Theoretical Physics, Chinese Academy of Sciences)Session Classification: Short talks

September 30, 2024

Page 49

East Asia Joint Sy … / Report of Contributions
Contribution ID: 55

Complex Langevin studies of the e …
Type: Short talk at the venue

Complex Langevin studies of the emergent
space-time in the type IIB matrix model
Thursday, 25 November 2021 16:00 (15 minutes)
We perform numerical studies of the type IIB matrix model, which was proposed as a nonperturbative formulation of superstring theory in 1996. The complex Langevin method is used in order toovercome the sign problem, which occurs in applying Monte Carlo methods. In particular, we investigate how the signature of the space-time is determined dynamically in this model, and discuss
the possibility of the emergence of the (3+1)D expanding universe.

Presenter: HATAKEYAMA, Kohta (KEK)
Session Classification: Short talks

September 30, 2024

Page 50

East Asia Joint Sy … / Report of Contributions
Contribution ID: 56

Entanglement entropy in Schwarz …
Type: Short talk online (Zoom)

Entanglement entropy in Schwarzschild spacetime
Friday, 26 November 2021 11:00 (15 minutes)
Recently, it is proposed that the Hawking radiation contains the information of a region inside
the horizon called islands. In the calculation of the entanglement entropy of the Hawking radiation, the dominant contribution comes from the configuration with wormholes between replica
geometries. Thus, the entanglement entropy of the Hawking radiation effectively includes the contribution from the island. In this talk, I will discuss the entanglement entropy in the Schwarzschildspacetime, and its relation to the vacuum state of matter fields.

Presenter: MATSUO, Yoshinori (Kyoto U)
Session Classification: Short talks

September 30, 2024

Page 51East Asia Joint Sy … / Report of Contributions
Contribution ID: 57

Entanglement entropy in interacti …
Type: Short talk at the venue

Entanglement entropy in interacting field theories
Friday, 26 November 2021 11:15 (15 minutes)
Entanglement entropy (EE) in field theory has been discussed as a measure for quantum entanglement between spatially separated regions. While there are a lot of studies on EE in CFT andfree theories, EE in general interacting field theories is of interest in an attempt to associate theeffect of the entanglement with low-energy physics. In this talk, I introduce our study on EE ininteracting field theories with a subregion of a half space. There, some contributions to EE canbe expressed in terms of renormalized correlators of fundamental and composite operators. Moreover, by combining the result with the notion of the Wilsonian RG, we discuss the possibility thatEE relevant to low-energy effective theories consists only of those contributions.
This talk is based on 2103.05303, 2105.02598, 2105.14834 and our recent work in progress.

Presenter: SAKAI, Katsuta (KEK)
Session Classification: Short talks

September 30, 2024

Page 52

East Asia Joint Sy … / Report of Contributions
Contribution ID: 58

Target space entanglement in qua …
Type: Short talk at the venue

Target space entanglement in quantum mechanics offermions and matrices
Friday, 26 November 2021 14:00 (15 minutes)
I will introduce the notion of target space entanglement. Quantum entanglement is closely related
to the structure of spacetime in quantum gravity. For quantum field theories or statistical models,
we usually consider the base space entanglement. However, target space instead of base spacesometimes directly connects to our spacetime, for example, perturbative string theories. We thus
need target space entanglement. To define the target space entanglement, we have to generalize
the definition of the conventional entanglement entropy. I will explain this generalization andapply it to the first quantized particles, in particular, fermions.

Presenter: SUGISHITA, Sotaro (Nagoya U)
Session Classification: Short talks

September 30, 2024

Page 53

East Asia Joint Sy … / Report of Contributions

Quantum information metric in th …

Contribution ID: 59

Type: Short talk at the venue

Quantum information metric in the gauge/gravity
correspondence
Friday, 26 November 2021 14:15 (15 minutes)
We study how information geometry is described by bulk geometry in the gauge/gravity correspondence. We consider a quantum information metric that measures the distance between the
ground states of two field theories, where one is obtained by perturbing the other. We find a universal formula that represents the quantum information metric in terms of back reaction to thebulk geometry. This talk is based on JHEP 06 (2020) 107 (arXiv:2002.11365) and a forthcoming
paper.

Presenter: YAMASHIRO, Kazushi (Shizuoka University)
Session Classification: Short talks

September 30, 2024

Page 54

East Asia Joint Sy … / Report of Contributions

Ginzburg-Landau effective action f …

Contribution ID: 60

Type: Short talk online (Zoom)

Ginzburg-Landau effective action for a fluctuating
holographic superconductor
Friday, 26 November 2021 16:00 (15 minutes)
Under holographic prescription for Schwinger-Keldysh closed time contour for non-equilibrium
system, we consider fluctuation effect of the order parameter in a holographic superconductor
model. Near the critical point, we derive the time-dependent Ginzburg-Landau effective action
governing dynamics of the fluctuating order parameter. In a semi-analytical approach, the timedependent Ginzburg-Landau action is computed up to quartic order of the fluctuating order parameter, and first order in time derivative.

Presenter: FUJITA, Mitsutoshi (Sun Yat-Sen University)
Session Classification: Short talks

September 30, 2024

Page 55

East Asia Joint Sy … / Report of Contributions
Contribution ID: 61

Holographic β function in de Sitter …
Type: Short talk online (Zoom)

Holographic β function in de Sitter space
Friday, 26 November 2021 16:45 (15 minutes)
We investigate infrared logarithms in inflationary Universe from holographic perspective. We
derive gravitational Fokker-Planck and Langevin equations to investigate the time evolution of
the de Sitter entropy S = π/GN H 2 (t). H(t) is the time dependent effective Hubble parameter
and GN is the Newton’s constant. Our approach focuses on the conformal modes to respect local
Lorentz symmetry. In term of the curvature perturbations , it is shown to be consistent with
δN formalism. Under the Gaussian approximation, we obtain the dynamical β function of g =1/S. The dimensionless gravitational coupling g is asymptotically free toward the future. It also
possesses the ultraviolet fixed point indicating that the Universe begun with the de Sitter expansion
at the Planck scale with ϵ = 0. We further interpret inflationary Universes as the UV complete
composite states. Since our analysis is trustable for small g, our conclusion is that inflationary
universe is consistent in the semiclassical regime.

Presenter: KITAZAWA, Yoshihisa (KEK)
Session Classification: Short talks

September 30, 2024

Page 56

East Asia Joint Sy … / Report of Contributions

Hawking radiation from squashed …

Contribution ID: 62

Type: Poster presentation

Hawking radiation from squashed Kaluza-Klein
black holes with quantum gravity effects
Thursday, 25 November 2021 16:45 (1h 15m)
We study the Hawking radiation from the five-dimensional charged static squashed Kaluza-Klein
black hole by the tunneling of charged fermions and charged scalar particles, including the phenomenological quantum gravity effects predicted by the generalized uncertainty principle withthe minimal measurable length. We derive corrections of the Hawking temperature to generalrelativity, which are related to the energy of the emitted particle, the size of the compact extra
dimension, the charge of the black hole and the existence of the minimal length in the squashed
Kaluza-Klein geometry. We show that the quantum gravity effect may slow down the increaseof the Hawking temperature due to the radiation, which may lead to the thermodynamic stableremnant of the order of the Planck mass after the evaporation of the squashed Kaluza-Klein black
hole. We also find that the sparsity of the Hawking radiation may become infinite when the massof the squashed Kaluza-Klein black hole approaches its remnant mass.

Presenter: MATSUNO, Ken (Osaka City University)
Session Classification: Poster Session

September 30, 2024

Page 57

East Asia Joint Sy … / Report of Contributions

Higher derivative extension of the …

Contribution ID: 63

Type: Poster presentation

Higher derivative extension of the functional
renormalization group
Thursday, 25 November 2021 16:45 (1h 15m)
We study higher derivative extension of the functional renormalization group (FRG).We consider
the general form of the FRG equations for a scalar field that include higher functional derivatives
with respect to the field. We show that the epsilon expansion around the Wilson-Fisher fixed point
is indeed reproduced by the local potential approximation of the general FRG equations.

Presenter: TANAKA, Gota (Shizuoka University)
Session Classification: Poster Session

September 30, 2024

Page 58

East Asia Joint Sy … / Report of Contributions

Holographic index calculation for …

Contribution ID: 64

Type: Poster presentation

Holographic index calculation for Argyres-Douglas
and Minahan-Nemeschansky theories
Thursday, 25 November 2021 16:45 (1h 15m)
We calculate the superconformal indices of the N=2 superconformal field theories realized on N
coincident D3-branes in 7-brane backgrounds with constant axiodilaton via the AdS/CFT correspondence. We include the finite-N corrections as the contribution of D3-branes wrapped around
3-cycles in the internal space. We take only single-wrapping contributions into account for simplicity. We also determine the orders of the next-to-leading corrections which we do not calculate.
The orders are relatively high, and we obtain many trustable terms. We give the results for N=1,2,3
explicitly, and find nice agreement with known results.
Reference: arXiv:2110.14897

Presenter: MURAYAMA, Shuichi (Tokyo Institute of Technology)
Session Classification: Poster Session

September 30, 2024

Page 59

East Asia Joint Sy … / Report of Contributions

Non-split singularities and conifol …

Contribution ID: 65

Type: Poster presentation

Non-split singularities and conifold transitions inF-theory
Thursday, 25 November 2021 16:45 (1h 15m)
In F-theory, if a fiber type of an elliptic fibration involves a condition that requires an exceptional
curve to split into two irreducible components, it is called “split” or “non-split” type dependingon whether it is globally possible or not. In the latter case, the gauge symmetry is reduced toa non-simply-laced Lie algebra due to monodromy. We show that the transition from a split toa non-split model is, except in certain exceptional cases, a conifold transition from the resolved
to the deformed side, associated with the conifold singularities emerging at the codimension-twoloci where the codimension-one singularity is enhanced to D2k+2 (k ≥ 1) or E7 . This clarifies theorigin of non-local matter in the non-split case, which has been a mystery for many years.
Reference: arXiv:2108.10136 [hep-th], 2008.09272 [hep-th]

Presenter: KURAMOCHI, Rinto (SOKENDAI/KEK)
Session Classification: Poster Session

September 30, 2024

Page 60

East Asia Joint Sy … / Report of Contributions

Opening

Contribution ID: 66

Type: not specified

Opening
Monday, 22 November 2021 09:30 (15 minutes)
Hiroshi Itoyama (Osaka City U)

Session Classification: Opening

September 30, 2024

Page 61East Asia Joint Sy … / Report of Contributions

Closing

Contribution ID: 67

Type: not specified

Closing
Friday, 26 November 2021 18:00 (15 minutes)
Satoshi Iso (KEK) and Kimyeong Lee (KIAS)

Session Classification: Closing

September 30, 2024

Page 62