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BEGIN:VEVENT
SUMMARY:Unstable Nambu-Goldstone modes
DTSTART:20221207T054000Z
DTEND:20221207T060000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3819@conference-indico.kek.jp
DESCRIPTION:Speakers: Ryo Yokokura (KEK)\n\nNambu-Goldstone (NG) modes for
0-form and higher-form symmetries can become unstable in the presence of
background fields. The examples include the instability of a photon with a
time-dependent axion background or with a chirality imbalance\, known as
the chiral plasma instability\, and the instability of a dynamical axion w
ith a background electric field. We show that all these phenomena can be u
niversally described by a symmetry algebra for 0-form and higher-form symm
etries. We prove a counting rule for the number of unstable NG modes in te
rms of correlation functions of broken symmetry generators. Based on our u
nified description\, we further give a simple new example where one of the
NG modes associated with the spontaneous 0-form symmetry breaking U(1) $\
\times$ U(1) $\\to$ 1 becomes unstable.\n\nhttps://conference-indico.kek.j
p/event/181/contributions/3819/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3819/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Solitonic symmetry beyond homotopy: invertibility from bordism and
non-invertibility from TQFT
DTSTART:20221207T052000Z
DTEND:20221207T054000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3818@conference-indico.kek.jp
DESCRIPTION:Speakers: Shi Chen (The University of Tokyo)\n\nSolitonic symm
etry is believed to follow the homotopy-group classification of topologica
l solitons. Here\, we point out a more sophisticated algebraic structure w
hen solitons of different codimensions coexist in the spectrum. We uncover
this phenomenon in a concrete quantum field theory\, the $4$d $\\mathbb{C
}P^1$ model. This model has two kinds of solitonic excitations\, vortices
and hopfions\, which would follow two $U(1)$ solitonic symmetries accordin
g to homotopy groups. Nevertheless\, we demonstrate the nonexistence of
the hopfion $U(1)$ symmetry by evaluating the hopfion charge of vortex op
erators. We clarify that what conserves hopfion numbers is a non-invertibl
e symmetry generated by 3d spin topological quantum field theories (TQFTs)
. Its invertible subgroup is just $\\mathbb{Z}_2$\, which we recognize as
a spin bordism invariant. Compared with the 3d $\\mathbb{C}P^1$ model\, ou
r work suggests a unified description of solitonic symmetries and coupling
s to topological phases.\n\nhttps://conference-indico.kek.jp/event/181/con
tributions/3818/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3818/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bond-weighting method for the Grassmann tensor renormalization gro
up
DTSTART:20221208T052000Z
DTEND:20221208T054000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3830@conference-indico.kek.jp
DESCRIPTION:Speakers: Shinichiro Akiyama (The University of Tokyo)\n\nRece
ntly\, the tensor network description with bond weights on its edges has b
een proposed as a novel improvement for the tensor renormalization group (
TRG). The bond weight is controlled by a single hyperparameter\, whose opt
imal value is estimated in the original work via the numerical computation
of the two-dimensional critical Ising model. We develop this bond-weighte
d TRG algorithm to make it applicable to the fermionic system\, benchmarki
ng with the two-dimensional massless Wilson fermion. We show that the accu
racy with the fixed bond dimension is improved also in the fermionic syste
m and provide numerical evidence that the optimal choice of the hyperparam
eter is not affected by whether the system is bosonic or fermionic. In add
ition\, by monitoring the singular value spectrum\, we find that the scale
-invariant structure of the renormalized Grassmann tensor is successfully
kept by the bond-weighting technique.\n\nhttps://conference-indico.kek.jp/
event/181/contributions/3830/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3830/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Real-time evolution of quantum tunneling via the thimble approach
DTSTART:20221208T064000Z
DTEND:20221208T070000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3833@conference-indico.kek.jp
DESCRIPTION:Speakers: Atis Yosprakob (Niigata University)\n\nQuantum tunne
ling has been playing an important role in various fields of theoretical p
hysics. So far\, the only way for us to gain insights into the mechanism i
s to use the instanton method\, which is based on imaginary-time formalism
. However\, to study its dynamics\, it is essential to use real-time forma
lism\, whose path integral is highly oscillatory. Fortunately\, Picard-Lef
schetz theory can be used to make the integral converge\, enabling us to p
erform the Monte Carlo simulation. In this work\, we apply the Monte Carlo
simulation based on thimbles to study the real-time evolution of the tunn
eling process. In particular\, we show that quantum tunneling can be chara
cterized by the dominance of complex classical solutions in the $\\hbar\\r
ightarrow0$ limit.\n\nhttps://conference-indico.kek.jp/event/181/contribut
ions/3833/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3833/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fluid model of black hole/string transition
DTSTART:20221208T070000Z
DTEND:20221208T072000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3843@conference-indico.kek.jp
DESCRIPTION:Speakers: Yoshinori Matsuo (Kindai University)\n\nWe propose a
fluid model of self-gravitating strings. It is expected that black holes
turn into strings around the end of black hole evaporation. The transition
will occur near the Hagedorn temperature. After the transition\, strings
would form a bound state by the self-gravitation. Horowitz and Polchinski
formulated a model of self-gravitating strings by using winding strings wr
apping on the Euclidean time circle. We first show that winding strings in
the Horowitz-Polchinski model approximately behave as a perfect fluid. Th
en\, we solve the Einstein equation for the fluid of winding strings. Our
solution reproduces behaviors of the self-gravitating string solution in t
he Horowitz-Polchinski model near the Hagedorn temperature\, while it appr
oaches the Schwarzschild black hole in low temperature. Thus\, our fluid m
odel of self-gravitating strings gives a description of the transition bet
ween black holes and strings.\n\nhttps://conference-indico.kek.jp/event/18
1/contributions/3843/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3843/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scalar\, fermionic and supersymmetric field theories with subsyste
m symmetries
DTSTART:20221207T064000Z
DTEND:20221207T070000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3822@conference-indico.kek.jp
DESCRIPTION:Speakers: Taiichi Nakanishi (YITP\, Kyoto Univ.)\n\nIt is know
n that the field-theoretic model describing fractons\, which have attracte
d much attention in condensed matter physics\, is a theory with non-Lorent
z covariant symmetry\, called subsystem symmetry. More recently\, a fermio
nic field theory that seems to be related to fractons has been constructed
. In this presentation\, we discuss detailed properties of these field the
ories.\n\nhttps://conference-indico.kek.jp/event/181/contributions/3822/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3822/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Boson-fermion duality with subsystem symmetry
DTSTART:20221207T062000Z
DTEND:20221207T064000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3821@conference-indico.kek.jp
DESCRIPTION:Speakers: Weiguang Cao (Kavli IPMU\, University of Tokyo)\n\nI
n this talk\, I will introduce an exact duality in (2 + 1)d between the fe
rmionization of a bosonic theory with a $Z_2$ subsystem symmetry and a fer
mionic theory with a $Z_2$ subsystem fermion parity symmetry. A typical ex
ample is the duality between the fermionization of the plaquette Ising mod
el and the plaquette fermion model. I will establish the exact duality on
the lattice by using the generalized Jordan-Wigner map\, with a careful d
iscussion on the mapping of the twist and symmetry sectors. This motivates
us to introduce the subsystem Arf invariant\, which exhibits a foliation
structure.\n\nhttps://conference-indico.kek.jp/event/181/contributions/382
1/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3821/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase structure of linear quiver gauge theories from anomaly match
ing
DTSTART:20221207T062000Z
DTEND:20221207T064000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3826@conference-indico.kek.jp
DESCRIPTION:Speakers: Hiroki Wada (Osaka University)\n\nWe consider the ph
ase structure of the linear quiver gauge theory\, using the 't Hooft anoma
ly matching condition. This theory is characterized by the length $K$ of t
he quiver diagram. When $K$ is even\, the symmetry and its anomaly are the
same as those of massless QCD. Therefore\, one can expect that the sponta
neous symmetry breaking similar to the chiral symmetry breaking occurs. On
the other hand\, when $K$ is odd\, the anomaly matching condition is sati
sfied by the massless composite fermions. We also consider the thermal par
tition function under the twisted boundary conditions. When $K$ is even\,
from the anomaly at finite temperature\, we estimate the relation between
the critical temperatures associated with the confinement/deconfinement an
d the breaking of the global symmetry. Finally we discuss the anomaly matc
hing at finite temperature when $K$ is odd.\n\nhttps://conference-indico.k
ek.jp/event/181/contributions/3826/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3826/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Analytical analysis of the bosonic Lorentzian IKKT matrix model wi
th a mass term
DTSTART:20221207T054000Z
DTEND:20221207T060000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3824@conference-indico.kek.jp
DESCRIPTION:Speakers: Worapat Piensuk (SOKENDAI)\n\nThe IKKT matrix model
was conjectured to provide a non-perturbative definition of the type IIB s
tring theory. One of the most attractive features of this model is that sp
acetime emerges dynamically by interpreting the matrix degrees of freedom
as ten-dimensional spacetime coordinates. There have been many numerical s
imulations suggesting the appearance of (3+1)-dimensional expanding univer
se. In the recent work [1]\, it was shown that the spacetime arising from
the bosonic version of the model is Euclidean and complex. To realize a re
al Lorentzian spacetime\, an additional mass term was then introduced. In
this work\, we investigate the bosonic Lorentzian IKKT matrix model with a
mass term analytically. [1] K. Hatakeyama\, K. Anagnostopoulos\, T. Az
uma\, M. Hirasawa\, Y. Ito\, J. Nishimura\, S. K. Papadoudis\, and A. Tsuc
hiya\, Complex Langevin studies of the emergent space-time in the type IIB
matrix model\, in East Asia Joint Symposium on Fields and Strings 2021\,
1\, 2022. arXiv:2201.13200.\n\nhttps://conference-indico.kek.jp/event/181/
contributions/3824/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3824/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Numerical studies on the IKKT matrix model using Lefschetz thimble
method
DTSTART:20221207T052000Z
DTEND:20221207T054000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3823@conference-indico.kek.jp
DESCRIPTION:Speakers: Naoyuki Yamamori (SOKENDAI)\n\nThe IKKT matrix model
is a candidate for the non-perturbative formalization of superstring t
heory in 10 dimension. This model suggests that the (9+1)-dimensional Lore
ntz symmetry is spontaneously broken and (3+1)-dimensional space-time emer
ges. However\, the sign problem is the main obstacle to the numerical anal
ysis of this model. Recently\, numerical studies has been conducted by com
plex Langevin method to overcome the sign problem\, but this method has ce
rtain application limit. Therefore\, we performed\, for the first time\
, the calculation using another method\, Lefschetz thimble method\, which
does not have such application limit.\n\nhttps://conference-indico.kek.jp/
event/181/contributions/3823/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3823/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Supersymmetric affine Toda field equations and ODE/IM corresponden
ce
DTSTART:20221208T060000Z
DTEND:20221208T062000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3840@conference-indico.kek.jp
DESCRIPTION:Speakers: Mingshuo Zhu (Tokyo Institute of Technology)\n\nThe
linear differential system of the $\\mathcal{N}=1$ super affine Toda field
equations (ATFEs) (Classical) with Lie superalgebras is studied. The modi
fied linear equations reduce to a couple of ordinary differential equation
s (ODEs). The $osp(2|2)^{(2)}$ giving the Schrodinger equation with square
d potential verifies the ODE/IM correspondence.\n\nhttps://conference-indi
co.kek.jp/event/181/contributions/3840/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3840/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Krylov complexity of free and interacting scalar QFTs in the conti
nuum limit
DTSTART:20221208T072000Z
DTEND:20221208T074000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3844@conference-indico.kek.jp
DESCRIPTION:Speakers: Mitsuhiro Nishida (Pohang University of Science and
Technology)\n\nKrylov complexity is a measure of operator growth that is c
onsidered to capture quantum chaos in lattice systems. We study the Krylov
complexity and Lanczos coefficients of free scalar theories and their per
turbative theories in the continuum limit. In particular\, we discuss the
effects of mass\, hard UV cutoff\, thermal mass\, and perturbative interac
tions.\n\nhttps://conference-indico.kek.jp/event/181/contributions/3844/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3844/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalization group approach to cMERA
DTSTART:20221208T064000Z
DTEND:20221208T070000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3842@conference-indico.kek.jp
DESCRIPTION:Speakers: Takaaki Kuwahara (Shizuoka University)\n\nThe MERA h
as attracted attention as a model that describes the geometry that emerges
from boundary theory. Its continuous version\, the cMERA\, is expected to
be a method to derive geometry directly from a continuous theory. In free
field theories\, the cMERA was successfully constructed based on the vari
ational method. However\, from the holographic point of view\, it is cruci
al to construct the cMERA for interacting theories. Since constructing the
cMERA is equivalent to determining the scale dependence of the wavefuncti
onal\, we consider an approach based on the renormalization group. We firs
t construct the cMERA perturbatively in interacting scalar theories\, and
furthermore\, we derive non-perturbative renormalization group equation fo
r the wavefunctional.\n\nhttps://conference-indico.kek.jp/event/181/contri
butions/3842/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3842/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Optimized flow for generalized Lefschetz thimble method
DTSTART:20221207T070000Z
DTEND:20221207T072000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3828@conference-indico.kek.jp
DESCRIPTION:Speakers: Katsuta Sakai (Tokyo Medical and Dental University)\
n\nGeneralized thimble method is one of powerful methods to overcome the s
ign problem in numerical simulations. We point out that the method has a s
ubtle property when applied to a nearly continuum system. The point is tha
t solutions of the flow equation generically show exponential behavior\, a
nd the growing rates largely differ depending on the modes. It implies
the ranges of the flow time where we resolve the sign problem and the Erg
odicity problem are largely different mode by mode. It can leads to a grea
t inefficiency in the simulation\, in particular where we move the samplin
g point on the original contour. In order to deal with the subtlety\, we p
ropose the modified flow equation which preserves the properties of the or
iginal one and nevertheless normalizes the growing rates. As a demonstrati
on\, we reproduce the real-time evolution of an anharmonic oscillator with
the modified flow\, where it is difficult to perform the simulation with
the original one.\n\nhttps://conference-indico.kek.jp/event/181/contributi
ons/3828/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3828/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spontaneous CP breaking in 4D SU(N) gauge theory at $\\theta=\\pi$
and its restoration at finite temperature
DTSTART:20221207T064000Z
DTEND:20221207T070000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3827@conference-indico.kek.jp
DESCRIPTION:Speakers: Akira Matsumoto (RIKEN iTHEMS)\n\nRecent studies on
the 't Hooft anomaly matching condition for 4D SU($N$) gauge theory have s
uggested that the phase structure at $\\theta=\\pi$ should be nontrivial.
Namely\, some symmetry will be spontaneously broken\, or gapless modes
will appear. In the large-$N$ limit\, it is known that CP symmetry at $
\\theta=\\pi$ is broken in the confined phase\, while it restores in th
e deconfined phase\, which is indeed one of the consequence of the anomaly
matching. However\, at small $N$\, one may find a qualitatively differ
ent phase structure\, which will be another possible scenario consistent w
ith the anomaly matching. Here we investigate this issue for $N=2$ by d
irect lattice calculations. The crucial point of our method is that the
restoration of CP symmetry can be probed by the sudden change of the topo
logical charge distribution at $\\theta=0$\, which can be seen by simul
ating the theory at imaginary $\\theta$ without the sign problem. Our r
esults suggest that the CP symmetry at $\\theta=\\pi$ is restored at highe
r temperature than the deconfining temperature unlike the situation in the
large-$N$ limit.\n\nhttps://conference-indico.kek.jp/event/181/contributi
ons/3827/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3827/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fractional topological charge in lattice Abelian gauge theory
DTSTART:20221207T060000Z
DTEND:20221207T062000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3825@conference-indico.kek.jp
DESCRIPTION:Speakers: Motokazu Abe (Kyushu University)\n\nSince Gaiotto et
.~al discussed the low-energy dynamics of gauge theories on the basis of t
he mixed ’t Hooft anomaly between discrete and higher-form symmetries\,
this type of application of the anomaly has been studied vigorously. In th
is study\, in order to understand this type of application of the anomaly
in a completely regularized framework\, we formulate the fractional topolo
gical charge associated with the $U(1)/\\mathbb{Z}_q$ principal bundle in
the compact $U(1)$ lattice gauge theory by generalizing L\\“uscher’s c
onstruction. This fractional topological charge in lattice gauge theory is
$\\mathbb{Z}_q$ one-form gauge invariant and odd under the lattice time
reversal transformation. By employing these properties of the fractional t
opological charge\, we can show that the $U(1)$ gauge theory containing ma
tter fields with charge $q\\in 2\\mathbb{Z}$ has the mixed ’t Hooft anom
aly between the $\\mathbb{Z}_q$ one-form symmetry and the time reversal sy
mmetry when $\\theta=\\pi$. This is analogous to the mixed ’t Hooft anom
aly between the $\\mathbb{Z}_N$ one-form symmetry and the time reversal sy
mmetry in $SU(N)/\\mathbb{Z}_N$ theory when $\\theta=\\pi$.\n\nhttps://con
ference-indico.kek.jp/event/181/contributions/3825/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3825/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exact solution of the finite Grosse-Wulkenhaar model
DTSTART:20221208T070000Z
DTEND:20221208T072000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3834@conference-indico.kek.jp
DESCRIPTION:Speakers: Naoyuki Kanomata (Tokyo University of Science)\n\nWe
find the exact solutions of the $\\Phi_{2}^{3}$ finite matrix model (Gros
se-Wulkenhaar model). In the $\\Phi_{2}^{3}$ finite matrix model\, multipo
int correlation functions are expressed as $G_{|a_{1}^{1}\\ldots a_{N_{1}}
^{1}|\\ldots|a_{1}^{B}\\ldots a_{N_{B}}^{B}|}$. The $\\sum_{i=1}^{B}N_{i}$
-point function denoted by $G_{|a_{1}^{1}\\ldots a_{N_{1}}^{1}|\\ldots|a_{
1}^{B}\\ldots a_{N_{B}}^{B}|}$ is given by the sum over all Feynman diagra
ms (ribbon graphs) on Riemann surfaces with $B$-boundaries\, and each $|a^
{i}_{1}\\cdots a^{i}_{N_{i}}|$ corresponds to the Feynman diagrams having
$N_{i}$-external lines from the $i$-th boundary. It is known that any $G_{
|a_{1}^{1}\\ldots a_{N_{1}}^{1}|\\ldots|a_{1}^{B}\\ldots a_{N_{B}}^{B}|}$
can be expressed using $G_{|a^{1}|\\ldots|a^{n}|}$ type $n$-point function
s. Thus we focus on rigorous calculations of $G_{|a^{1}|\\ldots|a^{n}|}$.
The formula for $G_{|a^{1}|\\ldots|a^{n}|}$ is obtained\, and it is achiev
ed by using the partition function $\\mathcal{Z}[J]$ calculated by the Har
ish-Chandra-Itzykson-Zuber integral.\n\nhttps://conference-indico.kek.jp/e
vent/181/contributions/3834/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3834/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A microscopic description of the Witten effect with negatively mas
sive fermions
DTSTART:20221208T052000Z
DTEND:20221208T054000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3838@conference-indico.kek.jp
DESCRIPTION:Speakers: Hidenori Fukaya (Osaka University)\n\nInside topolog
ical insulators or in the theta=pi vacuum\, magnetic monopoles gain fract
ional electric charges\, which is known as the Witten effect. In this work
\, we try to give a microscopic description for this phenomenon\, solving
a "negatively" massive Dirac equation. The "Wilson term" plays a key role
in 1) identifying the sign of the fermion mass\, 2) confirming evidence fo
r dynamical domain-wall creations\, and 3) understanding why the electric
charge is fractional.\n\nhttps://conference-indico.kek.jp/event/181/contri
butions/3838/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3838/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hierarchical structure of physical Yukawa couplings from matter fi
eld Kaehler metric
DTSTART:20221209T062000Z
DTEND:20221209T064000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3854@conference-indico.kek.jp
DESCRIPTION:Speakers: Hajime Otsuka (Kyushu University)\n\nWe study the im
pacts of matter field Kaehler metric on physical Yukawa couplings in strin
g compactifications. Since the Kaehler metric is non-trivial in general
\, the kinetic mixing of matter fields opens a new avenue for realizing
a hierarchical structure of physical Yukawa couplings\, even when holo
morphic Yukawa couplings have the trivial structure. The hierarchical Yuka
wa couplings are demonstrated by couplings of pure untwisted modes on toro
idal orbifolds and their resolutions in the context of heterotic string
theory with standard embedding. Also\, we study the hierarchical coupling
s among untwisted and twisted modes on resolved orbifolds.\n\nhttps://c
onference-indico.kek.jp/event/181/contributions/3854/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3854/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Numerical study of quantum cosmology by the generalized Lefschetz
thimble method
DTSTART:20221209T060000Z
DTEND:20221209T062000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3848@conference-indico.kek.jp
DESCRIPTION:Speakers: Chien Yu Chou (SOKENDAI)\n\nQuantum cosmology is est
ablished as a way to understand the beginning of universe. Picard-Lefschet
z theory has raised recent interest on the “tunneling from nothing” pr
oposal by Vilenkin and the “no boundary” proposal by Hartle-Hawking. T
he two proposals can be closely related through analysis on saddle points
and boundary conditions. In this work\, we demonstrate a first principle c
alculation on the mini-superspace model. We overcome the sign problem aris
ing from the Lorentzian path integral formulation with generalized Lefsche
tz thimble method. At the initial time\, we also perform calculations usin
g the Robin boundary condition\, which interpolates the Dirichlet and Neum
ann boundary conditions. The Stoke’s theorem from Vilenkin to Hartle-Haw
king can be shown at the critical value of interpolating factor in Robin b
oundary condition.\n\nhttps://conference-indico.kek.jp/event/181/contribut
ions/3848/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3848/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Formation of chiral soliton lattice
DTSTART:20221207T060000Z
DTEND:20221207T062000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3820@conference-indico.kek.jp
DESCRIPTION:Speakers: Kentaro Nishimura (KEK)\n\nThe Chiral Soliton Lattic
e (CSL) is a lattice structure composed of domain walls aligned in paralle
l at equal intervals\, which is energetically stable in the presence of a
background magnetic field and a finite (baryon) chemical potential due to
the topological term originated from the chiral anomaly. We study its form
ation from the vacuum state\, with describing the CSL as a layer of domain
-wall disks surrounded by the vortex or string loop\, based on the Nambu-G
oto-type effective theory. We show that the domain wall nucleates via quan
tum tunneling when the magnetic field is strong enough. We evaluate its nu
cleation rate and determine the critical magnetic field strength with whic
h the nucleation rate is no longer exponentially suppressed. We apply this
analysis to the neutral pion in the two-flavor QCD as well as the axion-l
ike particles (ALPs) with a finite (baryon) chemical potential under an ex
ternal magnetic field. In the former case\, even though the CSL state is m
ore energetically stable than the vacuum state and the nucleation rate bec
omes larger for sufficiently strong magnetic field\, it cannot be large en
ough so that the nucleation of the domain walls is not exponentially suppr
essed and promoted\, without suffering from the tachyonic instability of t
he charged pion fluctuations. In the latter case\, we confirm that the eff
ective interaction of the ALPs generically includes the topological term r
equired for the CSL state to be energetically favored. We show that the AL
P CSL formation is promoted if the magnetic field strength and the chemica
l potential of the system is slightly larger than the scale of the axion d
ecay constant.\n\nhttps://conference-indico.kek.jp/event/181/contributions
/3820/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3820/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bounds on expectation values in Quantum mechanics
DTSTART:20221208T060000Z
DTEND:20221208T062000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3832@conference-indico.kek.jp
DESCRIPTION:Speakers: Takeshi Morita (Shizuoka University)\n\nThe range of
motion of a particle with certain energy $E$ confined in a potential is d
etermined from the energy conservation law in classical mechanics. The cou
nterpart of this question in quantum mechanics can be thought of as what t
he possible range of the expectation values of the position operator $⟨x
⟩$ of a particle\, which satisfies $E=⟨H⟩$. This range would change
depending on the state of the particle\, but the universal upper and lower
bounds\, which is independent of the state\, must exist. In this talk\, I
show that these bounds can be derived by using the uncertainty relations
and their generalization.\n\nhttps://conference-indico.kek.jp/event/181/co
ntributions/3832/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3832/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Path Integral and Phase Space Dynamics of U(1) Quantum Pendulum
DTSTART:20221208T054000Z
DTEND:20221208T060000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3831@conference-indico.kek.jp
DESCRIPTION:Speakers: Tetsuo Matsui (Kindai University)\n\nWe study the ti
me dependent behavior of a quantum pendulum by path-integral and Wigner-We
yl phase space quantum mechanics. In both cases\, we encounter a negative
sign problem\, and propose certain approximation similar to the truncated
Wigner approximation\, which sheds some light on the sign problem.\n\nhttp
s://conference-indico.kek.jp/event/181/contributions/3831/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3831/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The emergence of (3+1)-dimensional space-time in the type IIB matr
ix model
DTSTART:20221208T050000Z
DTEND:20221208T052000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3829@conference-indico.kek.jp
DESCRIPTION:Speakers: Kohta Hatakeyama (KEK)\n\nWe perform numerical studi
es of the type IIB matrix model\, which was proposed as a nonperturbative
formulation of superstring theory in 1996. We overcome the sign problem by
using the complex Langevin method and show that it is necessary to add a
term corresponding to infrared regularization to the action of the origina
l model. By these procedures\, we find the (3+1)D expanding space-time in
this model.\n\nhttps://conference-indico.kek.jp/event/181/contributions/38
29/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3829/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon D-term in holographic QCD
DTSTART:20221208T072000Z
DTEND:20221208T074000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3835@conference-indico.kek.jp
DESCRIPTION:Speakers: Mitsutoshi Fujita (Sun Yat-Sen University)\n\nThe D-
term is one of the conserved charges of hadrons defined as the forward lim
it of the gravitational form factor D(t). We calculate the nucleon’s D-t
erm in a holographic QCD model in which the nucleon is described as a soli
ton in five dimensions. We show that the form factor D(t) is saturated by
the exchanges of infinitely many 0++ and 2++ glueballs dual to transverse-
traceless metric fluctuations on the Wick rotated AdS7 black hole geometry
. We refer to this phenomenon as ‘glueball dominance’\, in perfect
analogy to the vector meson dominance of the electromagnetic form factors.
However\, the value at vanishing momentum transfer D(t = 0) can be interp
reted as due to the exchange of pairs of pions and infinitely many vector
and axial-vector mesons without any reference to glueballs. We find that t
he D-term is slightly negative as a result of a cancellation between the i
sovector and isoscalar meson contributions.\n\nhttps://conference-indico.k
ek.jp/event/181/contributions/3835/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3835/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Curved domain-wall fermion and its anomaly inflow
DTSTART:20221208T050000Z
DTEND:20221208T052000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3837@conference-indico.kek.jp
DESCRIPTION:Speakers: Shoto Aoki (Osaka University)\n\nWe propose a lattic
e fermion formulation with a curved domain-wall mass term as a nonperturba
tive regularization of quantum field theory in a gravitational backgrou
nd. In KEK-TH 2021 last year\, we reported that the edge-localized modes a
ppear on the curved domain-wall in free fermion theory on a square lattice
\, and they feel gravity through the induced spin and spin-c connections.
We continue the study adding nontrivial $U(1)$ gauge field background to t
he $S^1$ or $S^2$ domain-wall fermion systems. We find a good consistency
with continuum theory in the anomaly inflow described by the Atiyah-Patodi
-Singer index. This talk is based on our paper https://arxiv.org/abs/2203.
03782 and some preliminary results.\n\nhttps://conference-indico.kek.jp/ev
ent/181/contributions/3837/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3837/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Reality from maximizing overlap in the periodic complex action the
ory
DTSTART:20221208T054000Z
DTEND:20221208T060000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3839@conference-indico.kek.jp
DESCRIPTION:Speakers: Keiichi Nagao (Ibaraki University)\n\nWe study the p
eriodic complex action theory (CAT) by imposing a periodic condition in th
e future-included CAT where the time integration is performed from the pas
t to the future\, and extend a normalized matrix element of an operator O\
, which is called the weak value in the real action theory\, to another ex
pression. We present two theorems stating that the expression becomes real
for O being Hermitian with regard to a modified inner product that makes
a given non-normal Hamiltonian H normal. The first theorem holds for a giv
en period $t_p$ in a case where the number of eigenstates having the maxim
al imaginary part $B$ of the eigenvalues of H is just one\, while the seco
nd one stands for $t_p$ selected such that the absolute value of the trans
ition amplitude is maximized in a case where $B \\leq 0$ and $|B|$ is much
smaller than the distances between any two real parts of the eigenvalues
of H. The latter proven via a number-theoretical argument suggests that\,
if our universe is periodic\, then even the period could be an adjustment
parameter to be determined in the Feynman path integral. This is a variant
type of the maximization principle that we previously proposed. This talk
is based on the collaboration with Holger Bech Nielsen [Prog. Theor. Exp.
Phys. 2022 (9) 091B01] (arXiv:2203.07795 [quant-ph]).\n\nhttps://conferen
ce-indico.kek.jp/event/181/contributions/3839/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3839/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Path integrals of perturbative strings on all the curved backgroun
ds from string geometry theory and a potential energy of the backgrounds
DTSTART:20221209T062000Z
DTEND:20221209T064000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3849@conference-indico.kek.jp
DESCRIPTION:Speakers: Matsuo Sato (Hirosaki University)\n\nOne perturbativ
e string theory is defined on one fixed background. On the other hand\, it
is necessary that a non-perturbative formulation of string theory include
s all the perturbatively stable vacua and perturbative string theories on
various curved backgrounds are derived from the single theory. In this tal
k\, we derive perturbative string theories on all the curved backgrounds f
rom the fluctuations around fixed backgrounds in a single string geometry
theory\, which is one of the candidates of the non-perturbative formulatio
n of string theory. Furthermore\, we can define a potential energy of the
backgrounds because they do not depend on the string geometry time. A bac
kground can be determined by minimizing the energy. Because this mechanis
m does not depend on supersymmetry\, we can study general compactification
s. We discuss this application to string phenomenology.\n\nhttps://confere
nce-indico.kek.jp/event/181/contributions/3849/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3849/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Application of Nambu Dynamics to Non-equilibrium thermodynamics
DTSTART:20221209T060000Z
DTEND:20221209T062000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3853@conference-indico.kek.jp
DESCRIPTION:Speakers: Yoshiki Matsuoka (The Open University of Japan)\n\nI
n 1973\, Yoichiro Nambu published a GHD paper(titled Generalized Hamitonia
n Dynamics). This paper was the beginning of what is now known as Namb
u dynamics. Nambu dynamics is the generalization of Hamiltonian dynami
cs involving multiple Hamiltonians\, and has applications to string theory
and fluid dynamics. In this talk\, We will present our successful form
ulation of Nambu dynamics applied to Non-equilibrium thermodynamics\, incl
uding the concrete example. The content of this talk is available at ar
Xiv:2209.08469.\n\nhttps://conference-indico.kek.jp/event/181/contribution
s/3853/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3853/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Axiomatic rational RG flow
DTSTART:20221209T054000Z
DTEND:20221209T060000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3852@conference-indico.kek.jp
DESCRIPTION:Speakers: Ken Kikuchi (YMSC)\n\nWe axiomatize rational massles
s renormalization group flow as Kan extension.\n\nhttps://conference-indic
o.kek.jp/event/181/contributions/3852/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3852/
END:VEVENT
BEGIN:VEVENT
SUMMARY:6d Seiberg-Witten curves for E-string and Little string theories f
rom 5-brane webs
DTSTART:20221209T052000Z
DTEND:20221209T054000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3851@conference-indico.kek.jp
DESCRIPTION:Speakers: Yuji Sugimoto (POSTECH)\n\nWe propose a systematic w
ay of obtaining 6d Seiberg-Witten curves from Type IIB 5-brane webs with o
r without orientifold planes\, by generalizing the construction of 5d Seib
erg-Witten curves from 5-brane webs. We apply our construction to two k
inds of theories: 6d E-string theory and little string theory. In parti
cular\, the expression of Seiberg-Witten curve for the E-string theory dra
stically reduces compared with Eguchi-Sakia's curves. The Seiberg-Witt
en curve for little string theory that we consider is consistent with the
known result. Furthermore\, we discuss some other possibilities which m
ay define different little string theories.\n\nhttps://conference-indico.k
ek.jp/event/181/contributions/3851/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3851/
END:VEVENT
BEGIN:VEVENT
SUMMARY:No Smooth Beginning for The Universe and Trans-Planckian Physics
DTSTART:20221209T054000Z
DTEND:20221209T060000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3847@conference-indico.kek.jp
DESCRIPTION:Speakers: Hiroki Matsui (Yukawa Institute for Theoretical Phys
ics\, Kyoto University)\n\nIn minisuperspace quantum cosmology\, the Loren
tzian path integral formulations of the no-boundary and tunneling proposal
s have recently been analyzed\, but it has been pointed out that the wave
function of linearized perturbations around a homogeneous and isotropic ba
ckground is of an inverse Gaussian form and thus that their correlation fu
nctions are divergent. In this talk\, I will discuss the problem and revis
it this issue of the Lorentzian quantum cosmology by modifying the dispers
ion relation based on trans-Planckian physics. I consider two modified dis
persion relations\, the generalized Corley/Jacobson dispersion relation wi
th higher momentum terms and the Unruh dispersion relation with a trans-Pl
anckian mode cut-off\, as examples\, and show that the inverse Gaussian pr
oblem of perturbations in the Lorentzian quantum cosmology is hard to over
come with minimal modifications of the gravity theory\, such as modifying
the dispersion relation at short distances.\n\nhttps://conference-indico.k
ek.jp/event/181/contributions/3847/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3847/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entropy constraints on effective field theory
DTSTART:20221209T052000Z
DTEND:20221209T054000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3846@conference-indico.kek.jp
DESCRIPTION:Speakers: Daiki Ueda (Peking University)\n\nIn effective field
theory\, the positivity bounds of higher derivative operators are derived
from analyticity\, causality\, and unitarity. We show that the positivity
bounds on a class of effective field theories\, e.g.\, dimension-eight te
rm of a single massless scalar field\, the Standard Model Effective Field
Theory dimension-eight $SU(N)$ gauge bosonic operators\, and Einstein-Maxw
ell theory with higher-derivative operators\, generated by interactions be
tween heavy and light degrees of freedom can be derived by the non-negativ
ity of relative entropy. For such a class of effective field theories\, we
prove that the interactions increase thermodynamic entropy at fixed energ
y and charge\, which is intimately connected with the extremality relation
s of black holes exhibiting Weak-Gravity-Conjecture. These arguments are a
pplicable when corrections from the interactions involving higher-derivati
ve operators of light fields are not dominant in the effective field theor
ies. The entropy constraint is a consequence of the Hermiticity of Hamilto
nian\, and any theory violating the non-negativity of entropy would not re
spect the second law of thermodynamics.\n\nhttps://conference-indico.kek.j
p/event/181/contributions/3846/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3846/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entropy and its conservation in expanding Universe
DTSTART:20221209T050000Z
DTEND:20221209T052000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3845@conference-indico.kek.jp
DESCRIPTION:Speakers: Shinya Aoki (Yukawa Institute for Theoretical Physic
s\, Kyoto University)\n\nWe investigate properties of the conserved charge
in general relativity\, recently proposed by one of the present authors w
ith his collaborators\, in the inflation era\, the matter dominated era an
d the radiation dominated era of the expanding Universe. We show that
the conserved charge becomes the Bekenstein-Hawking entropy in the inflati
on era\, and it becomes the matter entropy and the radiation entropy in th
e matter and radiation dominated eras\, respectively\, while the charge it
self is always conserved. These properties are qualitatively confirmed by
a numerical analysis of a model with a scalar field and radiations. Re
sults in this paper provide more evidences on the interpretation that the
conserved charge in general relativity corresponds to entropy.\n\nhttps://
conference-indico.kek.jp/event/181/contributions/3845/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3845/
END:VEVENT
BEGIN:VEVENT
SUMMARY:M2-branes and q-Painleve equations
DTSTART:20221209T050000Z
DTEND:20221209T052000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3850@conference-indico.kek.jp
DESCRIPTION:Speakers: Tomoki Nosaka (Kavli Institute for Theoretical Scien
ces\, University of Chinese Academy of Sciences)\n\nIt is known that the p
artition function of ABJM theory\, the 3d Chern-Simons matter theory on N
M2-branes probing $C^4/Z_k$ orbifold\, solves a non-linear difference rela
tion called q-deformed Painleve III system. This connection is motivated w
ith the idea of Painleve/gauge correspondence and the topological string/s
pectral theory correspondence for the quantization of algebraic curves\, w
hich also suggests that the similar connection exists for a more general c
lass of M2-brane theories. As a concrete example\, we present the connecti
on between the four node circular quiver Chern-Simons theory and the q-def
ormed Painleve VI system. We also demonstrate how the partition function o
f this theory reduces to the partition function of the ABJM theory under t
he coalescence limit of the q-Painleve systems.\n\nhttps://conference-indi
co.kek.jp/event/181/contributions/3850/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3850/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-invertible symmetries on the lattice
DTSTART:20221207T012000Z
DTEND:20221207T022000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3860@conference-indico.kek.jp
DESCRIPTION:Speakers: Satoshi Yamaguchi (Osaka University)\n\nRecently\, t
he concept of symmetry has been generalized\, and what was not traditional
ly called symmetry is now being used similarly as symmetry. In this talk\,
we discuss a class of such generalized symmetries\, called non-invertible
symmetries\, from the viewpoint of the lattice field theories. In particu
lar\, we construct topological defects in four-dimensional Z$_2$ lattice g
auge theory\, including the Kramers-Wannier-Wegner (KWW) duality defect\;
the KWW defect is an example of non-invertible symmetries. Also\, we consi
der the system with a boundary and discuss the relations between the disk
partition functions derived from the non-invertible symmetry.\n\nhttps://c
onference-indico.kek.jp/event/181/contributions/3860/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3860/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Symmetries in QFT and applications
DTSTART:20221207T000000Z
DTEND:20221207T010000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3859@conference-indico.kek.jp
DESCRIPTION:Speakers: Yuya Tanizaki (YITP\, Kyoto University)\n\nQuantum f
ield theory is a framework that can describe universal behavior in the low
-energy region for quantum many-body systems\, but solving it is often ver
y difficult as it often becomes strongly coupled systems. One of possible
approaches to such problems is to constrain the dynamics from general view
points instead of solving the dynamics directly. Symmetry in field theorie
s has played a very important role from this perspective. In recent years\
, the notion of symmetry itself has been generalized in a remarkable manne
r\, and such a generalization produces rigorous constraints on strongly-co
upled field theories. In this talk\, the generalized notion of symmetry wi
ll be explained from the basics and some of its applications will be intro
duced.\n\nhttps://conference-indico.kek.jp/event/181/contributions/3859/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3859/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sign problem and the Worldvolume Hybrid Monte Carlo method
DTSTART:20221208T000000Z
DTEND:20221208T010000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3862@conference-indico.kek.jp
DESCRIPTION:Speakers: Masafumi Fukuma (Kyoto University)\n\nThe numerical
sign problem is one of the major obstacles to first-principles calculation
s in a variety of important systems. Typical examples include finite-densi
ty QCD\, some condensed matter systems such as strongly correlated electro
n systems and frustrated spin systems\, and real-time dynamics of quantum
fields. Until very recently\, individual methods were developed for each t
arget system\, but over the past decade there has been a movement to find
a versatile solution to the sign problem. In this talk\, starting with the
basics of Markov chain Monte Carlo methods\, I first explain the essence
of the sign problem and outline some of the approaches proposed in line wi
th the movement. I then focus on methods based on the Lefschitz thimble\,
and argue that the "Worldvolume Hybrid Monte Carlo method" [Fukuma and Mat
sumoto\, arXiv:2012.08468] is a promising method due to its reliability an
d versatility. If I have time\, I also briefly discuss recent topics relat
ed to thimbles\, such as resurgence and quantum cosmology.\n\nhttps://conf
erence-indico.kek.jp/event/181/contributions/3862/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3862/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor renormalization group in field theory
DTSTART:20221208T012000Z
DTEND:20221208T020000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3863@conference-indico.kek.jp
DESCRIPTION:Speakers: Daisuke Kadoh (Doshisha University)\n\nRecently\, a
novel approach using tensor renormalization group (TRG) has made great pro
gress in the numerical computation of lattice field theory. In the TRG\, p
artition functions and correlation functions are represented as tensor net
works. Their values can be evaluated by coarse-graining the network withou
t using probabilities like Monte Carlo methods. Therefore\, the TRG can ea
sily be applied to systems with sign problems. In this talk\, I review the
TRG method and talk about how it is used in computations of lattice field
theory.\n\nhttps://conference-indico.kek.jp/event/181/contributions/3863/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3863/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Expanding Edges of Quantum Hall Systems in a Cosmology Language -
Hawking Radiation from de Sitter Horizon in Edge Modes
DTSTART:20221209T012000Z
DTEND:20221209T022000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3866@conference-indico.kek.jp
DESCRIPTION:Speakers: Masahiro Hotta (Tohoku University)\n\nExpanding edge
experiments are promising to open new physics windows of quantum Hall sys
tems. In a static edge\, the edge excitation\, which is described by free
fields decoupled with the bulk dynamics\, is gapless\, and the dynamics pr
eserve conformal symmetry. When the edge expands\, such properties need no
t be preserved. We formulate a quantum field theory in 1+1 dimensional cur
ved spacetimes to analyze the edge dynamics. We propose methods to address
the following questions using edge waveforms from the expanding region: D
oes the conformal symmetry survive? Is the nonlinear interaction of the ed
ge excitations induced by edge expansion? Do the edge excitations interact
with the bulk excitations? We additionally show that the expanding edges
can be regarded as expanding universe simulators of two-dimensional dilato
n-gravity models\, including the Jackiw-Teitelboim gravity model. As an ap
plication\, we point out that our theoretical setup might simulate emissio
n of analog Hawking radiation with the Gibbons-Hawking temperature from th
e future de Sitter horizon formed in the expanding edge region.\n\nhttps:/
/conference-indico.kek.jp/event/181/contributions/3866/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3866/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stability of open-string models with broken supersymmetry
DTSTART:20221208T080000Z
DTEND:20221208T084000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3874@conference-indico.kek.jp
DESCRIPTION:Speakers: Hervé Partouche (Ecole Polytechnique)\n\nWe conside
r type IIB orientifold models in four-dimensional Minkowski spacetime\, wi
th N=2 supersymmetry spontaneously broken to 0. For an arbitrary choice of
D9- and D5-brane configuration\, we analyze the generation of masses at o
ne-loop for all open- and closed-string sector moduli fields. In order to
find non-tachyonic models at one-loop\, a key ingredient is to consider br
ane configurations with rigid positions.\n\nhttps://conference-indico.kek.
jp/event/181/contributions/3874/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3874/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holography of information and the black-hole information paradox
DTSTART:20221209T070000Z
DTEND:20221209T083000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3869@conference-indico.kek.jp
DESCRIPTION:Speakers: Suvrat Raju (ICTS)\n\nWe review recent progress in o
ur understanding of how information is localized in a theory of quantum gr
avity. In such theories\, we argue that\, subject to weak assumptions\, in
formation in any bounded region is also available in its complement. This
is very different from the manner in which quantum information is localize
d in nongravitational quantum field theories. This implies that the so-cal
led split property fails in theories of quantum gravity. We show how this
observation leads to the identification of an error in Hawking's argument
for information loss and a resolution of some paradoxes about black holes.
\nReferences:\n1) Lessons from the Information Paradox\, Phys.Rept. 943 (2
022)\, [arXiv:2012.05770]\n2) Failure of the split property in gravity and
the information paradox\, Class.Quant.Grav. 39 (2022)\, [arXiv:2110.05470
]\n\nhttps://conference-indico.kek.jp/event/181/contributions/3869/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3869/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Solving the sign problem in the IKKT model and the real-time quant
um evolution by the generalized Lefschetz thimble method
DTSTART:20221208T022000Z
DTEND:20221208T030000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3864@conference-indico.kek.jp
DESCRIPTION:Speakers: Jun Nishimura (KEK)\n\nI report on recent developmen
ts in the generalized thimble method based on the Hybrid Monte Carlo algor
ithm using backpropagation. In particular\, I discuss interesting results
for the IKKT matrix model and the real-time evolution in quantum mechanics
.\n\nhttps://conference-indico.kek.jp/event/181/contributions/3864/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3864/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constructions of Non-SUSY String Vacua with Vanishing Cosmological
Constant
DTSTART:20221209T040000Z
DTEND:20221209T044000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3876@conference-indico.kek.jp
DESCRIPTION:Speakers: Yuji Sugawara (Ritsumeikan University)\n\nIn this ta
lk\, I discuss how one can systematically construct non-supersymmetric str
ing vacua with vanishing cosmological constant at one loop\, founded mainl
y on a series of my works. After making a review of related studies\, I p
resent the constructions of the string vacua possessing such a property ba
sed on the asymmetric orbifolds in various CFT set-ups. We further discuss
the physical aspects of these vacua.\n\nhttps://conference-indico.kek.jp/
event/181/contributions/3876/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3876/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutrino Masses from Generalized Symmetry Breaking
DTSTART:20221207T040000Z
DTEND:20221207T050000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3861@conference-indico.kek.jp
DESCRIPTION:Speakers: Kantaro Ohmori (University of Tokyo)\n\nIt is now un
derstood that the concept of symmetry in quantum field theory should be va
stly generalized from the ones come from a group action on fields. The gen
eralization includes the higher-form symmetry\, which acts on extended ope
rators\, and non-invertible symmetry\, which does not have an inverse oper
ation. In particular\, a classical symmetry with an ABJ-anomaly with an ab
elian gauge group should be regarded as a non-invertible symmetry. A non-i
nvertible symmetry of this type can naturally be broken by a dynamical mon
opole loop\, and such an effect is non-perturbative. In this talk\, I disc
uss the models where this mechanism gives masses to neutrinos. There are t
wo models\, one of which gives Majorana masses and the other gives Dirac m
asses. These models contain a $Z’$ vector boson gauging the lepton numbe
r difference $U(1)_{L_\\mu-L_\\tau}$\, which is completed into a non-abeli
an group in the further UV. These UV models are relatively simple\; e.g. t
he Dirac masses model only contains the standard model fermions and three
right handed neutrinos as its fermion content. Since this work mainly focu
s on the absolute magnitude of neutrino masses\, more phenological investi
gations are desired\, e.g. about texture.\n\nhttps://conference-indico.kek
.jp/event/181/contributions/3861/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3861/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Superpositions of Massive Bodies and Gravitationally Media
ted Entanglement
DTSTART:20221209T000000Z
DTEND:20221209T010000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3865@conference-indico.kek.jp
DESCRIPTION:Speakers: Robert Wald (University of Chicago)\n\nIn order to a
void contradictions with complementarity and causality in a gedankenexperi
ment involving a quantum superposition of a massive body\, it was previous
ly shown (in arXiv:1807.07015) that it is necessary for there to be both q
uantized gravitational radiation and local vacuum fluctuations\nof the spa
cetime metric. We review this gedankenexperiment and the previously given
“back of the envelope” arguments that resolve it. We then improve upo
n this analysis by providing a precise and rigorous description of the ent
anglement and decoherence effects (given in arXiv:2112.10798). As a by-pro
duct of our analysis\, we show that under the protocols of the gedankenexp
eriment\, there is no clear distinction between entanglement mediated by
the Newtonian gravitational field of a body and entanglement mediated by o
n-shell gravitons emitted by the body. This suggests that Newtonian entang
lement implies the existence of graviton entanglement and supports the vie
w that the experimental discovery of Newtonian entanglement—as envisione
d in proposed experiments—may be viewed as evidence for the existence of
the graviton\n\nhttps://conference-indico.kek.jp/event/181/contributions/
3865/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3865/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Toward realistic de Sitter heterotic-string models with stable mod
uli
DTSTART:20221207T073000Z
DTEND:20221207T083000Z
DTSTAMP:20240720T010100Z
UID:indico-contribution-3872@conference-indico.kek.jp
DESCRIPTION:Speakers: Alon Faraggi (University of Liverpool)\n\nThe Standa
rd Model of particle physics accounts for all experimental observations to
date\, and may provide viable parameterisation up to the Planck scale. In
this eventuality\, further insight into the fundamental origin of the Sta
ndard Model parameters can only be gleaned by synthesising it with gravity
. String theory provides a framework for the construction of phenomenologi
cal models that are consistent with perturbative quantum gravity. Since th
e late eighties quasi-realistic supersymmetric string models were construc
ted that reproduce the structure of the Minimal Supersymmetric Standard Mo
dels and provide the arena for calculating the parameters of the Standard
Model from a theory of quantum gravity. In recent years these studies were
extended to non-supersymmetric string vacua including tachyon free vacua
that descends from tachyonic ten dimensional vacua. I will give an overvie
w of this work\, including work in progress toward the construction of qua
si-realistic de Sitter vacua with stable moduli.\n\nhttps://conference-ind
ico.kek.jp/event/181/contributions/3872/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/181/contributions/3872/
END:VEVENT
END:VCALENDAR