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BEGIN:VEVENT
SUMMARY:Restoration of chiral symmetry in cold and dense NambuーJona-Lasi
nio model with tensor renormalization group
DTSTART;VALUE=DATE-TIME:20201216T070000Z
DTEND;VALUE=DATE-TIME:20201216T072000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2477@conference-indico.kek.jp
DESCRIPTION:Speakers: Shinichiro Akiyama (U. of Tsukuba)\nWe analyze the c
hiral phase transition of the NambuーJona-Lasinio model in the cold and d
ense region on the lattice developing the Grassmann version of the anisotr
opic tensor renormalization group algorithm. The model is formulated with
the KogutーSusskind fermion action. We use the chiral condensate as an or
der parameter to investigate the restoration of the chiral symmetry. The f
irst-order chiral phase transition is clearly observed in the dense region
at vanishing temperature with $\\mu /T \\sim O(10^3)$ on a large volume o
f $V=1024^4$. We also present the results for the equation of state.\n\nht
tps://conference-indico.kek.jp/event/116/contributions/2477/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2477/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermodynamics of TT-bar deformed O(N) vector model
DTSTART;VALUE=DATE-TIME:20201216T070000Z
DTEND;VALUE=DATE-TIME:20201216T072000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2478@conference-indico.kek.jp
DESCRIPTION:Speakers: Junichi Haruna (Kyoto U.)\nWe investigate an irrelev
ant deformation of 2D quantum field theories\, called "TT-bar deformation"
. Although this is known as an integrable deformation\, its quantum aspect
s have not been completely understood yet. For example\, TT-bar deformatio
n of the free massless O(N) vector model is said to be Nambu-Goto action i
n the static gauge. In this talk\, we compute the thermal free energies in
both theories\, and discuss the equivalence between TT-bar deformed O(N)
vector model and Nambu-Goto action at quantum level.\n\nhttps://conference
-indico.kek.jp/event/116/contributions/2478/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2478/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The effects of fermions in the complex Langevin simulation of the
Lorentzian type IIB matrix model
DTSTART;VALUE=DATE-TIME:20201217T064000Z
DTEND;VALUE=DATE-TIME:20201217T070000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2479@conference-indico.kek.jp
DESCRIPTION:Speakers: Kohta Hatakeyama (KEK)\nThe type IIB matrix model wa
s proposed as a nonperturbative formulation of superstring theory. In part
icular\, interesting results such as the emergence of (3+1)D exponentially
expanding space-time have been obtained from the Lorentzian version of th
e model. Recently the complex Langevin simulation of the bosonic model has
been performed to avoid the previously used approximation in overcoming t
he sign problem. In this talk\, we include the effects of fermions in this
simulation to discuss their impact on the (3+1)D space-time structure.\n\
nhttps://conference-indico.kek.jp/event/116/contributions/2479/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2479/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Opening address
DTSTART;VALUE=DATE-TIME:20201215T000000Z
DTEND;VALUE=DATE-TIME:20201215T000500Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2536@conference-indico.kek.jp
DESCRIPTION:Speakers: Jun Nishimura (KEK)\nhttps://conference-indico.kek.j
p/event/116/contributions/2536/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2536/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-abelian DBI Action on Magnetized Extra Dimensions
DTSTART;VALUE=DATE-TIME:20201216T062000Z
DTEND;VALUE=DATE-TIME:20201216T064000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2476@conference-indico.kek.jp
DESCRIPTION:Speakers: Yoshihiko Abe (Kyoto U.)\nWe study the D-branes on t
he magnetized extra dimensions and corrections of the flux to the effectiv
e theories. Specifically we focus on toroidal compactifications of non-abe
lian DBI action\, and compute the flux corrections to the gauge couplings\
, the Kaehler metrics of charged matters and the scalar four-point couplin
gs. In this talk\, we would like to show the results of the dimensional re
duction and discuss the D-term potential and whether the Kaehler metric ca
n be read consistently with the D-tem potential. This talk is based on the
work in progress with Tetsutaro Higaki\, Tatsuo Kobayashi and Shintaro Ta
kada.\n\nhttps://conference-indico.kek.jp/event/116/contributions/2476/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2476/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Momentum-space entanglement in scalar field theory on the fuzzy sp
here
DTSTART;VALUE=DATE-TIME:20201216T052000Z
DTEND;VALUE=DATE-TIME:20201216T054000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2485@conference-indico.kek.jp
DESCRIPTION:Speakers: Shoichi Kawamoto (NTHU)\nIn this talk\, I will study
the quantum entanglement in the momentum space for scalar field theory on
a fuzzy sphere. In an interacting quantum field theory\, the degrees of f
reedom in momentum space show entanglement\; it quantifies the correlation
between the high/low momentum modes. On a fuzzy sphere\, an example of no
ncommutative space\, it is known that the UV and IR degrees of freedom sho
w a characteristic correlation known as UV/IR mixing. I thus study the ent
anglement entropy in the momentum space for quantum field theory defined o
n the fuzzy sphere and examine the difference from the theory on the ordin
ary sphere.\n\nhttps://conference-indico.kek.jp/event/116/contributions/24
85/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2485/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Catalytic Creation of Bubble Universe Induced by Quintessence in F
ive Dimensions
DTSTART;VALUE=DATE-TIME:20201216T064000Z
DTEND;VALUE=DATE-TIME:20201216T070000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2489@conference-indico.kek.jp
DESCRIPTION:Speakers: Issei Koga (Kyushu U.)\nWe investigate the bubble nu
cleation in five dimensional spacetime catalyzed by quintessence. We espec
ially focus on decay of a metastable Minkowski vacuum to an anti-de Sitter
vacuum and study dynamics of the bubble on which four dimensional expandi
ng universe is realized. We also discuss the trans-Planckian censorship co
njecture and impose a constraint on the parameter space of the catalysis.
As an application of this model\, we propose an inflation mechanism and an
origin of the dark energy in the context of quintessence in five dimensio
ns.\n\nhttps://conference-indico.kek.jp/event/116/contributions/2489/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2489/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex poles of QCD propagators and their interpretation
DTSTART;VALUE=DATE-TIME:20201216T072000Z
DTEND;VALUE=DATE-TIME:20201216T074000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2480@conference-indico.kek.jp
DESCRIPTION:Speakers: Yui Hayashi (Chiba U.)\nWe consider the analytic str
uctures of the gluon\, quark\, and ghost propagators in the Landau-gauge Q
CD and their implications. We first investigate the analytic structure of
the QCD propagators using the massive Yang-Mills model\, an effective mode
l of the Landau-gauge Yang-Mills theory. It turns out that the gluon and q
uark propagators in this model have complex poles that invalidate the usua
l spectral representation. We then discuss formal aspects of complex singu
larities of propagators\, especially on the reflection positivity and loca
lity\, and consider their implications on a possible quantum mechanical in
terpretation and confinement mechanism.\n\nhttps://conference-indico.kek.j
p/event/116/contributions/2480/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2480/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Space-time structure in the Lorentzian type IIB matrix model in th
e large-N limit
DTSTART;VALUE=DATE-TIME:20201216T084000Z
DTEND;VALUE=DATE-TIME:20201216T090000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2482@conference-indico.kek.jp
DESCRIPTION:Speakers: Mitsuaki Hirasawa (SOKENDAI)\nThe Lorentzian type II
B matrix model is a promising candidate for a non-perturbative formulation
of superstring theory. In the previous work\, Monte Carlo calculations pr
ovided interesting results indicating the spontaneous breaking of SO(9) to
SO(3) and the emergence of (3+1)-dimensional space-time. There\, an appro
ximation was used to avoid the sign problem\, however. In this talk\, we r
eport our results obtained by using the complex Langevin method to overcom
e the sign problem instead of using the approximation. In particular\, we
discuss the space-time structure in the large-N limit based on our results
obtained for the bosonic model at large matrix size.\n\nhttps://conferenc
e-indico.kek.jp/event/116/contributions/2482/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2482/
END:VEVENT
BEGIN:VEVENT
SUMMARY:JT gravity and the asymptotic Weil-Petersson volume
DTSTART;VALUE=DATE-TIME:20201217T050000Z
DTEND;VALUE=DATE-TIME:20201217T052000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2487@conference-indico.kek.jp
DESCRIPTION:Speakers: Yusuke Kimura (KEK)\nA path integral in Jackiw-Teite
lboim gravity is given by integrating over the volume of the moduli of Rie
mann surfaces with boundaries\, known as the "Weil-Petersson volume\," tog
ether with integrals over wiggles along the boundaries. The exact computat
ion of the Weil-Petersson volume is difficult when the genus g of Riemann
surface becomes large. Utilizing two partial differential equations known
to hold on the Weil-Petersson volumes\, we estimate asymptotic behaviors o
f the volumes with two and three boundaries when the genus g is large. We
also present a conjecture on the asymptotic expression for the general vol
ume with any number of boundaries when the genus g is large.\n\nhttps://co
nference-indico.kek.jp/event/116/contributions/2487/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2487/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Can QCD Axion explain the CMB anisotropy?
DTSTART;VALUE=DATE-TIME:20201217T070000Z
DTEND;VALUE=DATE-TIME:20201217T072000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2486@conference-indico.kek.jp
DESCRIPTION:Speakers: Kiyoharu Kawana (SNU)\nIn this talk\, I discuss a po
ssibility that the CMB anisotropy is dominantly generated by the primordia
l fluctuations of QCD axion under a circumstance that usual fluctuations b
y inflaton is too small to explain the anisotropy. The following condition
s must be satisfied in this scenario: (i) sufficient amplitudes of the CMB
anisotropy (ii) isocurvature constraint and (iii) non Gaussianity constra
int. By carefully studying those conditions\, I show that a large energy f
raction $\\Omega_A$ of the axion is necessary at the QCD phase transition\
, but simultaneously\, it must become tiny at the present era due to the i
socurvature constraint.\n\nhttps://conference-indico.kek.jp/event/116/cont
ributions/2486/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2486/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Classical Statistical simulation of Quantum Field Theory
DTSTART;VALUE=DATE-TIME:20201217T080000Z
DTEND;VALUE=DATE-TIME:20201217T082000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2483@conference-indico.kek.jp
DESCRIPTION:Speakers: Takayuki Hirayama (Chubu U.)\nWe study a classical t
heory which contains a Gaussian noise as a source. This source is responsi
ble for the creation and annihilation of particle from the vacuum and the
energy of the resultant configuration is same as the zero point energy of
quantum field theory. We show that after taking the average over the sampl
es\, the perturbative expansion of the expectation value\, n-point functio
n\, can be expressed by the tree and loop Feynman graphs which are exactly
same as those in the corresponding quantum field theory. We comment on th
e similarity and difference to the stochastic quantization.\n\nhttps://con
ference-indico.kek.jp/event/116/contributions/2483/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2483/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A physicist-friendly reformulation of the mod-two Atiyah-Patodi-Si
nger index
DTSTART;VALUE=DATE-TIME:20201215T072500Z
DTEND;VALUE=DATE-TIME:20201215T074500Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2492@conference-indico.kek.jp
DESCRIPTION:Speakers: Yoshiyuki Matsuki (Osaka U.)\nGauge anomaly in 4-dim
ensions can be viewed as a current inflow into an extra-dimension\, where
the total phase of the fermion partition function is given in a gauge inva
riant way by the Atiyah-Patodi-Singer(APS) eta-invariant of a 5-dimensiona
l Dirac operator. However\, this formalism requires a non-local boundary c
ondition\, which makes the physical roles of edge/bulk modes unclear and t
he causality of the total theory doubtful. In this talk\, we consider a sp
ecial case where the Dirac operator is in a real representation and its et
a invariant becomes the mod-two type APS index. We propose a physicist-fri
endly reformulation of the mod-two index using domain-wall fermion formali
sm\, which naturally describes how the global anomaly is canceled between
edge and bulk.\n\nhttps://conference-indico.kek.jp/event/116/contributions
/2492/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2492/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Wavefunctions in dS/CFT revisited: principal series and double-tra
ce deformations
DTSTART;VALUE=DATE-TIME:20201216T072000Z
DTEND;VALUE=DATE-TIME:20201216T074000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2491@conference-indico.kek.jp
DESCRIPTION:Speakers: Hoiki Liu (U. of Tokyo)\nWe study wavefunctions of h
eavy scalars on de Sitter spacetime and their implications to dS/CFT corre
spondence. In contrast to light fields in the complementary series\, heavy
fields in the principal series oscillate outside the cosmological horizon
. As a consequence\, the quadratic term in the wavefunction does not follo
w a simple scaling and so it is hard to identify it with a conformal two-p
oint function. In this paper\, we demonstrate that it should be interprete
d as a two-point function on a cyclic RG flow which is obtained by double-
trace deformations of the dual CFT. This is analogous to the situation in
nonrelativistic AdS/CFT with a bulk scalar whose mass squared is below the
Breitenlohner-Freedman (BF) bound. We also provide a new dS/CFT dictionar
y relating de Sitter two-point functions and conformal two-point functions
in the would-be dual CFT.\n\nhttps://conference-indico.kek.jp/event/116/c
ontributions/2491/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2491/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Current Driven Tricritical Point in Large- Nc Gauge Theory
DTSTART;VALUE=DATE-TIME:20201217T054000Z
DTEND;VALUE=DATE-TIME:20201217T060000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2494@conference-indico.kek.jp
DESCRIPTION:Speakers: Shin Nakamura (Chuo U.)\nWe discover a new tricritic
al point realized only in nonequilibrium steady states\, using the AdS/CFT
correspondence. Our system is a (3+1)-dimensional strongly coupled large-
Nc gauge theory. The tricritical point is associated with a chiral symmetr
y breaking under the presence of an electric current and a magnetic field.
The critical exponents agree with those of the Landau theory of equilibri
um phase transitions. This suggests that the presence of a Landau-like phe
nomenological theory behind our nonequilibrium phase transitions.\n\nhttps
://conference-indico.kek.jp/event/116/contributions/2494/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2494/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pole-skipping of scalar and vector fields in hyperbolic space
DTSTART;VALUE=DATE-TIME:20201217T052000Z
DTEND;VALUE=DATE-TIME:20201217T054000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2495@conference-indico.kek.jp
DESCRIPTION:Speakers: Mitsuhiro Nishida (Gwangju Inst. of Sci. and Tech.)\
nMotivated by the recent connection between pole-skipping phenomena of two
point functions and four point out-of-time-order correlators (OTOCs)\, we
study the pole structure of thermal two-point functions in d-dimensional
conformal field theories (CFTs) in hyperbolic space. We derive the pole-sk
ipping points of two-point functions of scalar and vector fields by three
methods (one field theoretic and two holographic methods) and confirm that
they agree. We show that the leading pole-skipping point of two point fun
ctions is related with the late time behavior of conformal blocks and shad
ow conformal blocks in four-point OTOCs.\n\nhttps://conference-indico.kek.
jp/event/116/contributions/2495/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2495/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Curvature perturbation and Anomaly explains dark energy
DTSTART;VALUE=DATE-TIME:20201217T072000Z
DTEND;VALUE=DATE-TIME:20201217T074000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2488@conference-indico.kek.jp
DESCRIPTION:Speakers: Yoshihisa Kitazawa (KEK)\nWe investigate the history
of dark energy to explain the present magnitude. We assume the dark energ
y is the residual cosmological constant. The most important channel in the
reheating process is the gluon pair productions by QCD trace anomaly. We
argue dark energy decays rapidly by gluon pair emissions during the reheat
ing and after the big bang. The reheating temperature is determined by the
decay width of dark energy $\\Gamma$. It is low as $\\sqrt{M_P \\Gamma} \
\sim 10^6$ GeV. It is the consequence of Friedmann's equation and an equil
ibrium condition $\\Gamma \\sim H$. As the Universe cools below the hadron
ic scale\, dark energy density is almost frozen. The density of dark energ
y further decreases by emitting two photons. We have pinned down the curre
nt magnitude of dark energy from Friedmann equation and the QED trace anom
aly in an excellent agreement with the observations.\n\nhttps://conference
-indico.kek.jp/event/116/contributions/2488/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2488/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Islands in Schwarzschild black holes
DTSTART;VALUE=DATE-TIME:20201218T080000Z
DTEND;VALUE=DATE-TIME:20201218T082000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2493@conference-indico.kek.jp
DESCRIPTION:Speakers: Yoshinori Matsuo (Osaka U.)\nWe study the Page curve
for asymptotically flat eternal Schwarzschild black holes in four (or hig
her) spacetime dimensions. Before the Page time\, the entanglement entropy
grows linearly in time. After the Page time\, the entanglement entropy of
a given region outside the black hole is largely modified by the emergenc
e of an island\, which extends to the outer vicinity of the event horizon.
As a result\, it remains a constant value which reproduces the Bekenstein
-Hawking entropy\, consistent with the finiteness of the von Neumann entro
py for an eternal black hole.\n\nhttps://conference-indico.kek.jp/event/11
6/contributions/2493/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2493/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative Tests of Duality Cascades in Three Dimensional Su
persymmetric Gauge Theories
DTSTART;VALUE=DATE-TIME:20201216T082000Z
DTEND;VALUE=DATE-TIME:20201216T084000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2490@conference-indico.kek.jp
DESCRIPTION:Speakers: Naotaka Kubo (YITP)\nIt has been conjectured that du
ality cascade occurs in the N = 3 supersymmetric Yang-Mills Chern-Simons t
heory with the gauge group U(N)*U(N +M) coupled to two bi-fundamental hype
rmultiplets. The brane picture suggests that this duality cascade can be g
eneralized to a class of 3d N = 3 supersymmetric quiver gauge theories com
ing from so-called Hanany-Witten type brane configurations. In this paper
we perform non-perturbative tests of the duality cascades using supersymme
try localization. We focus on S^3 partition functions and prove prediction
s from the duality cascades.\n\nhttps://conference-indico.kek.jp/event/116
/contributions/2490/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2490/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Closing address
DTSTART;VALUE=DATE-TIME:20201218T090000Z
DTEND;VALUE=DATE-TIME:20201218T090500Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2537@conference-indico.kek.jp
DESCRIPTION:Speakers: Takao Suyama (KEK)\nhttps://conference-indico.kek.jp
/event/116/contributions/2537/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2537/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological color-superconductivity in QCD with one flavor
DTSTART;VALUE=DATE-TIME:20201215T064500Z
DTEND;VALUE=DATE-TIME:20201215T070500Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2500@conference-indico.kek.jp
DESCRIPTION:Speakers: Noriyuki Sogabe (KEK and Institute of Modern Physics
)\nSuperconductive gaps have topologically protected nodes if the fermions
form the inter-chiral Cooper pair [1]. We generalize this Li and Haldane'
s argument to the color superconductivity in QCD with one flavor. Among se
veral order parameters with different spins and colors\, we find that the
nodes in the phases with a simple color-spin structure have the vortices c
haracterized by the Berry monopole. On the other hand\, the paring functio
n has no nodes if the color and spin degrees of freedom are entangled\, su
ch as in the so-called color-spin locking phase. Even in this case\, we fi
nd a non-trivial Berry curvature defined by the gap eigenvectors in the co
lor-spin space. We argue that the topological phase transition should occu
r between the trivial low-density hadronic matter and the non-trivial high
-density quark matter with well-defined chirality. Our preliminary results
suggest the breakdown of the quark-hadron continuity scenario in QCD with
one flavor studied earlier by T. Schäfer [2]. [1] Yi Li and F. D. M. Hal
dane\, "Topological nodal Cooper pairing in doped Weyl metals\," Phys. Rev
. Lett. 120\, 067003 (2018). [2] T. Schäfer\, "Quark hadron continuity in
QCD with one flavor\," Phys. Rev. D 62\, 094007 (2000).\n\nhttps://confer
ence-indico.kek.jp/event/116/contributions/2500/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2500/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological term\, QCD anomaly\, and the $\\eta'$ chiral soliton l
attice in rotating baryonic matter
DTSTART;VALUE=DATE-TIME:20201215T070500Z
DTEND;VALUE=DATE-TIME:20201215T072500Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2496@conference-indico.kek.jp
DESCRIPTION:Speakers: Kentaro Nishimura (Keio U.)\nWe study the ground sta
tes of low-density hadronic matter and high-density color-flavor locked co
lor superconducting phase in three-flavor QCD at finite baryon chemical po
tential under rotation. We find that\, in both cases under sufficiently fa
st rotation\, the combination of the rotation-induced topological term for
the η' meson and the QCD anomaly leads to an inhomogeneous condensate of
the $\\eta'$ meson\, known as the chiral soliton lattice (CSL). We find t
hat\, when baryon chemical potential is much larger than isospin chemical
potential\, the critical angular velocity for the realization of the $\\et
a'$ CSL is much smaller than that for the $\\pi_0$ CSL found previously. W
e also argue that the $\\eta'$ CSL states in flavor-symmetric QCD at low d
ensity and high density should be continuously connected\, extending the q
uark-hadron continuity conjecture in the presence of the rotation.\n\nhttp
s://conference-indico.kek.jp/event/116/contributions/2496/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2496/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological Vertex/anti-Vertex and Supergroup Gauge Theory
DTSTART;VALUE=DATE-TIME:20201216T054000Z
DTEND;VALUE=DATE-TIME:20201216T060000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2501@conference-indico.kek.jp
DESCRIPTION:Speakers: Yuji Sugimoto (U. of Sci. and Tech. of China)\nWe pr
opose a new vertex formalism\, called anti-refined topological vertex (ant
i-vertex for short)\, to compute the generalized topological string amplit
ude\, which gives rise to the supergroup gauge theory partition function.
We show the one-to-many correspondence between the gauge theory and the Ca
labi--Yau geometry\, which is peculiar to the supergroup theory\, and the
relation between the ordinary vertex formalism and the vertex/anti-vertex
formalism through the analytic continuation.\n\nhttps://conference-indico.
kek.jp/event/116/contributions/2501/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2501/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Wilson-'t Hooft lines as transfer matrices
DTSTART;VALUE=DATE-TIME:20201216T080000Z
DTEND;VALUE=DATE-TIME:20201216T082000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2497@conference-indico.kek.jp
DESCRIPTION:Speakers: Toshihiro Ota (Osaka U.)\nWe establish a corresponde
nce between a class of Wilson-'t Hooft lines in four-dimensional N=2 super
symmetric gauge theories described by circular quivers and transfer matric
es constructed from dynamical L-operators for trigonometric quantum integr
able systems. We compute the vacuum expectation values of the Wilson-'t Ho
oft lines in a twisted product space S^1xR^3 by supersymmetric localizatio
n and show that they are equal to the Wigner transforms of the transfer ma
trices. A variant of the AGT correspondence implies an identification of t
he transfer matrices with Verlinde operators in Toda theory\, which we als
o verify. We explain how these field theory setups are related to four-dim
ensional Chern--Simons theory via embedding into string theory and dualiti
es.\n\nhttps://conference-indico.kek.jp/event/116/contributions/2497/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2497/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Relativistic fluid dynamics for spin polarization.
DTSTART;VALUE=DATE-TIME:20201217T082000Z
DTEND;VALUE=DATE-TIME:20201217T084000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2499@conference-indico.kek.jp
DESCRIPTION:Speakers: Rajeev Singh (Inst. of Nucl. Phys. Polish Academy o
f Sciences)\nMeasurements made recently by the STAR collaboration show tha
t the Lambda hyperons produced in relativistic heavy-ion collisions are su
bject to global spin polarization with respect to an axis coincident with
the axis of rotation of the produced matter. Recently formulated formalism
of relativistic hydrodynamics with spin\, which is a generalization of th
e standard hydrodynamics\, is a natural tool for describing the evolution
of such systems. This approach is based on the conservation laws and the f
orm of the energy-momentum tensor and spin tensor postulated by de Groot\,
van Leeuwen\, and van Weert (GLW). Using Bjorken symmetry we show how thi
s formalism may be used to determine observables describing the polarizati
on of particles measured in the experiment.\n\nhttps://conference-indico.k
ek.jp/event/116/contributions/2499/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2499/
END:VEVENT
BEGIN:VEVENT
SUMMARY:KdV-charged black holes
DTSTART;VALUE=DATE-TIME:20201218T084000Z
DTEND;VALUE=DATE-TIME:20201218T090000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2502@conference-indico.kek.jp
DESCRIPTION:Speakers: Sotaro Sugishita (KEK)\nWe construct black hole geom
etries in 3d AdS with non-trivial values of KdV charges. The black holes a
re saddle points of the free energy that is holographically dual to that o
f the generalized Gibbs ensemble containing the chemical potentials of qua
ntum KdV charges in 2d CFT. The introduction of the chemical potentials me
ans the deformation of the boundary Hamiltonian which results in the chang
es of the boundary conditions in the gravity side. We show that new geomet
ries\, not the conventional BTZ ones\, can be the leading saddles for a ce
rtain value of chemical potentials.\n\nhttps://conference-indico.kek.jp/ev
ent/116/contributions/2502/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2502/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entanglement entropy in interacting field theories
DTSTART;VALUE=DATE-TIME:20201216T050000Z
DTEND;VALUE=DATE-TIME:20201216T052000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2498@conference-indico.kek.jp
DESCRIPTION:Speakers: Katsuta Sakai (KEK)\nEntanglement entropy (EE) is a
useful quantity to measure quantum correlation between separated systems.
There has been accumulating progress in the analysis on it\, especially in
the case of free theories and CFTs. On the other hand\, we have relativel
y little understanding on EE in general interacting field theories. In th
is work\, we propose a general method for calculating such EE by combining
2PI formalism and orbifold method\, the latter of which is some variation
of replica method. We show that we can write down the EE in terms of exac
t propagator\, which suggest the method is applicable to theories with lar
ge radiative correction in the 2-point function.\n\nhttps://conference-ind
ico.kek.jp/event/116/contributions/2498/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2498/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higher groups and topological phases of matter
DTSTART;VALUE=DATE-TIME:20201215T080000Z
DTEND;VALUE=DATE-TIME:20201215T083000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2521@conference-indico.kek.jp
DESCRIPTION:Speakers: Apoorv Tiwari (U. of Zurich)\nI will describe how sy
mmetry structures appearing in quantum many-body systems can be understood
within the framework of fusion categories. Quantum systems with ``higher
symmetry" structures naturally appear by generalising or weakening certain
axioms of these fusion categories. I will touch upon various topological
aspects of higher group symmetries such as symmetry protected topological
phases\, anomalies and topological gauge theories.\n\nhttps://conference-i
ndico.kek.jp/event/116/contributions/2521/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2521/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Equivalence Principle\, Decoupling Principle\, and Information Los
s Paradox
DTSTART;VALUE=DATE-TIME:20201218T000000Z
DTEND;VALUE=DATE-TIME:20201218T010000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2507@conference-indico.kek.jp
DESCRIPTION:Speakers: Pei-Ming Ho (NTU)\nWe review the origin and basics o
f the black-hole information loss paradox\, and comment on some of its pot
ential resolutions.\n\nhttps://conference-indico.kek.jp/event/116/contribu
tions/2507/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2507/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Color superconductivity in lattice QCD
DTSTART;VALUE=DATE-TIME:20201216T022000Z
DTEND;VALUE=DATE-TIME:20201216T030000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2516@conference-indico.kek.jp
DESCRIPTION:Speakers: Jun Nishimura (KEK)\nExploring the QCD phase diagram
is known to be extremely difficult at finite density due to the sign prob
lem\, which occurs in lattice QCD calculations. We show that this problem
can be overcome by the complex Langevin method in a certain parameter regi
on at low temperature and high density. This\, in particular\, gives us a
hope to investigate color superconductivity in lattice QCD by first princi
ple calculations. I will discuss the existence of a new phase with a quark
-quark condensate based on the gap equation in the perturbative regime\, a
nd show some results of the complex Langevin method\, which turn out to be
consistent with this prediction.\n\nhttps://conference-indico.kek.jp/even
t/116/contributions/2516/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2516/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Introduction to higher form symmetries
DTSTART;VALUE=DATE-TIME:20201215T000500Z
DTEND;VALUE=DATE-TIME:20201215T013500Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2517@conference-indico.kek.jp
DESCRIPTION:Speakers: Yoshimasa Hidaka (KEK)\nI will review a basic notion
of higher form symmetries\, which are symmetries for extended objects suc
h as vortices\, and domain walls. As an application\, we discuss spontaneo
us symmetry breaking of higher form symmetries\, topological order\, and s
ymmetry-protected topological phases of matter.\n\nhttps://conference-indi
co.kek.jp/event/116/contributions/2517/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2517/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exploring the QCD phase diagram with holographic models
DTSTART;VALUE=DATE-TIME:20201216T012000Z
DTEND;VALUE=DATE-TIME:20201216T020000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2515@conference-indico.kek.jp
DESCRIPTION:Speakers: Kouji Kashiwa (Fukuoka Inst. of Tech.)\nIn this talk
\, I will explain the recent progress of understanding the QCD phase diagr
am based on the holographic models. Particularly\, this talk concentrates
on the treatment of the color superconductivity and the application of the
imaginary chemical potential in the bottom-up approach. In addition\, I w
ill explain what interesting phenomena will be discussed via the bottom-up
holographic models.\n\nhttps://conference-indico.kek.jp/event/116/contrib
utions/2515/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2515/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin analysis of four-dimensional SU(2) gauge theory w
ith a theta term
DTSTART;VALUE=DATE-TIME:20201216T080000Z
DTEND;VALUE=DATE-TIME:20201216T082000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2506@conference-indico.kek.jp
DESCRIPTION:Speakers: Atis Yosprakob (SOKENDAI)\nGauge theory with a theta
term has recently been of great interest\, especially at $\\theta=\\pi$\,
where nontrivial phase structure is expected from the 't Hooft anomaly ma
tching condition. However\, it is difficult to study the theory numericall
y due to the severe sign problem. We try to overcome this by using the com
plex Langevin method. In our previous work\, we apply the technique to the
2d U(1) gauge theory. We were able to reproduce the exact result by intro
ducing a puncture on the torus. We also show that the effect of the punctu
re disappears in the infinite volume limit in the region $|\\theta|\n\nhtt
ps://conference-indico.kek.jp/event/116/contributions/2506/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2506/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Partial Deconfinement at Strong Coupling on the Lattice
DTSTART;VALUE=DATE-TIME:20201216T082000Z
DTEND;VALUE=DATE-TIME:20201216T084000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2504@conference-indico.kek.jp
DESCRIPTION:Speakers: Hiromasa Watanabe (U. of Tsukuba)\nPartial deconfine
ment is proposed in the context of the deconfinement transition for the la
rge N gauge theories\, as the coexisting phenomenon of the confined and de
confined sectors in the space of color degrees of freedom. It is well-esta
blished analytically for weakly-coupled theories\, while it remains unclea
r whether the above picture is valid at strong coupling. We provide some e
vidence for the above situation using lattice Monte Carlo simulations of t
wo bosonic matrix models.\n\nhttps://conference-indico.kek.jp/event/116/co
ntributions/2504/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2504/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic Moving Mirror and Page Curve
DTSTART;VALUE=DATE-TIME:20201218T082000Z
DTEND;VALUE=DATE-TIME:20201218T084000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2505@conference-indico.kek.jp
DESCRIPTION:Speakers: Zixia Wei (YITP)\nIn this talk\, we discuss moving m
irror setups in CFT and their gravity duals. We derive the page curve from
gravity duals. An intriguing relation between moving mirror in CFT and Ha
wking radiation from a black hole will be discussed using double holograph
y explored in our previous work 2007.06800. This work is based on the coll
aborations with Ibrahim Akal\, Yuya Kusuki\, Noburo Shiba and Tadashi Taka
yanagi. This talk is based on arXiv:2007.06800 and a work in preparation.\
n\nhttps://conference-indico.kek.jp/event/116/contributions/2505/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2505/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Symmetry protected topological phases and generalized (co)homology
theory
DTSTART;VALUE=DATE-TIME:20201215T015000Z
DTEND;VALUE=DATE-TIME:20201215T032000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2519@conference-indico.kek.jp
DESCRIPTION:Speakers: Ken Shiozaki (YITP)\nIt is discussed that the symmet
ry protected topological phase (SPT phase) is well described by generalize
d cohomology theory. Identifying the classification of SPT phases on a rea
l-space manifold $X$ as a homology group on $X$ offers a unified understan
ding of SPT phenomena through the axioms and general properties of the gen
eralized (co)homology. In this talk\, I will give a brief review of how th
e mathematical structure of generalized (co)homology theory can help us to
consider SPT phases and quantum anomalies.\n\nhttps://conference-indico.k
ek.jp/event/116/contributions/2519/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2519/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Universes as Bigdata: from Geometry\, to Physics\, to Machine-Lea
rning
DTSTART;VALUE=DATE-TIME:20201217T000000Z
DTEND;VALUE=DATE-TIME:20201217T010000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2511@conference-indico.kek.jp
DESCRIPTION:Speakers: Yang-Hui He (Merton Coll.\, U. of Oxford)\nWe briefl
y overview how historically string theory led theoretical physics first to
algebraic/differential geometry\, and then to computational geometry\, an
d now to data science. \nUsing the Calabi-Yau landscape - accumulated by t
he collaboration of physicists\, mathematicians and computer scientists ov
er the last 4 decades - as a starting-point and concrete playground\, we t
hen launch to review our recent programme in machine-learning mathematical
structures and address the tantalizing question of how AI helps doing mat
hematics\, ranging from geometry\, to representation theory\, to combinato
rics\, to number theory.\n\nhttps://conference-indico.kek.jp/event/116/con
tributions/2511/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2511/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dense QCD matter tackled by experiments\, observations\, and theor
y
DTSTART;VALUE=DATE-TIME:20201216T000000Z
DTEND;VALUE=DATE-TIME:20201216T010000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2514@conference-indico.kek.jp
DESCRIPTION:Speakers: Akira Ohnishi (YITP)\nDense QCD matter appears in co
mpact astrophysical phenomena and heavy-ion collisions. Phenomenological E
OS (equation of state) needs extrapolation or interpolation and has large
uncertainty. Thus we need first-principles or model-independent theoretica
l studies\, or experiments where dense QCD matter is directly probed. In t
his talk\, I first review physics of finite density QCD from the viewpoint
s of experiments\, astronomical observations\, and phenomenology. Next I w
ill discuss several theoretical developments in approaches toward solving
the sign problem\, topological order arguments\, and transport model appro
aches\, which may reduce the EOS uncertainty and elucidate the neutron sta
r interior.\n\nhttps://conference-indico.kek.jp/event/116/contributions/25
14/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2514/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Implications of the weak gravity conjecture in anomalous quiver ga
uge theories
DTSTART;VALUE=DATE-TIME:20201217T062000Z
DTEND;VALUE=DATE-TIME:20201217T064000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2481@conference-indico.kek.jp
DESCRIPTION:Speakers: Tetsutaro Higaki (Keio U.)\nWe argue a smallness of
gauge couplings in abelian quiver gauge theories\, taking the anomaly canc
ellation condition into account. In theories of our interest there exist c
hiral fermions leading to chiral gauge anomalies\, and an anomaly-free gau
ge coupling tends to be small\, and hence can give a non trivial condition
of the weak gravity conjecture. As concrete examples\, we consider U(1)^{
k} gauge theories with a discrete symmetry associated with cyclic permutat
ions between the gauge groups\, and identify anomaly-free U(1) gauge symme
tries and the corresponding gauge couplings. Owing to this discrete symmet
ry\, we can systematically study the models and we find that the models wo
uld be examples of the weak coupling conjecture. It is conjectured that a
certain class of chiral gauge theories with too many U(1) symmetries may b
e in the swampland. We also numerically study constraints on the couplings
from the scalar weak gravity conjecture in a concrete model. These constr
aints may have a phenomenological implication to model building of a chira
l hidden sector as well as the visible sector.\n\nhttps://conference-indic
o.kek.jp/event/116/contributions/2481/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2481/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Applications of the twisted boson theory and linear response theor
y to XXZ chain
DTSTART;VALUE=DATE-TIME:20201217T084000Z
DTEND;VALUE=DATE-TIME:20201217T090000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2523@conference-indico.kek.jp
DESCRIPTION:Speakers: Yoshiki Fukusumi (Zagreb U.)\nIn this talk\, I intro
duce two different approaches to treat the XXZ Heisenberg chain with twist
ed boundary conditions. One is the linear response theory\, which treats t
he twists as a perturbation. The other is the twisted boson theory\, which
treats irrelevant terms as a perturbation after considering the effects o
f the twists. Surprisingly\, these two formalisms cannot make the same res
ults. We reveal the reason for this mismatch and demonstrate related probl
ems which are significant when considering fundamental aspects of equilibr
ium and nonequilibrium physics.\n\nhttps://conference-indico.kek.jp/event/
116/contributions/2523/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2523/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higher-form symmetries and 3-group in axion electrodynamics
DTSTART;VALUE=DATE-TIME:20201215T053000Z
DTEND;VALUE=DATE-TIME:20201215T063000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2520@conference-indico.kek.jp
DESCRIPTION:Speakers: Ryo Yokokura (KEK)\nWe study higher-form symmetries
in a low-energy effective theory of a massless axion coupled with a photon
in $(3+1)$ dimensions. It is shown that the higher-form symmetries of thi
s system are accompanied by a semistrict 3-group (2-crossed module) struct
ure\, which can be found by the correlation functions of symmetry generato
rs of the higher-form symmetries. We argue that the Witten effect and anom
alous Hall effect in the axion electrodynamics can be described in terms o
f 3-group transformations.\n\nhttps://conference-indico.kek.jp/event/116/c
ontributions/2520/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2520/
END:VEVENT
BEGIN:VEVENT
SUMMARY:What microstate geometries tell us
DTSTART;VALUE=DATE-TIME:20201218T063000Z
DTEND;VALUE=DATE-TIME:20201218T073000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2539@conference-indico.kek.jp
DESCRIPTION:Speakers: Masaki Shigemori (Nagoya U. & YITP)\nMicrostate geom
etries are smooth horizonless geometries that have the same mass and charg
e as a black hole. In this talk\, I will review the current status of the
research in microstate geometries\, such as their construction\, counting
and lifting\, and discuss their physical implications\, such as evolution
toward more typical microstates.\n\nhttps://conference-indico.kek.jp/event
/116/contributions/2539/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2539/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Instatons and Berry’s connections on quantum graph
DTSTART;VALUE=DATE-TIME:20201216T062000Z
DTEND;VALUE=DATE-TIME:20201216T064000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2503@conference-indico.kek.jp
DESCRIPTION:Speakers: Inori Ueba (Kobe U.)\nWe discuss topological propert
ies of boundary conditions on a quantum graph from the viewpoint of the Be
rry’s connections. The quantum graph is known as a quantum mechanical sy
stem on a one dimensional graph which consists of edges and vertices conne
cted with each other\, and boundary conditions are imposed on each vertex.
This graph is applied to the various research areas\, e.g.\, scattering t
heory\, nanotechnology\, and also an extra dimensional model which can qua
litatively explain the fermion generations\, mass hierarchy\, CP phase in
the standard model\, and the boundary conditions play important roles in e
ach case. In this talk\, we will reveal the structure of the boundary cond
itions and show that configuration of the instantons appear as the Berry
’s connections on a parameter space of them.\n\nhttps://conference-indic
o.kek.jp/event/116/contributions/2503/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2503/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-simply laced Lie groups and half-hypermultiplets in F-theory
DTSTART;VALUE=DATE-TIME:20201216T064000Z
DTEND;VALUE=DATE-TIME:20201216T070000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2524@conference-indico.kek.jp
DESCRIPTION:Speakers: Rinto Kuramochi (SOKENDAI)\nIn six-dimensional F-the
ory/Heterotic string theory\, half-hypermultiplets arise only when they co
rrespond to particular quaternionic Kähler symmetric spaces\, which are m
ostly associated with the Freudenthal-Tits magic square. Motivated by the
intriguing singularity structure previously found in such F-theory models
with a gauge group SU(6)\, SO(12) or E_7\, we investigate\, as the final m
agical example\, an F-theory on an elliptic fibration over a Hirzebruch su
rface of the non-split I_6 type\, in which the unbroken gauge symmetry is
supposed to be Sp(3). Rather unexpectedly\, we find significant qualitativ
e differences between the previous F-theory models associated with the mag
ic square and the present case.\n\nhttps://conference-indico.kek.jp/event/
116/contributions/2524/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2524/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Superconformal index of the 6d (2\,0) theory via the AdS/CFT corre
spondence
DTSTART;VALUE=DATE-TIME:20201216T084000Z
DTEND;VALUE=DATE-TIME:20201216T090000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2522@conference-indico.kek.jp
DESCRIPTION:Speakers: Shota Fujiwara (Tokyo Inst. of Tech.)\nWe study the
superconformal index of the 6d (2\,0) theory by using the AdS/CFT correspo
ndence. It is well known that on the gravity side at the large N limit\, t
he index can be calculated from the contribution of the Kaluza Klein modes
. For the AdS_5/CFT_4 cases\, recent works show that in addition to Kaluza
Klein modes\, D3-branes wrapped on the compact space contribute to the in
dex at the finite N region. In this talk we apply this method to M-theory
on AdS_7×S^4 and propose the superconformal index of the 6d (2\,0) theory
. Namely\, we calculate the index of the 6d (2\,0) theory from dual gravit
y side at finite N by considering the M2-branes wrapped on compact space S
^4. We also discuss the validity of the results obtained from our proposin
g formula.\n\nhttps://conference-indico.kek.jp/event/116/contributions/252
2/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2522/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entanglement between two disjoint universes
DTSTART;VALUE=DATE-TIME:20201218T050000Z
DTEND;VALUE=DATE-TIME:20201218T060000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2509@conference-indico.kek.jp
DESCRIPTION:Speakers: Tomonori Ugajin (YITP)\nWe use the replica method to
compute the entanglement entropy of a universe without gravity entangled
in a thermofield-double-like state with a disjoint gravitating universe. I
ncluding wormholes between replicas of the latter gives an entropy functio
nal which includes an "island" on the gravitating universe. We solve the b
ack-reaction equations when the cosmological constant is negative to show
that this island coincides with a causal shadow region that is created by
the entanglement in the gravitating geometry. At high entanglement tempera
tures\, the island contribution to the entropy functional leads to a bound
on entanglement entropy\, analogous to the Page behavior of evaporating b
lack holes. We also apply the formalism to black holes in de Sitter space\
, and find similar islands.\n\nhttps://conference-indico.kek.jp/event/116/
contributions/2509/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2509/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black hole as a quantum field configuration
DTSTART;VALUE=DATE-TIME:20201218T013000Z
DTEND;VALUE=DATE-TIME:20201218T023000Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2508@conference-indico.kek.jp
DESCRIPTION:Speakers: Yuki Yokokura (iTHEMS\, RIKEN)\nIn quantum theory\,
black holes evaporate. We adopt this property as the 0th approximation and
provide a field-theoretic description of black holes. To do that\, we ana
lyze time evolution of a spherical collapsing matter together with the bac
k reaction of (pre)Hawking radiation by solving the semi-classical Einstei
n eq coupled with N massless scalar quantum fields. We find a 4D self-cons
istent non-perturbative solution w.r.t. $\\hbar$. It describes the most pa
rt of the black hole in the semi-classical level while it connects the sem
i-classical region to the quantum gravity region smoothly. [arxiv:2002.103
31]\n\nhttps://conference-indico.kek.jp/event/116/contributions/2508/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2508/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hidden structures in the landscape of heterotic line bundle models
DTSTART;VALUE=DATE-TIME:20201217T023000Z
DTEND;VALUE=DATE-TIME:20201217T031500Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2513@conference-indico.kek.jp
DESCRIPTION:Speakers: Hajime Otsuka (KEK)\nWe show that neural networks ca
n detect hidden structures in the string landscape\, in particular\, heter
otic string theory on Calabi-Yau threefolds with line bundles. It turns ou
t that three-generation models cluster in particular islands specified by
deep autoencoder networks and k-means++ clustering.\nEspecially\, we explo
re mutual relations between model parameters and the cluster with densest
three-generation models (called ``3-generation island"). We find that the
3-generation island has a strong correlation with the topological data of
Calabi-Yau threefolds\, namely\, second Chern class of the tangent bundle
of the Calabi-Yau threefolds.\nReference: arXiv:2003.11880 [hep-th]\n\nhtt
ps://conference-indico.kek.jp/event/116/contributions/2513/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2513/
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SUMMARY:The Topology of Data: from String Theory to Cosmology to Phases of
Matter
DTSTART;VALUE=DATE-TIME:20201217T011500Z
DTEND;VALUE=DATE-TIME:20201217T021500Z
DTSTAMP;VALUE=DATE-TIME:20221001T135440Z
UID:indico-contribution-116-2512@conference-indico.kek.jp
DESCRIPTION:Speakers: Gary Shiu (U. of Wisconsin-Madison)\nWe are faced wi
th an explosion of data in many areas of physics\, but very so often\, it
is not the size but the complexity of the data that makes extracting physi
cs from big datasets challenging. As I will discuss in this talk\, data ha
s shape and the shape of data encodes the underlying physics. Persistent h
omology is a tool in computational topology developed for quantifying the
shape of data. I will discuss three applications of topological data analy
sis: 1) identifying structure of the string landscape\, 2) constraining pr
imordial non-Gaussianity from CMB measurements and large scale structures
data\, and 3) detecting and classifying phases of matter. Persistent homol
ogy condenses these datasets into their most relevant (and interpretable)
features\, so that simple statistical pipelines are sufficient in these co
ntexts. This suggests that TDA can be used in conjunction with machine lea
rning algorithms and improves their architecture.\nBased on https://arxiv.
org/abs/2009.14231\, https://arxiv.org/abs/2009.04819\, https://arxiv.org/
abs/1907.10072\, https://arxiv.org/abs/1812.06960\, https://arxiv.org/abs/
1712.08159.\n\nhttps://conference-indico.kek.jp/event/116/contributions/25
12/
LOCATION:Online (Zoom)
URL:https://conference-indico.kek.jp/event/116/contributions/2512/
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