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BEGIN:VEVENT
SUMMARY:TBA
DTSTART:20231129T071500Z
DTEND:20231129T073000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4852@conference-indico.kek.jp
DESCRIPTION:Speakers: Mohammad Akhond (Kyoto University)\n\nTBA\n\nhttps:/
/conference-indico.kek.jp/event/231/contributions/4852/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4852/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TBA
DTSTART:20231130T061500Z
DTEND:20231130T063000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4853@conference-indico.kek.jp
DESCRIPTION:Speakers: Maki Takeuchi (Kobe University)\n\nTBA\n\nhttps://co
nference-indico.kek.jp/event/231/contributions/4853/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4853/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Analysis of entanglement entropy based on tensor renormalization g
roup
DTSTART:20231130T073000Z
DTEND:20231130T074500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4845@conference-indico.kek.jp
DESCRIPTION:Speakers: Gota Tanaka (Doshisha University)\n\nThe tensor reno
rmalization group (TRG) method was originally proposed in condensed matter
physics and has recently been drawing attention in particle physics. We i
nvestigated the shape dependence of entanglement entropy in the two-dimens
ional Ising model using the TRG method and obtained the central charge of
the theory from the scaling property of entanglement entropy. We also deve
loped a brand new method to analyze the shape dependence of entanglement e
ntropy within the TRG framework.\n\nhttps://conference-indico.kek.jp/event
/231/contributions/4845/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4845/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A new recursion relation for ABJ matrix models
DTSTART:20231129T060000Z
DTEND:20231129T061500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4798@conference-indico.kek.jp
DESCRIPTION:Speakers: Tomoki Nosaka (Kavli Institute for Theoretical Scien
ces\, University of Chinese Academy of Sciences)\n\nWe find new bilinear r
elations for the partition functions of $U (N)_k × U(N+M)_{−k}$ ABJ the
ory with two parameter mass deformation (m1\,m2)\, which generalize the q-
Toda-like equation found previously for m1=m2. By combining the bilinear r
elations with the Seiberg-like dualities and the duality cascade relations
\, we can determine the closed form expressions of the partition functions
recursively with respect to N. This method is more efficient than the exa
ct calculation by the standard TBA-like approach in the Fermi gas formalis
m. As an application we study the large N asymptotics of the partition fun
ction with the mass parameters in the supercritial regime where the large
N expansion obtained for small mass parameters is invalid.\n\nhttps://conf
erence-indico.kek.jp/event/231/contributions/4798/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4798/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Magnetic operators in 2D compact scalar field theories on the latt
ice
DTSTART:20231130T053000Z
DTEND:20231130T054500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4832@conference-indico.kek.jp
DESCRIPTION:Speakers: Soma Onoda (Kyushu University)\n\nThe admissibility
conditions are essential for obtaining a well-defined topological charge i
n lattice gauge theory. However\, these conditions may naively seem to pro
hibit the existence of magnetic operators\, as they automatically enforce
the Bianchi identity. In this presentation\, we will explain how this issu
e is addressed in the context of 2-dimensional compact scalar theories on
a lattice. Additionally\, we will explain how applications of this constru
ction\, such as 't Hooft anomalies and the Witten effect associated with e
lectric and magnetic.\n\nhttps://conference-indico.kek.jp/event/231/contri
butions/4832/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4832/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Operator dynamics in Lindbladian SYK
DTSTART:20231129T054500Z
DTEND:20231129T060000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4802@conference-indico.kek.jp
DESCRIPTION:Speakers: Pratik Nandy (YITP\, Kyoto University)\n\nUnder the
Hamiltonian evolution\, a simple operator turns into a complicated operato
r. The growth of such an operator is drastically different when the system
is connected to a dissipative environment than in a typical closed system
. We probe such growth via a recently explored measure of scrambling known
as Krylov complexity and aim to propose an operator growth hypothesis in
open quantum systems. By testing our hypothesis in a dissipative version o
f SYK model\, which is a paradigmatic model of quantum chaos and a toy mod
el of holography\, we motivate the notion of "dissipative quantum chaos".\
n\nhttps://conference-indico.kek.jp/event/231/contributions/4802/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4802/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fractional topological charge in lattice non-Abelian gauge theory
DTSTART:20231130T050000Z
DTEND:20231130T051500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4830@conference-indico.kek.jp
DESCRIPTION:Speakers: Motokazu Abe (Kyushu University)\n\nWe extend the de
finition of Lüscher's lattice topological charge to the case of 4d SU(N)
gauge fields coupled with Z_N 2-form gauge fields. This result is achieved
while maintaining the locality\, the SU(N) gauge invariance\, and Z_N 1-f
orm gauge invariance\, and we find that the manifest 1-form gauge invarian
ce plays the central role in our construction. This result gives the latti
ce regularized derivation of the mixed 't Hooft anomaly in pure SU(N) Yang
-Mills theory between its Z_N 1-form symmetry and the θ periodicity.\n\nh
ttps://conference-indico.kek.jp/event/231/contributions/4830/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4830/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A mathematical formulation of index theorem on a lattice
DTSTART:20231130T070000Z
DTEND:20231130T071500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4849@conference-indico.kek.jp
DESCRIPTION:Speakers: Hidenori Fukaya (Osaka University)\n\nWe propose a m
athematical formulation of the Atiyah-Singer index on a lattice. Employing
a one-parameter family of the massive Wilson Dirac operator\, our lattice
definition of the index does not rely on chiral symmetry or Ginsparg-Wils
on relation. We give a mathematical proof that at fine but finite lattice
spacing\, our definition converges to the index in the continuum theory. T
his talk is based on a work in collaboration with S. Aoki\, M. Furuta\, S.
Matsuo\, T. Onogi\, S. Yamaguchi and M. Yamashita.\n\nhttps://conference-
indico.kek.jp/event/231/contributions/4849/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4849/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Opening Address
DTSTART:20231129T005000Z
DTEND:20231129T010000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4805@conference-indico.kek.jp
DESCRIPTION:Speakers: Jun Nishimura (KEK\, SOKENDAI)\n\nhttps://conference
-indico.kek.jp/event/231/contributions/4805/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4805/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalization group and quantum error correction
DTSTART:20231130T061500Z
DTEND:20231130T063000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4844@conference-indico.kek.jp
DESCRIPTION:Speakers: Ryota Nasu (Shizuoka University)\n\nIt has been sugg
ested that quantum error correction plays a significant role in the AdS/CF
T correspondence. It has also been pointed out that a tensor network given
by MERA can be viewed as bulk space emerging from a boundary theory throu
gh the structure of the renormalization group. Motivated by these insights
\, we demonstrate that the renormalization group serves as an approximate
quantum error correction mechanism in scalar field theory\, by considering
scale dependence of vacuum wave functional and using coherent states.\n\n
https://conference-indico.kek.jp/event/231/contributions/4844/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4844/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TBA
DTSTART:20231130T080000Z
DTEND:20231130T081500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4854@conference-indico.kek.jp
DESCRIPTION:Speakers: Mingshuo Zhu (Tokyo Institute of Technology)\n\nTBA\
n\nhttps://conference-indico.kek.jp/event/231/contributions/4854/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4854/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-invertible symmetries in Maxwell theory on non-spin manifold
DTSTART:20231130T051500Z
DTEND:20231130T053000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4836@conference-indico.kek.jp
DESCRIPTION:Speakers: Hiroki Wada (Osaka University)\n\nWe consider non-in
vertible symmetries in Maxwell theories on a non-spin manifolds. Since lin
e operators can be either bosonic or fermionic on such manifolds\, three s
lightly different Maxwell theories without an anomaly can be formulated. W
e investigate the behaviors of these theories under gauging one-form symme
tries\, and construct non-invertible symmetries on these theories from hal
f gauging.\n\nhttps://conference-indico.kek.jp/event/231/contributions/483
6/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4836/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral theory as edge modes
DTSTART:20231129T010000Z
DTEND:20231129T020000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4804@conference-indico.kek.jp
DESCRIPTION:Speakers: Testuya Onogi (Osaka University)\n\nI give a review
(\, possibly biased\, ) on chiral theory as edge modes from a personal poi
nt of view. After reviewing the problem of chiral theory on the lattice\,
I comment on the standard method by symmetric mass generation of mirror f
ermion.I also review the recent work on chiral boson theory in 1+1 d by M.
DeMarco\, E. Lake\, X.-G. Wen.\n\nhttps://conference-indico.kek.jp/event/
231/contributions/4804/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4804/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Closing Session
DTSTART:20231201T023000Z
DTEND:20231201T024500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4851@conference-indico.kek.jp
DESCRIPTION:Speakers: Satoshi Iso (KEK)\n\nhttps://conference-indico.kek.j
p/event/231/contributions/4851/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4851/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eclectic Flavor Symmetry in Type IIB String Landscape
DTSTART:20231129T074500Z
DTEND:20231129T080000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4814@conference-indico.kek.jp
DESCRIPTION:Speakers: Takafumi Kai (Kyushu University)\n\nWe examine symme
tries of chiral four-dimensional vacua of Type IIB flux compactifications
with vanishing superpotential W=0. We find that the N=1 supersymmetric MSS
M-like and Pati-Salam vacua possess enhanced discrete symmetries in the ef
fective action below the mass scale of stabilized complex structure moduli
and dilaton. Furthermore\, a generation number of quarks/leptons is small
on these vacua where the flavor\, CP and metaplectic modular symmetries a
re described in the framework of eclectic flavor symmetry.\n\nhttps://conf
erence-indico.kek.jp/event/231/contributions/4814/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4814/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Color confinement due to topological defects ---restoration of res
idual gauge symmetries---
DTSTART:20231129T053000Z
DTEND:20231129T054500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4809@conference-indico.kek.jp
DESCRIPTION:Speakers: Naoki Fukushima (Chiba University)\n\nThe local gaug
e symmetry remaining even after imposing a gauge fixing condition is calle
d the residual local gauge symmetry\, which is spontaneously broken in the
perturbative vacuum\, and is expected to be restored in the true confinin
g vacuum. Indeed\, the criterion for restoring a special choice of the res
idual gauge symmetry was shown to be equivalent to the Kugo-Ojima color co
nfinement criterion in the Lorenz gauge. In the previous paper\, we demons
trated that such restoration can occur even in the Maximal Abelian gauge d
ue to topological defects. However\, it was later found that the topologic
al defects introduced in the previous paper give an infinite Euclidean act
ion and hence do not contribute to the path integral. In this talk\, there
fore\, we reexamine modified topological defects giving a finite Euclidean
action to contribute to the path integral. We show the restoration of the
residual local gauge symmetry in the Maximal Abelian gauge due to such a
class of topological defects.\n\nhttps://conference-indico.kek.jp/event/23
1/contributions/4809/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4809/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Photon sphere and quasinormal modes in AdS/CFT
DTSTART:20231129T050000Z
DTEND:20231129T051500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4799@conference-indico.kek.jp
DESCRIPTION:Speakers: Kakeru Sugiura (Kyoto University)\n\nPhoton spheres
are the characteristic of general black holes\, thus are a suitable touchs
tone for the emergence of gravitational spacetime in the AdS/CFT correspon
dence. We provide a spectral analysis of an AdS Schwarzschild black hole n
ear its photon sphere. We find that quasinormal modes near the photon sphe
re reflect the AdS boundary\, resulting in a peculiar spectral pattern. Ou
r large angular momentum analysis owes to an analogue to solvable Schrödi
nger equations such as an inverted harmonic oscillator and the Pöschl-Tel
ler model\, with a Dirichlet boundary condition. Through the AdS/CFT dicti
onary\, it predicts the existence of a peculiar subsector in the large ang
ular momentum spectrum of thermal holographic CFTs on a sphere. This talk
is based on arXiv:2307.00237 with Koji Hashimoto\, Katsuyuki Sugiyama\, an
d Takuya Yoda.\n\nhttps://conference-indico.kek.jp/event/231/contributions
/4799/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4799/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Page curves for 2d black holes with multiple injections
DTSTART:20231129T061500Z
DTEND:20231129T063000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4817@conference-indico.kek.jp
DESCRIPTION:Speakers: Yuuta Saito (CST\, Nihon University)\n\nWe talk abou
t Page curves for 2d black holes with multiple injections. The feature is
that a decreasing entanglement entropy related to time is replaced with a
increasing one when a energy is injected. After each energy injection\, we
find a sudden increase in the entropy\, and also subsequent increasing pe
riod. Then\, after a "Page time"\, there comes a decreasing period untill
the next energy flow is injected.\n\nhttps://conference-indico.kek.jp/even
t/231/contributions/4817/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4817/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Krylov complexity and chaos in quantum mechanics
DTSTART:20231129T051500Z
DTEND:20231129T053000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4801@conference-indico.kek.jp
DESCRIPTION:Speakers: Ryota Watanabe (Kyoto University)\n\nRecently\, Kryl
ov complexity was proposed as a measure of complexity and chaoticity of qu
antum systems. We consider the stadium billiard as a typical example of th
e quantum mechanical system obtained by quantizing a classically chaotic s
ystem\, and numerically evaluate Krylov complexity for operators and state
s. Despite no exponential growth of the Krylov complexity\, we find a clea
r correlation between variances of Lanczos coefficients and classical Lyap
unov exponents\, and also a correlation with the statistical distribution
of adjacent spacings of the quantum energy levels. This shows that the var
iances of Lanczos coefficients can be a measure of quantum chaos. The univ
ersality of the result is supported by our similar analysis of Sinai billi
ards. Our work provides a firm bridge between Krylov complexity and classi
cal/quantum chaos.\n\nhttps://conference-indico.kek.jp/event/231/contribut
ions/4801/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4801/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exact WKB Analysis and TBA Equations for the Stark Effect
DTSTART:20231130T074500Z
DTEND:20231130T080000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4803@conference-indico.kek.jp
DESCRIPTION:Speakers: Jingjing Yang (Tokyo Institute of Technology)\n\nIn
this talk\, I will discuss the application of the exact WKB analysis to a
couple of one-dimensional Schrödinger-type equations reduced from the Sta
rk effect of hydrogen. By introducing Langer’s modification\, we prove t
he exactness of the Bohr-Sommerfeld quantization conditions for the Borel-
resummed quantum WKB periods at the weak electric field intensities and al
so find these quantization conditions get modified with an additional supp
ressed contribution when the electric field becomes large. We also present
TBA equations governing the quantum periods in the absence of Langer’s
modification. I will mention its possible application to supersymmetric ga
uge theory and quasi-normal modes around black holes in the end.\n\nhttps:
//conference-indico.kek.jp/event/231/contributions/4803/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4803/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hartle-Hawking v.s. Vilenkin saddle points in quantum cosmology by
the generalized Lefschetz thimble method
DTSTART:20231129T050000Z
DTEND:20231129T051500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4807@conference-indico.kek.jp
DESCRIPTION:Speakers: CHOU CHIEN-YU (SOKENDAI)\n\nQuantum cosmology invest
igates the origins of our Universe\, including the concept of "tunneling f
rom nothing" proposed by Vilenkin and Hartle-Hawking. Recent advancements
have renewed interest in this field\, employing the Picard-Lefschetz theor
y in Lorentzian quantum gravity. In this study\, we address crucial challe
nges using the generalized Lefschetz thimble method\, overcoming the sign
problem in Monte Carlo techniques. By the mini-superspace model\, we perfo
rm first-principle calculations to shed light on fundamental issues. We ta
ckle concerns regarding the integration domain of the lapse function and e
xplore the Robin boundary condition at the initial time\, incorporating as
pects of Dirichlet and Neumann boundary conditions. Our findings reveal th
e Stokes phenomenon\, where the dominant saddle point transitions from Vil
enkin to Hartle-Hawking\, aligning with expectations from the Picard-Lefsc
hetz theory. Notably\, we focus on the intricate simulation of the Hartle-
Hawking proposal for a minute final size of the universe\, which is highly
nontrivial.\n\nhttps://conference-indico.kek.jp/event/231/contributions/4
807/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4807/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The effect of fermions on the emergence of (3 +1)-dimensional expa
nding space-time in the Lorentzian type IIB matrix model
DTSTART:20231129T051500Z
DTEND:20231129T053000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4808@conference-indico.kek.jp
DESCRIPTION:Speakers: Kohta Hatakeyama (Hirosaki University)\n\nThe Lorent
zian type IIB matrix model is a promising candidate for a non-perturbative
formulation of superstring theory. Recently\, we have performed complex L
angevin simulations adding a Lorentz invariant mass term as an IR regulato
r. In this talk\, we will show that the (3+1)-dimensional expanding space-
time emerges due to the effect of fermions.\n\nhttps://conference-indico.k
ek.jp/event/231/contributions/4808/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4808/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Semiclassical analysis of the bifundamental QCD with anom aly-pres
erving $T^2$ compactification
DTSTART:20231129T054500Z
DTEND:20231129T060000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4810@conference-indico.kek.jp
DESCRIPTION:Speakers: Yui Hayashi (YITP\, Kyoto University)\n\nBifundament
al QCD\, an $SU(N) \\times SU(N)$ gauge theory with a bifundamental fermio
n\, has received substantial attention due to its rich phase structure and
its notable relevance to the large-$N$ orbifold equivalence. To investiga
te the vacuum structure and phase diagrams of this model\, we employ a sem
iclassical center-vortex description of the confining vacuum\, enabled thr
ough anomaly-preserving $T^2$ compactification under the assumption of adi
abatic continuity. In this presentation\, we will show how our semiclassic
al framework explains one of the conjectured phase diagrams previously pro
posed in literature. Specifically\, our results provide positive support f
or the nonperturbative validity of the large-$N$ orbifold equivalence betw
een bifundamental QCD and $\\mathcal{N}=1$ $SU(2N)$ supersymmetric Yang-Mi
lls theory.\n\nhttps://conference-indico.kek.jp/event/231/contributions/48
10/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4810/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A new perspective on thermal transition in QCD
DTSTART:20231129T060000Z
DTEND:20231129T061500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4811@conference-indico.kek.jp
DESCRIPTION:Speakers: Hiromasa Watanabe (YITP\, Kyoto University)\n\nMotiv
ated by the picture of partial deconfinement developed in recent years for
large-N gauge theories\, we propose a new way of analyzing and understand
ing thermal phase transition in QCD. We find nontrivial support for our pr
oposal by analyzing the lattice configuration for 4d SU(3) QCD with dynami
cal quarks\, produced by WHOT-QCD collaboration. In the discussion\, the P
olyakov line plays a crucial role in characterizing the phases at large N
and finite N\, without relying on center symmetry. Confinement at low temp
eratures is characterized by the Haar-random distribution of the Polyakov
line phases. Haar-randomness\, which is stronger than unbroken center symm
etry\, indicates that Polyakov loops in any nontrivial representations hav
e vanishing expectation values and deviation from the Haar-random distribu
tion at higher temperatures is quantified with the loops. We discuss that
the transitions separating the partially-deconfined phase are characterize
d by the behaviors of Polyakov loops in various representations. As a nont
rivial test for our proposal\, we also investigate the relation between pa
rtial deconfinement and instanton condensation and confirm the consistency
with the lattice data. This work is based on our recent works arXiv:2310.
01940 and arXiv:2310.07533.\n\nhttps://conference-indico.kek.jp/event/231/
contributions/4811/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4811/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research on QFT beyond the high-symmetry regime -resurgence\, latt
ice and graph-
DTSTART:20231129T023000Z
DTEND:20231129T033000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4806@conference-indico.kek.jp
DESCRIPTION:Speakers: Tatsuhiro Misumi (Kindai University)\n\nSince the es
tablishment of the Standard Model of elementary particles\, the research i
n quantum field theory has investigated non-perturbative analysis based on
theories with high symmetry\, such as supersymmetry. However\, the Standa
rd Model\, including QCD\, has relatively low symmetry\, and it is getting
important to analyze theories based on features appearing only in QFT wit
h low symmetry. In this talk\, I will introduce resurgence theory and grap
h-based lattice field theory as directions for non-perturbative understand
ing of QFT that does not rely on symmetry\, and will provide a guideline f
or future research on QFT.\n\nhttps://conference-indico.kek.jp/event/231/c
ontributions/4806/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4806/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On Holography in de Sitter Space
DTSTART:20231130T000000Z
DTEND:20231130T010000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4825@conference-indico.kek.jp
DESCRIPTION:Speakers: Tadashi Takayanagi (YITP\, Kyoto University)\n\nIn t
his talk\, we will discuss possible holographic dual of de Sitter Space fr
om two different ideas. One is the original dS/CFT correspondence\, and we
will present an explicit CFT dual for three dimensional de Sitter space a
nd examine its properties. The other is to study a holographic dual of a h
alf de Sitter space\, which has a time- like boundary. After we explain th
e results based on these approaches\, we will discuss their implications.\
n\nhttps://conference-indico.kek.jp/event/231/contributions/4825/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4825/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Three ways of calculating comp osite-particle spectra of gauge the
ories in the Hamiltonian formalism
DTSTART:20231129T061500Z
DTEND:20231129T063000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4812@conference-indico.kek.jp
DESCRIPTION:Speakers: Akira Matsumoto (YITP\, Kyoto University)\n\nWe prop
ose three distinct methods to compute the mass of composite particles (had
rons) of gauge theories in the Hamiltonian formalism. Determination of the
mass spectrum of hadrons is one of the key issues in QCD\, which has been
precisely calculated by the Monte Carlo simulation based on the Lagrangia
n formalism. We newly show how to compute the mass spectra in the Hamilton
ian formalism\, which is suitable for quantum computation and tensor netwo
rk methods. The three methods\, by examining the correlation function\, th
e one-point function\, and the dispersion relation\, are demonstrated usin
g the density-matrix renormalization group (DMRG) in the 2-flavor Schwinge
r model\, which shares important properties with QCD. We show that their r
esults are consistent with each other\, and discuss their potential applic
ations. (preprint: https://arxiv.org/abs/2307.16655)\n\nhttps://conference
-indico.kek.jp/event/231/contributions/4812/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4812/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giant graviton expansions for N=2 superconformal field theories
DTSTART:20231129T073000Z
DTEND:20231129T074500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4813@conference-indico.kek.jp
DESCRIPTION:Speakers: Shuichi Murayama (Tokyo Institute of Technology)\n\n
The giant graviton expansion of the superconformal index gives the finite
rank corrections to the calculation of the index of the superconformal fie
ld theory via AdS/CFT correspondence. We study the giant graviton expansio
ns focusing on the 4-dimensional N=2 superconformal field theories realize
d on D3-branes in 7-brane backgrounds with constant axiodilaton. For some
theories including them\, the expansion can be reduced to a simple sum ove
r the wrapping numbers of the giant gravitons. This talk is based on arXiv
:2310.03332 in collaboration with S. Fujiwara\, Y. Imamura\, T. Mori\, and
D. Yokoyama.\n\nhttps://conference-indico.kek.jp/event/231/contributions/
4813/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4813/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Relation between covariant and light-cone superstring field theory
DTSTART:20231129T070000Z
DTEND:20231129T071500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4815@conference-indico.kek.jp
DESCRIPTION:Speakers: Yuji Ando (University of Tsukuba)\n\nIn perturbative
string theory\, there have mainly been two ways to quantize the string. E
ither one quantizes in lightcone gauge\, or one quantizes covariantly. The
difference between them is only gauge condition\, and the equivalence of
on-shell amplitudes had been already shown. String field theory is a candi
date for a non-perturbative formulation of string theory. There have mainl
y been two formulations\, they are covariant string field theory (covarian
t SFT) and light-cone string field theory (light-cone bosonic SFT) In boso
nic string field theory\, it is shown that the light-cone bosonic SFT is a
n effective SFT which is obtained by integrating out some degrees of freed
om from a covariant bosonic SFT by Erler-Matsunaga. We show that the light
-cone super SFT is an effective SFT for a covariant super SFT. This talk i
s based on the collaboration with R.Fujii\, H.Kunitomo and J.Yoshinaka.\n\
nhttps://conference-indico.kek.jp/event/231/contributions/4815/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4815/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Derivation of 11 dimensional spacetime without assuming supersymme
try
DTSTART:20231129T081500Z
DTEND:20231129T083000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4816@conference-indico.kek.jp
DESCRIPTION:Speakers: Takeshi Morita (Shizuoka University)\n\nIn this talk
\, I demonstrate that scale invariance and electromagnetic duality are str
ong enough to restrict the spacetime dimension. 10 and 11 dimensional spac
etimes are obtained as solutions of these constraints. In this derivation\
, supersymmetry and general relativity are not assumed.\n\nhttps://confere
nce-indico.kek.jp/event/231/contributions/4816/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4816/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The phase diagram of the bosonic Lorentzian IKKT matrix model with
the mass term
DTSTART:20231129T070000Z
DTEND:20231129T071500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4819@conference-indico.kek.jp
DESCRIPTION:Speakers: Worapat Piensuk (SOKENDAI)\n\nThe IKKT matrix model
was proposed in 1996 as a non-perturbative description of superstring theo
ry. One of its appealing features is the fact that spacetime emerges natur
ally from first principles as the eigenvalue distribution of the bosonic m
atrix degrees of freedom. For the past few decades\, there has been extens
ive number of numerical attempts to study the model. In this work\, we inv
estigate the bosonic Lorentzian IKKT model with the addition of the mass t
erm to regularize the path integral. We first exhaust all the classical so
lutions at N=2 and find that there are non-trivial solutions representing
lower-dimensional spacetimes. By performing the perturbative expansions an
d computing the partition functions associated with the solutions\, we can
obtain a phase diagram of the theory. We also discuss the possibility of
the emergence of the real spacetime.\n\nhttps://conference-indico.kek.jp/e
vent/231/contributions/4819/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4819/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The analysis of the Lorentzian IKKT matrix model at large D
DTSTART:20231129T071500Z
DTEND:20231129T073000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4820@conference-indico.kek.jp
DESCRIPTION:Speakers: Naoyuki Yamamori (SOKENDAI)\n\nThe IKKT matrix model
is the most promising candidate of a non-perturbative formulation of supe
rstring theory. Recently it has been proposed to introduce the Lorentz inv
ariant mass term as a regularization. This model has SO(9\,1) Lorentz symm
etry\, and a partition function diverges due to the non-compactness of the
volume of the Lorentz group. In this study\, we have done the analytical
calculation at large D. In the case with N=2\, there are three classical s
olutions in total. We clarified the physical meaning of the solutions and
a phase diagram of the theory by doing a 1/D expansion around each solutio
n.\n\nhttps://conference-indico.kek.jp/event/231/contributions/4820/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4820/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lefschetz-thimbl e analysis of the Lorentzian IKKT matrix model ar
ound saddle point configurations
DTSTART:20231129T073000Z
DTEND:20231129T074500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4821@conference-indico.kek.jp
DESCRIPTION:Speakers: Ashutosh Tripathi (KEK)\n\nThe type IIB matrix model
is a promising candidate for a nonperturbative definition of superstring
theory. The Lorentzian version\, however\, is not well defined as it is\,
and it was recently proposed to introduce a Lorentz invariant mass term in
the action as an IR regulator. Depending on the sign of this term\, we ei
ther have a model that is truly Lorentzian or one that is comparable to th
e Euclidean model. In this work we numerically investigate the purely Lore
ntzian case using Lefschetz thimble method. Our investigation of the simpl
est N = 2 bosonic case confirms certain surprising properties of the model
predicted from the analytical calculations like divergence of the partiti
on function\, phase transition etc. We claim that these features are truly
Lorentzian in nature. We also discuss the impact of this statement in the
possible emergence of (3+1)D expanding space-time.\n\nhttps://conference-
indico.kek.jp/event/231/contributions/4821/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4821/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Problems and Prospects of Quantum Gravity and String Theory
DTSTART:20231201T013000Z
DTEND:20231201T023000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4828@conference-indico.kek.jp
DESCRIPTION:Speakers: Hikaru Kawai (National Taiwan University)\n\nCurrent
problems in quantum gravity and string theory will be summarized and how
they may be overcome in the future will be discussed.\n\nhttps://conferenc
e-indico.kek.jp/event/231/contributions/4828/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4828/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Perturbative superstring theory and the IKKT matrix model
DTSTART:20231129T074500Z
DTEND:20231129T080000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4822@conference-indico.kek.jp
DESCRIPTION:Speakers: Yuhma Asano (University of Tsukuba)\n\nIn this talk\
, we revisit the "derivation" of the IKKT matrix model from perturbative s
tring theory and discuss how we should define the path integral of the mat
rix model. In course of the "derivation\," we will see that kappa symmetry
is formally enhanced and that there is a subalgebra of the gauge symmetry
closed off-shell\, in sharp contrast to the fact that the kappa symmetry
in the Nambu-Goto/Polyakov-type Green-Schwarz formalism is closed only on-
shell. This allows us to utilise the BRST quantisation for the perturbativ
e superstring and provides a construction of vertex operators in the matri
x model.\n\nhttps://conference-indico.kek.jp/event/231/contributions/4822/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4822/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ground state degeneracy and module category
DTSTART:20231129T080000Z
DTEND:20231129T081500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4823@conference-indico.kek.jp
DESCRIPTION:Speakers: Ken Kikuchi (National Taiwan University)\n\nOne of t
he goals in quantum field theory is to identify long distance behaviors of
a theory defined at a short distance. One criterion to distinguish long d
istance behaviors is the precense of gap. When it is gapped\, in two-dimen
sional space(time)\, the phases stand in bijection with module categories.
In particular\, ground state degeneracies (GSDs) of gapped phases are giv
en by ranks of module categories. In this talk\, we present a method to cl
assify module categories. The results constrain (or fix) GSDs in gapped ph
ases. Sometimes\, it also implies symmetries in the problem should be spon
taneously broken.\n\nhttps://conference-indico.kek.jp/event/231/contributi
ons/4823/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4823/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Correlation functions from homotopy algebras and the applications
DTSTART:20231129T081500Z
DTEND:20231129T083000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4824@conference-indico.kek.jp
DESCRIPTION:Speakers: Keisuke Konosu (The University of Tokyo)\n\nHomotopy
algebras algebras have been contributed to describe string field theory e
ffectively. Recently\, it has been recognized that these algebras can also
be used to express quantum field theory\, and its formulas are believed t
o be universal. In the recent research\, it is presented that correlation
functions of scalar field theories can be written in terms of homotopy alg
ebras. In this talk\, we present that the same formula can be used to desc
ribe correlation functions for both scalar fields and Dirac fields based o
n the work arXiv:2305.11634 with Yuji Okawa and arXiv:2305.13103. We also
present some applications of our formulas.\n\nhttps://conference-indico.ke
k.jp/event/231/contributions/4824/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4824/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gradient flow exact renormalization group: Illustration in the gau
ged NJL model
DTSTART:20231201T000000Z
DTEND:20231201T010000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4827@conference-indico.kek.jp
DESCRIPTION:Speakers: Hiroshi Suzuki (Kyushu University)\n\nWilson's exact
renormalization group (ERG) is a fundamental idea for defining quantum fi
eld theory at a non-perturbative level. The conventional ERG based on the
momentum cutoff\, however\, cannot preserve the manifest gauge invariance
and this fact hinders non-perturbative analyses of gauge theories using ER
G. In this talk\, I explain the gradient flow exact renormalization group
(GFERG)\, which we have recently proposed and developed as an ERG that pre
serves the manifest gauge invariance. Here\, in particular\, we apply the
GFERG to the U(1) gauged Nambu–Jona-Lasinio model and illustrate the adv
antage the GFERG offers compared to the conventional ERG.\n\nhttps://confe
rence-indico.kek.jp/event/231/contributions/4827/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4827/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice study of RG fixed point based on gradient flow in 3D O(N)
sigma model
DTSTART:20231130T051500Z
DTEND:20231130T053000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4831@conference-indico.kek.jp
DESCRIPTION:Speakers: Okuto Morikawa (Osaka University)\n\nWe present the
lattice simulation of the renormalization group flow in the 3-dimensional
O(N) linear sigma model. This model possesses a nontrivial infrared fixed
point\, called Wilson-Fisher fixed point. Arguing that the parameter space
of running coupling constants can be spanned by expectation values of ope
rators evolved by the gradient flow\, we exemplify a scaling behavior anal
ysis based on the gradient flow in the large N approximation at criticalit
y. Then\, we work out the numerical simulation of the theory with finite N
. Depicting the renormalization group flow along the gradient flow\, we co
nfirm the existence of the Wilson-Fisher fixed point non-perturbatively.\n
\nhttps://conference-indico.kek.jp/event/231/contributions/4831/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4831/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the classification of 6d supergravities
DTSTART:20231130T070000Z
DTEND:20231130T071500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4840@conference-indico.kek.jp
DESCRIPTION:Speakers: Gregory Loges (KEK)\n\nRequiring the absence of gaug
e and gravitational anomalies places very strong constraints on six-dimens
ional chiral theories. For 6d supergravity with minimal supersymmetry ther
e is a natural way to identify consistent theories with cliques in a certa
in multigraph which encodes the pair-wise compatibility of simple\, irredu
cible theories. Leveraging ideas from graph theory\, I will discuss the cl
assification of these theories for any number of tensor multiplets and lar
gely unconstrained semi-simple gauge group and hypermultiplet representati
ons.\n\nhttps://conference-indico.kek.jp/event/231/contributions/4840/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4840/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Curved domain-wall fermion and its applications
DTSTART:20231130T054500Z
DTEND:20231130T060000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4833@conference-indico.kek.jp
DESCRIPTION:Speakers: Naoto Kan (Osaka University)\n\nThe Witten effect pr
edicts that a magnetic monopole acquires a fractional electric charge insi
de topological insulators. In this work\, we give a microscopic descriptio
n of this phenomenon as well as an analogous two-dimensional system with a
vortex. We solve the Dirac equation of electron field both analytically i
n a continuum and numerically on a lattice by adding the Wilson term and s
mearing the gauge field within a finite range to regularize the short-dist
ance behavior of the system. Our results reveal that the Wilson term induc
es a strong positive mass shift\, creating a domain-wall around the monopo
le or vortex. This small yet finite-sized domain wall localizes the chiral
zero modes and ensures their stability through the Atiyah-Singer index th
eorem\, whose cobordism invariance is crucial in explaining why the electr
ic charge is fractional.\n\nhttps://conference-indico.kek.jp/event/231/con
tributions/4833/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4833/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phases in the fundamental Kazakov-Migdal model on the graph
DTSTART:20231130T060000Z
DTEND:20231130T061500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4834@conference-indico.kek.jp
DESCRIPTION:Speakers: Kazutoshi Ohta (Meiji Gakuin University)\n\nWe discu
ss the phase structure of the fundamental Kazakov-Migdal (FKM) model\, whi
ch is defined on graphs and a generalization of the Kazakov-Migdal model b
y replacing the scalar fields in the adjoint representation with the funda
mental representation. We first show that the partition function of the FK
M model can be represented by the unitary matrix valued graph zeta functio
ns\, which systematically counts possible Wilson loops on the graph. The e
ffective action of the FKM model reduces to the Wilson action and is expec
ted to induced Yang-Mills theory thanks to lack of the extra local symmetr
y. We evaluate the partition function of the FKM model exactly in the larg
e N limit. In the different regions of the coupling constant corresponding
to the confinement/deconfinement phase\, the partition function is evalua
ted by using the factorizing property and saddle point method. In some cas
es depending on the graph structure\, the derivative of the specific heat
is jumped at the critical coupling constant. So we can expect that there i
s third order phase transition in the FKM model as well as the Gross-Witte
n-Wadia phase transition. We also perform the numerical analysis by using
the HMC and check the above phase structure of the FKM model on various gr
aphs.\n\nhttps://conference-indico.kek.jp/event/231/contributions/4834/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4834/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-invertible duality defect and non-commut ative fusion algebra
DTSTART:20231130T050000Z
DTEND:20231130T051500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4835@conference-indico.kek.jp
DESCRIPTION:Speakers: Soichiro Shimamori (Osaka University)\n\nWe study no
n-invertible duality symmetries by gauging a diagonal subgroup of a non-an
omalous U(1) × U(1) global symmetry. In particular\, we employ the half-s
pace gauging to c=2 bosonic torus conformal field theory (CFT) in two dime
nsions and pure U(1) × U(1) gauge theory in four dimensions. In c=2 boson
ic torus CFT\, we show that the non-invertible symmetry obtained from the
diagonal gauging becomes emergent on an irrational CFT point. We also calc
ulate the fusion rules concerning the duality defect. We find out that the
fusion algebra is non-commutative. We also obtain a similar result in pur
e U(1) × U(1) gauge theory in four dimensions. This presentation is based
on the joint work with Yuta Nagoya [arXiv: 2309.05294\, hep-th] .\n\nhttp
s://conference-indico.kek.jp/event/231/contributions/4835/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4835/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalized chiral instabilities\, linking numbers\, and non-inver
tible symmetries
DTSTART:20231130T053000Z
DTEND:20231130T054500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4837@conference-indico.kek.jp
DESCRIPTION:Speakers: Ryo Yokokura (Keio University)\n\nWe demonstrate a u
niversal mechanism of a class of instabilities in infrared regions for mas
sless Abelian p-form gauge theories with topological interactions\, which
we call generalized chiral instabilities. Such instabilities occur in the
presence of initial electric fields for the p-form gauge fields. We show t
hat the dynamically generated magnetic fields tend to decrease the initial
electric fields and result in configurations with linking numbers\, which
can be characterized by non-invertible global symmetries. The so-called c
hiral plasma instability and instabilities of the axion electrodynamics an
d (4+1)-dimensional Maxwell-Chern-Simons theory in electric fields can be
described by the generalized chiral instabilities in a unified manner. We
also illustrate this mechanism in the (2+1)-dimensional Goldstone-Maxwell
model in electric field.\n\nhttps://conference-indico.kek.jp/event/231/con
tributions/4837/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4837/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Volume complexity of dS bubbles
DTSTART:20231130T074500Z
DTEND:20231130T080000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4843@conference-indico.kek.jp
DESCRIPTION:Speakers: Nicolo Zenoni (Osaka University)\n\nHolographic comp
lexity is conjectured to probe the evolution of spacetime. For black holes
in anti-de Sitter (AdS) spacetime the growth rate of complexity approache
s a constant value at late times\, while in de Sitter (dS) spacetime it di
verges at a finite critical time. In this talk\, we consider geometries in
terpolating between AdS and dS. In particular\, we discuss the evolution o
f volume complexity in a class of three-dimensional asymptotically anti-de
Sitter geometries including dynamical bubbles of de Sitter in their inter
ior. According to the dynamics of the bubble\, complexity qualitatively be
haves either as in the AdS black hole or as in the dS case. We conclude wi
th some remarks about the possible dual interpretation.\n\nhttps://confere
nce-indico.kek.jp/event/231/contributions/4843/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4843/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gradient Flow Exact Renormalisation Group for Scalar Quantum Elect
rodynamics
DTSTART:20231129T053000Z
DTEND:20231129T054500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4848@conference-indico.kek.jp
DESCRIPTION:Speakers: Junichi Haruna (Osaka University)\n\nWe apply the gr
adient flow exact renormalisation group (GFERG) for scalar quantum electro
dynamics. The flow equations for the Wilsonian effective action is derived
by means of perturbative expansion in the gauge coupling. In this work\,
we deal with quantum corrections to the correlation functions up to second
order of the gauge coupling. We demonstrate especially that the GFERG for
malism actually respects the gauge invariance in sense that the anomalous
dimension of the gauge field agrees with the standard perturbative computa
tion and the mass of the photon keeps vanishing in general spacetime dimen
sions. The latter is a noteworthy fact which contrasts with the convention
al exact renormalisation group formalism in which an artificial photon mas
s proportional to a cutoff scale is induced. These results may therefore i
mply the ability of the GFERG formalism as a gauge-invariant renormalisati
on group flow.\n\nhttps://conference-indico.kek.jp/event/231/contributions
/4848/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4848/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The effective potential for string backgrounds from string geometr
y theory
DTSTART:20231130T060000Z
DTEND:20231130T061500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4839@conference-indico.kek.jp
DESCRIPTION:Speakers: Matsuo Sato (Hirosaki University)\n\nString geometry
theory is one of the candidates of the non-perturbative formulation of st
ring theory. In this theory\, strings constitute not only particles but al
so the space-time. In this talk\, in string geometry theory\, we identify
perturbative vacua in string theory\, which include general string backgro
unds. From fluctuations around these vacua\, we derive the path-integrals
of perturbative strings on the string backgrounds up to any order. Further
more\, the identification of the perturbative vacua enables us to obtain d
ifferential equations that determine an effective potential for string bac
kgrounds. We solve the differential equations and obtain an effective pote
ntial explicitly up to the second order. In a generic region\, we show tha
t the minimum of the second order potential gives a non-trivial background
. This fact supports that the full effective potential can determine the t
rue vacuum in string theory. The urgent problem is to find the global mini
mum and we introduce both analytical and numerical methods.\n\nhttps://con
ference-indico.kek.jp/event/231/contributions/4839/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4839/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black hole/string transition in the black hole evaporation
DTSTART:20231130T071500Z
DTEND:20231130T073000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4841@conference-indico.kek.jp
DESCRIPTION:Speakers: Yoshinori Matsuo (Kindai University)\n\nIn this talk
\, we discuss the black hole/string transition in the black hole evaporati
on. Susskind proposed that a black hole turns into a highly excited string
as one adiabatically decreases the string coupling. Horowitz and Polchins
ki constructed a model of string bound state which describes the string ph
ase of the black hole/string transition. In the previous work\, we extende
d the Horowitz-Polchinski model by taking the non-linear effect of gravity
and found that the black hole phase can also be desribed by the bound sta
te of strings. At low temperatures\, the string bound state approximately
behaves as a black hole\, but the geometry has no event horizon. In this s
tudy\, we take the effect of the Hawking radiation and introduce the time
evolution of the black hole. Our model describes the evaporation of black
holes including the transition to strings in the final stages.\n\nhttps://
conference-indico.kek.jp/event/231/contributions/4841/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4841/
END:VEVENT
BEGIN:VEVENT
SUMMARY:UV Dispersive Effects on Hawking Radiation
DTSTART:20231130T073000Z
DTEND:20231130T074500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4842@conference-indico.kek.jp
DESCRIPTION:Speakers: Cheng-Tsung Wang (National Taiwan University)\n\nWe
revisit the connection between Hawking radiation and high-frequency disper
sions for a Schwarzschild black hole following the work of Brout et al.. A
fter confirming the robustness of Hawking radiation for monotonic dispersi
on relations\, we consider non-monotonic dispersion relations that deviate
from the standard relation only in the trans-Planckian domain. Contrary t
o the common belief that Hawking radiation is insensitive to UV physics\,
it turns out that Hawking radiation is subject to significant modification
s after the scrambling time. Depending on the UV physics at the singularit
y\, the amplitude of Hawking radiation could diminish after the scrambling
time\, while the Hawking temperature remains the same. Our finding is thu
s not contradictory to earlier works regarding the robustness of Hawking t
emperature.\n\nhttps://conference-indico.kek.jp/event/231/contributions/48
42/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4842/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Grassmann tensor network study of multi-flavor gauge theory
DTSTART:20231130T071500Z
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UID:indico-contribution-4846@conference-indico.kek.jp
DESCRIPTION:Speakers: Atis Yosprakob (Niigata University)\n\nDealing with
multiple flavors of Wilson fermions with Grassmann TRG is known to be diff
icult due to the exponential growth of the tensor size. Here\, we propose
a way to overcome this problem by separating the initial tensor into layer
s\, each corresponding to different flavor. A compression scheme for the i
nitial tensor is also proposed to further reduce the size. We test our met
hod by studying the chiral phase transition. We also demonstrate the Silve
r Blaze phenomenon in Abelian gauge theory with up to 4 flavors\, which is
impossible with the Monte Carlo method due to the severe sign problem.\n\
nhttps://conference-indico.kek.jp/event/231/contributions/4846/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4846/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Semi-classical Spacetime Region with Maximum Entropy
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UID:indico-contribution-4800@conference-indico.kek.jp
DESCRIPTION:Speakers: Yuki Yokokura (RIKEN iTHEMS)\n\nWe consider a 4D sph
erically-symmetric static spacetime region as a collection of quanta in th
e semi-classical Einstein equation and study the entropy including the sel
f-gravity. For sufficiently excited states\, we estimate the entropy in a
WKB-like method considering the non-locality of entropy and local consiste
ncy with thermodynamics and find its upper bound. The saturation condition
uniquely determines the entropy-maximized spacetime as a dense configurat
ion with near-Planckian curvatures and a surface just outside the Schwarzs
child radius\, and the metric is a non-perturbative solution for Planck co
nstant\, leading to the species bound. The maximum entropy then saturates
the Bousso bound and coincides with the Bekenstein-Hawking formula. Thus\,
the Bousso bound in this class of spacetime is verified by constructing t
he saturating configuration that has no horizon and stores information ins
ide. [arXiv: 2309.00602 (ver2)]\n\nhttps://conference-indico.kek.jp/event/
231/contributions/4800/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4800/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Automatic hermiticity for mixed states
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DTSTAMP:20240908T062100Z
UID:indico-contribution-4818@conference-indico.kek.jp
DESCRIPTION:Speakers: Keiichi Nagao (Ibaraki University)\n\nWe previously
proposed a mechanism to effectively obtain\, after a long time development
\, a Hamiltonian being Hermitian with regard to a modified inner product $
I_Q$ that makes a given non-normal Hamiltonian normal by using an appropri
ately chosen Hermitian operator $Q$. We studied it for pure states. In thi
s talk we show that a similar mechanism also works for mixed states by int
roducing density matrices to describe them and investigating their propert
ies explicitly. In particular\, in the future-included theories\, where no
t only a past state at the initial time $T_A$ but also a future state at t
he final time $T_B$ is given\, we introduce a “skew density matrix” co
mposed of both ensembles of the future and past states such that the trace
of the product of it and an operator $O$ matches a normalized matrix elem
ent of $O$. We argue that the skew density matrix defined with $I_Q$ at
the present time t for large $T_B − t$ and large $t − T_A$ approximat
ely corresponds to another density matrix composed of only an ensemble of
past states and defined with another inner product $I_{Q_J}$ for large $t
− T_A$. This talk is based on the collaboration with Holger Bech Nielsen
[Prog. Theor. Exp. Phys. 2023 (3) 031B01] (arXiv:arXiv:2209.11619 [hep-th
]).\n\nhttps://conference-indico.kek.jp/event/231/contributions/4818/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4818/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A recipe for a bulk construction from a scalar CFT by a conformal
flow
DTSTART:20231130T054500Z
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UID:indico-contribution-4847@conference-indico.kek.jp
DESCRIPTION:Speakers: Sinya Aoki (YITP\, Kyoto University)\n\nWe summarize
our recent attempt to construct a bulk spacetime from a scalar CFT such a
s an O(N) vector model by a conformal flow\, which generates bulk fields f
rom boundary scalar fields by smearing them. In this approach\, bulk corre
lation functions are completely determined by the boundary theory\, while
bulk geometry is unspecified. We propose a method to determine the bulk ge
ometry depending on a bulk state we consider\, by employing the Bures info
rmation metric adopted for a specific state. We finally comment on necessi
ties of both holography and large N limit for a geometric description of C
FT.\n\nhttps://conference-indico.kek.jp/event/231/contributions/4847/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4847/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exploring the Landscape of 6d supergravity
DTSTART:20231130T023000Z
DTEND:20231130T033000Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4829@conference-indico.kek.jp
DESCRIPTION:Speakers: Yuta Hamada (KEK)\n\nExploring the Landscape of 6d s
upergravity\n\nhttps://conference-indico.kek.jp/event/231/contributions/48
29/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4829/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sequestered String Models imply Split Supersymmetry
DTSTART:20231130T080000Z
DTEND:20231130T081500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4838@conference-indico.kek.jp
DESCRIPTION:Speakers: Hajime Otsuka (Kyushu University)\n\nSequestering is
a promising mechanism in 4D string models to reconcile high scale inflati
on with low-energy supersymmetry. In this scenario the MSSM lives on brane
s at singularities and it is sequestered from the sources of supersymmetry
breaking in the bulk. The soft-terms are suppressed with respect to the g
ravitino mass so that all moduli are heavy enough to avoid any cosmologica
l moduli problem. In this talk\, we focus on stability bounds and flavour
constraints on sequestered string models\, finding that they can be satisf
ied if the soft-terms give rise to a mass spectrum typical of split supers
ymmetry with TeV-scale gauginos and sfermions around 10^7 GeV. When instea
d scalar and gaugino masses are of the same order of magnitude\, large fla
vour changing neutral currents can be avoided only by pushing the soft-ter
ms above 10^6 GeV. However this scenario is in tension with stability boun
ds due to the presence of charge and colour breaking vacua which could be
populated in the early universe\, and the possible emergence of directions
along which the potential is unbounded from below. Reference: 2309.05752
[hep-th]\n\nhttps://conference-indico.kek.jp/event/231/contributions/4838/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4838/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Petz (lite) recovery map for scrambling channel
DTSTART:20231130T011500Z
DTEND:20231130T021500Z
DTSTAMP:20240908T062100Z
UID:indico-contribution-4826@conference-indico.kek.jp
DESCRIPTION:Speakers: Tomonori Ugajin (Rikkyo University)\n\nWe study the
properties of the Petz recovery map in chaotic systems\, such as the Hayde
n-Preskill setup for evaporating black holes and the SYK model. Since thes
e systems exhibit the phenomenon called scrambling\, we expect that the ex
pression of the recovery channel $\\mathcal{R}$ gets simplified\, given by
just the adjoint $\\mathcal{N}^{\\dagger}$ of the original channel $\\mat
hcal{N}$ which defines the time evolution of the states in the code subspa
ce embedded into the physical Hilbert space. We check this phenomenon in t
wo examples. The first one is the Hayden-Preskill setup described by Haar
random unitaries. We compute the relative entropy $S(\\mathcal{R}\\left[\\
mathcal{N}[\\rho]\\right] ||\\rho)$ and show that it vanishes when the dec
oupling is archived. We further show that the simplified recovery map is e
quivalent to the protocol proposed by Yoshida and Kitaev. The second examp
le is the SYK model where the two dimensional code subspace is defined by
an insertion of a fermionic operator\, and the system is evolved by the SY
K Hamiltonian. We check the recovery phenomenon by relating some matrix el
ements of an output density matrix $\\langle T|\\mathcal{R}[\\mathcal{ N}[
\\rho]] | T' \\rangle$ to R\\'enyi-two modular flowed correlators\, and sh
ow that they coincide with the elements for the input density matrix with
small error after twice the scrambling time.\n\nhttps://conference-indico.
kek.jp/event/231/contributions/4826/
LOCATION:KEK Tsukuba Campus
URL:https://conference-indico.kek.jp/event/231/contributions/4826/
END:VEVENT
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