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BEGIN:VEVENT
SUMMARY:Kantaro Ohmori (Simons Center for Geometry and Physics)
DTSTART:20200515T030000Z
DTEND:20200515T040000Z
DTSTAMP:20260404T110914Z
UID:EASW/1
DESCRIPTION:Title: 1+1d adjoint QCD and non-invertible topological lines\nby Kantaro
Ohmori (Simons Center for Geometry and Physics) as part of East Asian Stri
ng Webinars\n\n\nAbstract\nIn ‘90s\, it is claimed that the QCD with mas
sless adjoint quark in 1+1-dimensions is confined\, although naively the f
ermions cannot screen the Wilson line in the fundamental representation. I
n this talk\, we will see that the confinement can be explained from the t
opological line operators live in the theory. In particular\, non-invertib
le topological lines\, which do not correspond to a symmetry\, play a cruc
ial role. Based on a ongoing work with Zohar Komargodski\, Konstantinos Ro
umpedakis and Sahand Seifnashri.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chang-Tse Hsieh (Kavli IPMU)
DTSTART:20200529T030000Z
DTEND:20200529T040000Z
DTSTAMP:20260404T110914Z
UID:EASW/2
DESCRIPTION:Title: Anomaly of the electromagnetic duality of Maxwell theory\nby Chang
-Tse Hsieh (Kavli IPMU) as part of East Asian String Webinars\n\n\nAbstrac
t\nEvery physicist knows that the classical electromagnetism is described
by Maxwell's equations and that it is invariant under the electromagnetic
duality S: (E\, B) → (B\, −E). However\, the properties of the electro
magnetic duality in the quantum theory might not be as well known to physi
cists and are in fact not very well understood in the literature. Recently
\, we uncovered a feature of Maxwell theory in the situation where going a
round nontrivial paths in the spacetime involves the action of the duality
transformation\, namely that it has a quantum anomaly. We found that the
anomaly of this system in a particular formulation is 56 times that of a W
eyl fermion. Our result reproduces\, as a special case\, the known anomaly
of the all-fermion electrodynamics — a version of the Maxwell theory wh
ere particles of odd (electric or magnetic) charge are fermions — discov
ered in the last few years.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Miranda Cheng (Univ. of Amsterdam/National Taiwan University)
DTSTART:20200612T030000Z
DTEND:20200612T040000Z
DTSTAMP:20260404T110914Z
UID:EASW/3
DESCRIPTION:Title: Quantum Modularity from 3-Manifolds\nby Miranda Cheng (Univ. of Am
sterdam/National Taiwan University) as part of East Asian String Webinars\
n\n\nAbstract\nQuantum modular forms are functions on rational numbers tha
t have rather mysterious weak modular properties. Mock modular forms and f
alse theta functions are examples of holomorphic functions on the upper-ha
lf plane which lead to quantum modular forms. Inspired by the 3d-3d corres
pondence in string theory\, a new topological invariants named homological
blocks for (in particular plumbed) three-manifolds have been proposed a f
ew years ago. My talk aims to explain the recent observations on the quant
um modular properties of the homological blocks\, as well as the relation
to logarithmic vertex algebras. The talk will be based on a series of work
in collaboration with Sungbong Chun\, Boris Feigin\, Francesca Ferrari\,
Sergei Gukov\, Sarah Harrison\, and Gabriele Sgroi.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:João Penedones (École Polytechnique Fédérale de Lausanne)
DTSTART:20200626T080000Z
DTEND:20200626T090000Z
DTSTAMP:20260404T110914Z
UID:EASW/4
DESCRIPTION:Title: Nonperturbative Mellin Amplitudes\nby João Penedones (École Poly
technique Fédérale de Lausanne) as part of East Asian String Webinars\n\
n\nAbstract\nI will argue that nonperturbative CFT correlation functions a
dmit a Mellin amplitude representation. I will discuss the main properties
of Mellin amplitudes: subtractions\, analyticity\, unitarity\, Polyakov c
onditions and polynomial boundedness at infinity. These can be used to wri
te dispersion relations for Mellin amplitudes. Combining crossing\, disper
sion relations and Polyakov conditions I will write down a set of (extrema
l) functionals that act on the OPE data.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Tong (University of Cambridge)
DTSTART:20200710T080000Z
DTEND:20200710T090000Z
DTSTAMP:20260404T110914Z
UID:EASW/5
DESCRIPTION:Title: Boundary conditions for chiral Fermions\nby David Tong (University
of Cambridge) as part of East Asian String Webinars\n\n\nAbstract\nI will
describe boundary conditions for fermions in d=1+1 dimensions\, using the
framework of boundary conformal field theory. I will explain how boundary
states are classified by a mod 2 index\, related to their SPT phase\, des
cribe how one can follow RG flows from one boundary state to another\, and
give a novel perspective on the Z_8 classification of d=2+1 SPT phases.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Xiangyu Cao (UC Berkeley)
DTSTART:20200724T030000Z
DTEND:20200724T040000Z
DTSTAMP:20260404T110914Z
UID:EASW/6
DESCRIPTION:Title: Scrambling vs chaos\nby Xiangyu Cao (UC Berkeley) as part of East
Asian String Webinars\n\n\nAbstract\nHow to characterize information scram
bling in dynamical systems is a question of interest to physicists across
energy scales. Inspired by classical chaos\, which addresses this question
quite successfully in classical physics\, out of order time correlators (
OTOC) have been considered a promising approach for quantum systems. In th
is talk\, I will first discuss the relation between scrambling (as defined
by exponential growth of OTOC) and chaos in the semiclassical regime\, an
d show that they can differ qualitatively (joint work with Tianrui Xu andT
homas Scaffidi). In a second part\, I will discuss scrambling in a family
of generalized Sachdev-Ye-Kitaev models\, which are arguably more realisti
c\, and which allow us to clarify the behavior of the Lyapunov exponent in
non-maxically chaotic Fermi and non-Fermi liquids (joint work with Jaewon
Kim and Ehud Altman).\n
LOCATION:https://stable.researchseminars.org/talk/EASW/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Julian Sonner (U. Geneva)
DTSTART:20200807T080000Z
DTEND:20200807T090000Z
DTSTAMP:20260404T110914Z
UID:EASW/7
DESCRIPTION:Title: Causal symmetry breaking: late time physics of holographic quantum cha
os\nby Julian Sonner (U. Geneva) as part of East Asian String Webinars
\n\n\nAbstract\nQuantum chaotic systems are often defined via the assertio
n that their spectral statistics coincides with\, or is well approximated
by\, random matrix theory. In this talk I will explain how the universal c
ontent of random matrix theory emerges as the consequence of a simple symm
etry-breaking principle and its associated Goldstone modes. Within AdS/CFT
this gives a universal framework to express correlations between "differe
nt universes"\, even for individual theories rather than ensembles. I will
illustrate the bulk picture of this EFT using the example minimal string
theory. I will end by discussing the construction of the EFT of quantum ch
aos also in higher dimensional field theories\, as applicable for example
for higher-dimensional AdS/CFT dual pairs.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Richard A. Davison (Herriot-Watt U.)
DTSTART:20200821T080000Z
DTEND:20200821T090000Z
DTSTAMP:20260404T110914Z
UID:EASW/8
DESCRIPTION:Title: Relations between transport and chaos in holographic theories\nby
Richard A. Davison (Herriot-Watt U.) as part of East Asian String Webinars
\n\n\nAbstract\nI will describe recent work illustrating general relations
between the transport properties and chaotic properties of quantum field
theories with holographic duals. I will firstly show how a simple analysis
of near-horizon dynamics yields exact constraints on the spectrum of coll
ective excitations. I will then describe how this can be exploited to iden
tify a universal feature in the spectrum\, and its implications for the co
llective transport properties of strongly interacting field theories with
gravity duals.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yang Zhou (Fudan Univ.)
DTSTART:20200904T030000Z
DTEND:20200904T040000Z
DTSTAMP:20260404T110914Z
UID:EASW/9
DESCRIPTION:Title: Reflected entropy for an evaporating black hole\nby Yang Zhou (Fud
an Univ.) as part of East Asian String Webinars\n\n\nAbstract\nBlack hole
information paradox is a problem over 40 years. Recent progress shows hint
towards a new understanding of the black hole interior as part of the Haw
king radiation\, which they called island. In particular the island formul
a for the Von Neumann entropy of Hawking radiation is consistent with unit
arity. In this talk I will discuss how to extract more information of the
island by computing the correlation in Hawking radiation. In particular we
study reflected entropy (as a correlation measure of mixed states) and pr
opose a quantum extremal surface for reflected entropy. Based on that\, we
find a formula for reflected entropy with island cross section as its are
a term in gravitational system.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yang-Hui He (University of Oxford)
DTSTART:20200918T080000Z
DTEND:20200918T090000Z
DTSTAMP:20260404T110914Z
UID:EASW/10
DESCRIPTION:Title: Universes as Bigdata: Superstrings\, Calabi-Yau Manifolds and Machin
e-Learning\nby Yang-Hui He (University of Oxford) as part of East Asia
n String Webinars\n\n\nAbstract\nWe review how historically the problem of
string phenomenology lead theoretical physics first to algebraic/diffenre
tial geometry\, and then to computational geometry\, and now to data scien
ce and AI.\nWith the concrete playground of the Calabi-Yau landscape\, acc
umulated by the collaboration of physicists\, mathematicians and computer
scientists over the last 4 decades\, we show how the latest techniques in
machine-learning can help explore problems of physical and mathematical in
terest.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Baumann (Univ. of Amsterdam)
DTSTART:20200417T030000Z
DTEND:20200417T040000Z
DTSTAMP:20260404T110914Z
UID:EASW/11
DESCRIPTION:Title: The Cosmological Bootstrap\nby Daniel Baumann (Univ. of Amsterdam
) as part of East Asian String Webinars\n\n\nAbstract\nThe past decade has
seen an explosion of progress in our understanding of scattering amplitud
es in gauge theory and gravity. New bootstrap methods have revealed hidden
symmetries and new mathematical structures that are completely invisible
in the standard approach of Lagrangians and Feynman diagrams. Inspired by
these developments\, the bootstrap philosophy has recently been applied to
cosmology. In this talk\, I will describe our work on the bootstrapping o
f cosmological correlations. \n\nThe talk will have two parts: In the firs
t part\, I will describe the conceptual foundations of the "cosmological b
ootstrap” as developed together with Arkani-Hamed\, Lee and Pimentel in
[arXiv:1811.00024]. In the second part\, I will describe the extension of
these ideas to massless particles with spin\, where locality provides impo
rtant new constraints. This is work to appear with Duaso Pueyo\, Joyce\, L
ee and Pimentel.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tadashi Takayanagi (Yukawa Institute for Theoretical Physics\, Kyo
to University)
DTSTART:20200501T030000Z
DTEND:20200501T040000Z
DTSTAMP:20260404T110914Z
UID:EASW/12
DESCRIPTION:Title: Holographic Pseudo Entropy\nby Tadashi Takayanagi (Yukawa Institu
te for Theoretical Physics\, Kyoto University) as part of East Asian Strin
g Webinars\n\n\nAbstract\nIn this talk\, we will study a generalization of
holographic entanglement entropy. This quantity is defined by a mininal a
rea surface in an asymptotically AdS space with Euclidean time-dependence.
We will give its CFT counterpart\, which we call pseudo entropy. We will
also provide quantum information theoretic interpretations of this quantit
y in several specific examples of qubit systems\, which help us to underst
and our results of pseudo entropy in CFTs and gravity duals.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Justin Kaidi (Simons Center\, Stony Brook)
DTSTART:20201204T030000Z
DTEND:20201204T040000Z
DTSTAMP:20260404T110914Z
UID:EASW/13
DESCRIPTION:Title: Adventures in Non-Supersymmetric String Theory\nby Justin Kaidi (
Simons Center\, Stony Brook) as part of East Asian String Webinars\n\n\nAb
stract\nIt has long been known that there exist strings with supersymmetry
on the world sheet\, but not in spacetime. These include the well-known T
ype 0 strings\, as well as a series of seven heterotic strings\, all of wh
ich are obtained by imposing unconventional GSO projections. Besides these
classic examples though\, relatively little is known about the full space
of non-SUSY theories. One of the reasons why non-SUSY strings have remain
ed understudied is the fact that nearly all of them have closed string tac
hyons\, and hence do not admit ten-dimensional flat space as a stable vacu
um. The goal of this talk is two-fold. First\, using recent advances in co
ndensed matter theory\, we will reinterpret GSO projections in terms of to
pological phases of matter\, thereby providing a framework for the classif
ication of non-SUSY strings. Having done so\, we will show that for all no
n-SUSY theories in which a tachyon exists\, it can be condensed to give a
stable lower-dimensional vacuum. In many cases\, these stable vacua will b
e two-dimensional string theories already known in the literature.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Po-Shen Hsin (Caltech)
DTSTART:20201218T030000Z
DTEND:20201218T040000Z
DTSTAMP:20260404T110914Z
UID:EASW/14
DESCRIPTION:Title: Applications of Berry phase in quantum field theory\nby Po-Shen H
sin (Caltech) as part of East Asian String Webinars\n\n\nAbstract\nWe will
discuss Berry phase in family of quantum field theories and its implicati
on to the low energy physics. The family is labelled by parameters which w
e promote to be spacetime-dependent background fields\, and the Berry phas
e is equivalent to topological term of the parameters in the effective act
ion. We use Berry phase to study diabolic points in the phase diagram and
discuss applications including deconfined quantum criticality in 2+1d and
new tests for boson/fermion dualities.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yuya Kusuki (Yukawa Institute\, Kyoto Univ.)
DTSTART:20210129T030000Z
DTEND:20210129T040000Z
DTSTAMP:20260404T110914Z
UID:EASW/15
DESCRIPTION:Title: Codimension two holography as generalization of AdS/CFT\nby Yuya
Kusuki (Yukawa Institute\, Kyoto Univ.) as part of East Asian String Webin
ars\n\n\nAbstract\nI will describe a recent work about a new duality betwe
en D+1 dimensional AdS space and D-1 dimensional CFT\, so-called the “co
dimension two holography”. I will show how we can realize this new \nhol
ography and show a good deal of evidence of this conjecture by performing
explicit computations of physical quantities from both sides.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Geoff Penington (UC Berkeley)
DTSTART:20210212T040000Z
DTEND:20210212T050000Z
DTSTAMP:20260404T110914Z
UID:EASW/16
DESCRIPTION:Title: Entanglement wedge reconstruction and the Petz map\nby Geoff Peni
ngton (UC Berkeley) as part of East Asian String Webinars\n\n\nAbstract\nI
will introduce the Petz map and describe how it can be used in quantum gr
avity to implement entanglement wedge reconstruction. In particular\, I wi
ll focus on the example of reconstruction the interior of a black hole fro
m its Hawking radiation.\n\nNote the unusual starting time!\n
LOCATION:https://stable.researchseminars.org/talk/EASW/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dalimil Mazáč (Institute of Advanced Study\, Princeton)
DTSTART:20210326T030000Z
DTEND:20210326T040000Z
DTSTAMP:20260404T110914Z
UID:EASW/17
DESCRIPTION:Title: Sharp Boundaries for the Swampland\nby Dalimil Mazáč (Institute
of Advanced Study\, Princeton) as part of East Asian String Webinars\n\n\
nAbstract\nI will discuss the problem of bounding higher derivative coupli
ngs in consistent weakly coupled gravitational theories. The starting poin
t will be general assumptions about analyticity and Regge growth of the S-
matrix. Higher derivative couplings are expected to be of order one in the
units of the UV cutoff. Our approach justifies this expectation and allow
s us to prove precise bounds on the order one coefficients. I will explain
that the notorious difficulties presented by the graviton pole can be ove
rcome by measuring couplings at small impact parameter\, rather than in th
e forward limit. I will illustrate the method in theories containing a mas
sless scalar coupled to gravity\, and in theories with maximal supersymmet
ry. My talk will be based on https://arxiv.org/pdf/2102.08951.pdf\n
LOCATION:https://stable.researchseminars.org/talk/EASW/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ashoke Sen (Harish-Chandra Research Institute\, Allahabad)
DTSTART:20210423T080000Z
DTEND:20210423T090000Z
DTSTAMP:20260404T110914Z
UID:EASW/18
DESCRIPTION:Title: Action principle for self-dual forms\nby Ashoke Sen (Harish-Chand
ra Research Institute\, Allahabad) as part of East Asian String Webinars\n
\n\nAbstract\nIn this talk I'll describe recent progress towards finding a
n action for describing chiral 2n-form fields in 4n+2 dimensions.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:-- No Webinar --
DTSTART:20210226T030000Z
DTEND:20210226T040000Z
DTSTAMP:20260404T110914Z
UID:EASW/19
DESCRIPTION:by -- No Webinar -- as part of East Asian String Webinars\n\nA
bstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/EASW/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:-- No Webinar --
DTSTART:20210312T030000Z
DTEND:20210312T040000Z
DTSTAMP:20260404T110914Z
UID:EASW/20
DESCRIPTION:by -- No Webinar -- as part of East Asian String Webinars\n\nA
bstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/EASW/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Roberto Emparan (ICREA and U. de Barcelona)
DTSTART:20210409T070000Z
DTEND:20210409T080000Z
DTSTAMP:20260404T110914Z
UID:EASW/21
DESCRIPTION:Title: Digging traversable wormholes\nby Roberto Emparan (ICREA and U. d
e Barcelona) as part of East Asian String Webinars\n\n\nAbstract\nIn recen
t years there have appeared several constructions of traversable wormholes
\, in four and other dimensions\, which only involve physically acceptable
\, controllable ingredients. They connect in deep ways many aspects of gra
vity\, quantum field theory\, and quantum information. I will discuss seve
ral features of these constructions\, with a focus on traversability\, con
nectivity between multiple mouths\, and the (im)possibility of time travel
.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pavel Kovtun (University of Victoria)
DTSTART:20210507T030000Z
DTEND:20210507T040000Z
DTSTAMP:20260404T110914Z
UID:EASW/22
DESCRIPTION:Title: Hydrodynamics beyond hydrodynamics\nby Pavel Kovtun (University o
f Victoria) as part of East Asian String Webinars\n\n\nAbstract\nHydrodyna
mics is a well-established field with a venerable history. In this talk\,
I will focus on the foundational aspect of hydrodynamics which came to lig
ht in recent years. Do the equations of hydrodynamics even make sense? To
what degree can the crudeness of hydrodynamics be improved? How do we desc
ribe long-distance phenomena that hydrodynamics is supposed to describe bu
t fails to? And how universal is it really?\n
LOCATION:https://stable.researchseminars.org/talk/EASW/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Juan Pedraza (University Coll. London / Brandeis U.)
DTSTART:20210618T080000Z
DTEND:20210618T090000Z
DTSTAMP:20260404T110914Z
UID:EASW/23
DESCRIPTION:Title: Bit threads\, Einstein's equations and bulk locality\nby Juan Ped
raza (University Coll. London / Brandeis U.) as part of East Asian String
Webinars\n\n\nAbstract\nEntanglement plays a crucial role in questions per
taining to the emergence and dynamics of bulk spacetime. The proposal of R
yu and Takayanagi\, which relates the entanglement entropy of a boundary r
egion to the area of a codimension-two bulk surface\, has been crucial to
this effort. However\, holographic entanglement can also be formulated usi
ng `bit threads'\, i.e.\, divergenceless\, norm-bounded vector fields. In
this talk\, I will review recent work that studies how Einstein’s equati
ons are encoded in bit threads and how to understand bulk metric reconstru
ction in this language. Time permitting\, I'll also comment on the Lorentz
ian analog of this problem\, which is formulated in the context of the "co
mplexity=volume" proposal. This talk will be based on 2007.07907\, 2105.08
063\, 2105.12735 and work in progress.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hitoshi Murayama (UC Berkeley / Kavli IPMU)
DTSTART:20210521T033000Z
DTEND:20210521T043000Z
DTSTAMP:20260404T110914Z
UID:EASW/24
DESCRIPTION:Title: Some Exact Results in QCD-like and Chiral Gauge Theories\nby Hito
shi Murayama (UC Berkeley / Kavli IPMU) as part of East Asian String Webin
ars\n\n\nAbstract\nI present some exact results in QCD-like chiral gauge t
heories. They are exact when supersymmetric gauge theories are perturbed b
y anomaly-mediated supersymmetry breaking (AMSB). Thanks to the UV-insensi
tivity of AMSB\, SUSY results can be perturbed with no ambiguities even wh
en applied to composite fields. I find two phases for QCD-like theories\,
one with chiral symmetry breaking and another conformal. Our results for c
hiral gauge theories do not agree with what had been suggested by tumbling
. We suggest alternative schemes of tumbling-like interpretations. We see
no evidence that large SUSY breaking leads to phase transitions\, perhaps
protected by holomorphy.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Aninda Sinha (Indian Institute of Science)
DTSTART:20210604T080000Z
DTEND:20210604T090000Z
DTSTAMP:20260404T110914Z
UID:EASW/25
DESCRIPTION:Title: QFT\, EFT and GFT\nby Aninda Sinha (Indian Institute of Science)
as part of East Asian String Webinars\n\n\nAbstract\nI will talk about an
intriguing correspondence between 2-2 scattering in quantum field theory (
QFT) and an area of mathematics called geometric function theory (GFT). Th
e area of GFT that we will focus on is the theory of typically real\, univ
alent functions which are the relevant objects to understand scattering am
plitudes. This understanding relies heavily on a crossing symmetric disper
sion relation for 2-2 scattering that was recently resurrected and further
ed in the context of effective field theories (EFT). Time permitting\, I w
ill explain how to get the crossing symmetric EFT-hedron in effective fiel
d theories.\n
LOCATION:https://stable.researchseminars.org/talk/EASW/25/
END:VEVENT
END:VCALENDAR