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BEGIN:VEVENT
SUMMARY:Yiwen Pan (Sun Yat-sen University)
DTSTART:20200506T070000Z
DTEND:20200506T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/1
DESCRIPTION:Title: Schur correlation functions and deformation quantization\nby
Yiwen Pan (Sun Yat-sen University) as part of Strings and QFTs for Eurasi
an time zone\n\n\nAbstract\n4d N=2 and 3d N=4 SCFTs are found be to respec
tively associated to\, as protected subsectors of their algebras of local
operators\, 2d vertex operator algebras and 1d topological algebras. In th
e first half of the talk\, we will compute Schur correlation functions on
S3xS1 by the localization technique\, where the well-known localization ar
gument needs to be generalized. In the second half\, we propose a way to e
xtract a 1d topological algebra from the torus correlation functions of an
associated VOA χ[T4d]. In favorable situations\, the extracted algebra c
oincides with the deformation quantization of the Higgs branch of vacua of
the circle-reduction of T4d\, or otherwise a deformation quantization at
a different value of its period.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:June Nahmgoong (KIAS)
DTSTART:20200513T070000Z
DTEND:20200513T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/2
DESCRIPTION:Title: 6d Cardy formulas\nby June Nahmgoong (KIAS) as part of Strin
gs and QFTs for Eurasian time zone\n\n\nAbstract\nTitle: 6d Cardy formulas
\n\nAbstract: In this talk\, I will discuss the supersymmetric partition f
unctions of 6d SCFTs on R^4 X T^2 and S^5 X S^1 by focusing on their Cardy
limit asymptotics. For a 6d SCFT on N M5-branes\, the Cardy free energy i
s proportional to N^3\, and it accounts for the Bekenstein-Hawking entropy
of large BPS black holes in AdS_7 X S^4. In particular\, I will explain t
he two different approaches to obtain 6d Cardy formulas: the elliptic genu
s of self-dual strings and the 't Hooft anomalies.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Futoshi Yagi (Southwest Jiaotong University)
DTSTART:20200520T070000Z
DTEND:20200520T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/3
DESCRIPTION:Title: Complete prepotential for 5d N = 1 superconformal field theories
\nby Futoshi Yagi (Southwest Jiaotong University) as part of Strings a
nd QFTs for Eurasian time zone\n\n\nAbstract\nTitle:\nComplete prepotentia
l for 5d N = 1 superconformal field theories\n\nAbstract: \nIn general\, f
ive dimensional (5d) supersymmetric gauge theory can be understood as a de
formation of the superconformal field theory (SCFT) realized at the ultrav
iolet fixed point. The deformation parameters are interpreted as the masse
s and the gauge coupling constants of the gauge theory. However\, from the
viewpoint of the SCFT\, it is natural to extend the parameter region to t
he place where the original gauge theory description is not valid anymore.
For example\, we can consider the parameter region where the square of th
e gauge coupling constant becomes negative. If we choose such parameter re
gion\, the theory may flow to a different gauge theory or may flows to a n
on-Lagrangian theory at the infrared.\nWe propose the “complete” prepo
tential for 5d N=1 SCFT\, which is valid for the whole parameter region. T
he complete prepotential is constructed in such a way that it respects the
global symmetry of the SCFT and that it reduces to the perturbative prepo
tential found by Intriligator\, Morrison and Seiberg in the parameter regi
on where the gauge theory description is valid. The (p\,q) 5-brane web dia
gram plays an important role to understand the complete prepotential.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Meng-Chwan Tan (National University of Singapore)
DTSTART:20200527T070000Z
DTEND:20200527T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/4
DESCRIPTION:Title: Unifying lattice models\, links and quantum geometric Langlands
via branes in string theory\nby Meng-Chwan Tan (National University of
Singapore) as part of Strings and QFTs for Eurasian time zone\n\n\nAbstra
ct\nI will explain how\, starting with a stack of D4-branes ending on an N
S5-brane in type IIA string theory\, one can\, via T-duality and the topol
ogical-holomorphic nature of the relevant worldvolume theories\, relate (i
) the lattice models realized by Costello's 4d Chern-Simons theory\, (ii)
links in 3d analytically-continued Chern-Simons theory\, (iii) the quantum
geometric Langlands correspondence realized by Kapustin-Witten using 4d N
= 4 gauge theory and its quantum group modification\, and (iv) the Gaitsg
ory-Lurie conjecture relating quantum groups/affine Kac-Moody algebras to
Whittaker D-modules/W-algebras. This furnishes\, purely physically via bra
nes in string theory\, a novel bridge between the mathematics of integrabl
e systems\, geometric topology\, geometric representation theory\, and qua
ntum algebras.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Abhijit Gadde (TIFR\, Mumbai)
DTSTART:20200603T070000Z
DTEND:20200603T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/5
DESCRIPTION:Title: Modularity of supersymmetric partition functions\nby Abhijit
Gadde (TIFR\, Mumbai) as part of Strings and QFTs for Eurasian time zone\
n\n\nAbstract\nIn this talk\, I will present a novel modular property of 4
d N=1\nsupersymmetric partition functions of supersymmetric theories with\
nR-symmetry. It is a generalization of the modular invariance of the\nsupe
rsymmetric partition function of two-dimensional supersymmetric\ntheories
on a torus i.e. of the elliptic genus. It comes from\nrequiring consistenc
y of partition functions under gluing and\, among\nother things\, can be u
sed to rederive the supersymmetric Cardy formula\nfor four-dimensional gau
ge theories that has played a key role in\ncomputing the entropy of supers
ymmetric black holes.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Takahiro Nishinaka (Ritsumeikan University)
DTSTART:20200722T070000Z
DTEND:20200722T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/6
DESCRIPTION:Title: Argyres-Douglas theories\, S-duality and AGT correspondence\
nby Takahiro Nishinaka (Ritsumeikan University) as part of Strings and QFT
s for Eurasian time zone\n\n\nAbstract\nArgyres-Douglas (AD) CFTs are a se
ries of 4d N=2 superconformal field theories with Coulomb branch operators
of fractional scaling dimensions. Since they are strongly coupled\, it is
hard to compute the partition function of AD CFTs and their cousins via t
he supersymmetric localization. In this talk\, I will discuss computing th
e partition function of gauge theories involving Argyres-Douglas CFTs in t
heir matter sector\, using the generalized AGT correspondence as a tool. O
ur result is particularly consistent with the S-duality when the gauging i
s exactly marginal.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shlomo Razamat (Technion\, Israel)
DTSTART:20200617T070000Z
DTEND:20200617T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/7
DESCRIPTION:Title: SQCD and pairs of pants\nby Shlomo Razamat (Technion\, Israe
l) as part of Strings and QFTs for Eurasian time zone\n\n\nAbstract\nWe wi
ll show that minimally supersymmetric SU(N+2) SQCD models in the middle of
the conformal window can be engineered by compactifying certain 6d SCFTs
on three punctured spheres.\nThe geometric construction of the 4d theories
predicts numerous interesting strong coupling effects\, such as IR symmet
ry enhancements and duality. We will discuss this interplay \nbetween simp
le geometric and group theoretic considerations and complicated field theo
retic strong coupling phenomena. For example\, one of the dualities arisin
g geometrically from \ndifferent pair-of-pants decompositions of a four pu
nctured sphere is an $SU(N+2)$ generalization of the Intriligator-Pouliot
duality of $SU(2)$ SQCD with $N_f=4$\, which is a degenerate\, $N=0$\, in
stance of our discussion.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Aninda Sinha (IISc\, Bangalore)
DTSTART:20200715T070000Z
DTEND:20200715T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/8
DESCRIPTION:Title: Relative entropy in scattering and the S-matrix bootstrap\nb
y Aninda Sinha (IISc\, Bangalore) as part of Strings and QFTs for Eurasian
time zone\n\n\nAbstract\nAbstract: I will talk about how relative entropy
\, a concept in quantum information theory to distinguish two density matr
ices\, behaves in 2-2 scattering in quantum field theory\, string theory\,
chiral perturbation theory and the numerical S-matrix bootstrap. In the c
ontext of massive quantum field theories\, I will derive high energy bound
s on relative entropy as well as study the Regge behaviour. One applicatio
n of such line of questioning will be a general explanation why the curvat
ure of the Regge trajectory in massive quantum field theories must be posi
tive. Then I will turn to the S-matrix bootstrap. I will give a broad over
view of what this program is about and how to constrain pion scattering wi
th it. Here\, some insight from relative entropy will prove to be handy to
constrain the space of S-matrices. Finally I will discuss how hypothesis
testing using relative entropy can prove useful to distinguish S-matrices
in the space of allowed S-matrices.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sujay Ashok (IMSc\, Chennai)
DTSTART:20200701T070000Z
DTEND:20200701T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/9
DESCRIPTION:Title: Surface Defects from Fractional Branes\nby Sujay Ashok (IMSc
\, Chennai) as part of Strings and QFTs for Eurasian time zone\n\n\nAbstra
ct\nWe show that the Gukov-Witten monodromy defects of supersymmetric Yang
-Mills theory can be realized in perturbative string theory by considering
an orbifold background of the Kanno-Tachikawa type and placing stacks of
fractional D3-branes whose world-volume partially extends along the orbifo
ld directions. In particular\, we show that turning on a constant backgrou
nd value for some scalar fields in the closed string twisted sectors induc
es a non-trivial profile for the gauge field and one of the complex scalar
s of the world-volume theory\, and that this profile exactly matches the s
ingular behavior that one expects for a Gukov-Witten surface defect in the
N=4 supersymmetric gauge theory.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Saebyeok Jeong (Rutgers)
DTSTART:20200624T130000Z
DTEND:20200624T140000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/10
DESCRIPTION:Title: Opers\, isomonodromic deformations\, and surface defects\nb
y Saebyeok Jeong (Rutgers) as part of Strings and QFTs for Eurasian time z
one\n\n\nAbstract\nOne of interesting discoveries on the four-dimensional
N=2 gauge theories is their role in the quantum/classical duality\, in whi
ch a problem in quantum regime translates to a classical one in the other.
In particular\, the problem of quantizing the Hitchin integrable system i
s related to the problem of holomorphic symplectic geometry of the moduli
space of flat connections on Riemann surfaces and its Lagrangian subvariet
ies. In this talk\, I will present how the N=2 gauge theories with half-BP
S surface defects provide a physical understanding of such a duality. Also
if time permits\, I will discuss another version of quantum/classical dua
lity related to isomonodromic deformations of Fuchsian systems\, which cou
ld be understood in a similar field theoretical setting.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marcus Sperling (Yau Center\, Tsinghua)
DTSTART:20200708T070000Z
DTEND:20200708T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/11
DESCRIPTION:Title: Higgs Branches\, Magnetic Quivers\, and Hasse Diagrams\nby
Marcus Sperling (Yau Center\, Tsinghua) as part of Strings and QFTs for Eu
rasian time zone\n\n\nAbstract\nMagnetic quivers and Hasse diagrams have r
ecently been developed to study gauge theories with 8 supercharges at UV
fixed points. For a given low-energy gauge theory realised via a Type II b
rane construction\, there exist magnetic quivers for the Higgs branches at
finite and infinite gauge coupling. \nComparing these moduli spaces allow
s to study the non-perturbative effects when transitioning to the fixed po
int. For 5d N=1 SQCD\, 5-brane webs have been an important tool for deriv
ing magnetic quivers. In this talk\, the emphasis is placed on 5-brane we
bs with orientifold 5-planes which give rise to 5d theories with orthogon
al or symplectic gauge groups. For this set-up\, I will exemplify the mag
netic quiver prescription and contrast it against a unitary magnetic quive
r description extracted from an O7 construction. An important class of fa
milies considered are the orthogonal exceptional families\, realised as in
finite coupling Higgs branches of Sp(k) gauge theories with fundamental ma
tter. For both classes of magnetic quivers\, I will discuss the associate
d Hasse diagrams for selected examples. Their agreement further validates
the approach taken.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jie-qiang Wu (MIT)
DTSTART:20200602T140000Z
DTEND:20200602T150000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/12
DESCRIPTION:Title: Peierls bracket and gravitational dressing in Jackiw-Teitelboim
gravity\nby Jie-qiang Wu (MIT) as part of Strings and QFTs for Eurasi
an time zone\n\n\nAbstract\nHow to deal with diffeomorphism symmetries is
one of the difficult problem in general relativity. Because of the diffeom
orphism symmetries\, we need to consider diffeomorphism invariant operator
s and gravitational dressing. In this work\, we try to use Peierls bracket
to study the commutator between the gravitational dressing operator and t
he ADM energy operator. Our result also strengthens the Marolf-Polchinski
firewall argument. \nIn the talk\, I will first briefly review the Peierls
bracket\, which is a linear response interpretation of bracket computatio
n in covariant phase space formalism. We also illustrate the Peierls brack
et with several examples. After that\, we use Peierls bracket to study the
Hamiltonian flow of the gravitational dressing operator\, from which we c
an read out the commutator between the gravitational dressing operator wit
h ADM energy operator.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alex Belin (CERN)
DTSTART:20200622T130000Z
DTEND:20200622T140000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/13
DESCRIPTION:Title: Gravitational path integral from the T2 deformation\nby Ale
x Belin (CERN) as part of Strings and QFTs for Eurasian time zone\n\n\nAbs
tract\nWe study a T2 deformation of large N conformal field theories\, a h
igher dimensional generalization of the TT¯ deformation. The deformed par
tition function satisfies a flow equation of the diffusion type. We solve
this equation by finding its diffusion kernel\, which is given by the Eucl
idean gravitational path integral in d+1 dimensions between two boundaries
with Dirichlet boundary conditions for the metric. This is natural given
the connection between the flow equation and the Wheeler-DeWitt equation\,
on which we offer a new perspective by giving a gauge-invariant relation
between the deformed partition function and the radial WDW wave function.
An interesting output of the flow equation is the gravitational path integ
ral measure which is consistent with a constrained phase space quantizatio
n. Finally\, we comment on the relation between the radial wave function a
nd the Hartle-Hawking wave functions dual to states in the CFT\, and propo
se a way of obtaining the volume of the maximal slice from the T2 deformat
ion.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Noppadol Mekareeya (INFN\, Milan Bicocca)
DTSTART:20200902T070000Z
DTEND:20200902T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/14
DESCRIPTION:Title: 3d mirrors of the circle reduction of twisted A_{2N} theories o
f class S\nby Noppadol Mekareeya (INFN\, Milan Bicocca) as part of Str
ings and QFTs for Eurasian time zone\n\n\nAbstract\nMirror symmetry is a p
owerful tool to investigate properties of higher dimensional SCFTs upon co
mpactification to three dimensions. In this talk\, we propose a prescripti
on for constructing 3d mirrors of the circle reduction of twisted A_{2N} t
heories of class S. Several explicit examples that provide non-trivial tes
ts for our proposal will be discussed. We will also show how the 3d mirror
quiver description can be used to make novel predictions about the origin
al 4d theories\, including the presence of massive deformations leading to
supersymmetry enhancements. As a by-product of our construction\, we prop
ose non-trivial dualities between quiver theories with mixed unitary\, sym
plectic and special orthogonal gauge groups and those with unitary groups
only.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hee-Cheol Kim (POSTECH)
DTSTART:20200729T070000Z
DTEND:20200729T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/15
DESCRIPTION:Title: Branes and the Swampland\nby Hee-Cheol Kim (POSTECH) as par
t of Strings and QFTs for Eurasian time zone\n\n\nAbstract\nI will talk ab
out a novel idea on the Swampland program that uses consistency of what li
ves on the string probes in gravitational theories. The central charges an
d the levels of current algebras of 2d CFTs on these strings can be calcul
ated by anomaly inflow mechanism and used to provide constraints on the su
pergravity theories based on unitarity of the worldsheet CFT. I will show
some of the theories with 8 or 16 supersymmetries\, which are otherwise co
nsistent looking\, belong to the Swampland.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matteo Sacchi (INFN\, Milan Bicocca)
DTSTART:20200826T070000Z
DTEND:20200826T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/16
DESCRIPTION:Title: New dualities from dimensional reductions and uplifts\nby M
atteo Sacchi (INFN\, Milan Bicocca) as part of Strings and QFTs for Eurasi
an time zone\n\n\nAbstract\nDualities in 4\, 3 and 2 dimensions are relate
d by different types of dimensional reduction limits. These can be effecti
vely exploited to find new dualities by either dimensional reduction or up
lift of already known ones. In this talk\, I will present some examples of
both these approaches. I will first discuss some new dualities for 2d N=(
0\,2) theories that can be derived from reduction of 4d N=1 dualities on a
two-sphere with a topological twist. Then\, I will discuss the four-dimen
sional uplift of the three-dimensional mirror symmetry\, for which a 4d an
cestor wasn't known before.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mauricio Romo (Yau Center\, Tsinghua)
DTSTART:20200805T070000Z
DTEND:20200805T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/17
DESCRIPTION:Title: Exponential Networks: BPS quivers and enumerative invariants\nby Mauricio Romo (Yau Center\, Tsinghua) as part of Strings and QFTs fo
r Eurasian time zone\n\n\nAbstract\nI will present an introduction of the
basics of exponential networks associated to CY 3-folds described by conic
bundles. I will focus on how one can extract BPS quivers from degenerate
networks at special points in the parameters and how to use a generalizati
on of the nonabelianization map (as defined for spectral networks) to coun
t 5d BPS states. This is based on joint work with S. Banerjee and P. Longh
i.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dongmin Gang (APCTP)
DTSTART:20200812T070000Z
DTEND:20200812T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/18
DESCRIPTION:Title: M-theoretic genesis of topological phases\nby Dongmin Gang
(APCTP) as part of Strings and QFTs for Eurasian time zone\n\n\nAbstract\n
I will talk about a novel way of constructing (2+1)d topological phases us
ing M-theory. \nThey emerge as macroscopic world-volume theory of M5-brane
s wrapped on non-hyperbolic 3-manifolds. \nAfter explaining the algorithm
of extracting modular structures of the topological phase from topologica
l data of the 3-manifold\, I will discuss the possibility of full classifi
cation of topological orders via the geometrical construction.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hao-Zhi Zhang (SUSTECH)
DTSTART:20200730T130000Z
DTEND:20200730T140000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/19
DESCRIPTION:Title: Classification of SET orders with onsite symmetries\nby Hao
-Zhi Zhang (SUSTECH) as part of Strings and QFTs for Eurasian time zone\n\
n\nAbstract\nIn this talk I will explain two different approaches towards
the classifications of symmetry protected trivial (SPT) orders and symmetr
y enriched topological (SET) orders with unitary finite onsite symmetries
in all dimensions. The first approach is based on the idea of gauging the
symmetry. I will explain this idea for 2d SPT/SET orders in details. The s
econd approach is based on the boundary-bulk relation. All the information
of a SET order is contained in the bulk.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Si Li (Yau Center\, Tsinghua)
DTSTART:20200923T070000Z
DTEND:20200923T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/21
DESCRIPTION:Title: Open-closed topological B-model via large N\nby Si Li (Yau
Center\, Tsinghua) as part of Strings and QFTs for Eurasian time zone\n\n\
nAbstract\nWe describe the coupling of holomorphic Chern-Simons theory at
large N with Kodaira-Spencer gravity. We explain a new anomaly cancellatio
n mechanism at all loops in perturbation theory for open-closed topologica
l B-model. At one loop this anomaly cancellation is analogous to the Green
-Schwarz mechanism. As an application\, we introduce a type I version of K
odaira-Spencer theory in complex dimension 5 and show that it can only be
coupled to holomorphic Chern-Simons theory with gauge group SO(32) at quan
tum level. This coupled system is conjectured to be a supersymmetric local
ization of type I string theory. This is joint work with Kevin Costello.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yutin Huang (National Taiwan University)
DTSTART:20200806T130000Z
DTEND:20200806T140000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/22
DESCRIPTION:Title: The silence of binary Kerr\nby Yutin Huang (National Taiwan
University) as part of Strings and QFTs for Eurasian time zone\n\n\nAbstr
act\nA non-trivial S-matrix generally implies a production of entanglement
: starting with an incoming pure state the scattering generally returns an
outgoing state with non-vanishing entanglement entropy. It is then intere
sting to ask if there exists a non-trivial S-matrix that generates no enta
nglement. To this end we study the spin-entanglement in the scattering of
arbitrary spinning particles. Augmented with Thomas-Wigner rotation facto
rs\, we derive the entanglement entropy from the gravitational induced 2->
2 amplitude. In the Eikonal limit\, we find that the relative entanglemen
t entropy\, defined as the difference between the entanglement entropy of
the in and out-states\, is nearly zero for minimal coupling\, and increase
s significantly for any non-vanishing spin multipole moments. This suggest
s that minimal couplings of spinning particles\, whose classical limit cor
responds to Kerr black hole\, has the unique feature of generating near ze
ro entanglement.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yikun Jiang (Cornell)
DTSTART:20200821T020000Z
DTEND:20200821T030000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/23
DESCRIPTION:Title: Islands in cosmology\nby Yikun Jiang (Cornell) as part of S
trings and QFTs for Eurasian time zone\n\n\nAbstract\nRecent developments
in understanding the black hole information paradox have led to the `quant
um extremal island’ prescription for calculating the fine-grained entrop
y of a quantum system entangled with gravitational degrees of freedom. A q
uantum extremal island suggests that a region of spacetime is encoded in t
he quantum state of another system\, like the encoding of the black hole i
nterior in Hawking radiation. We study conditions for islands to appear in
general spacetimes. They must violate Bekenstein's area bound in a precis
e sense (with a simple tensor network picture)\, and the boundary of an is
land must satisfy several quantum information-theoretic inequalities. Thes
e conditions combine to impose very strong restrictions\, which we apply t
o cosmological models. In this talk\, I will mainly focus on the example o
f four-dimensional FRW cosmology with radiation and a negative cosmologica
l constant entangled with an auxiliary non-gravitational Minkowski spaceti
me in the thermofield double state\, where an island appears near the turn
ing point when the geometry begins to recollapse. If time permits\, I will
also briefly explain our results for islands in the two-dimensional model
s of JT gravity in de Sitter spacetime. The talk will be based on work: 20
08.01022 with Thomas Hartman and Edgar Shaghoulian.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Babak Haghighat (Yau Center\, Tsinghua)
DTSTART:20201202T070000Z
DTEND:20201202T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/24
DESCRIPTION:Title: Elliptic Quantum Curves of Class Sk\nby Babak Haghighat (Ya
u Center\, Tsinghua) as part of Strings and QFTs for Eurasian time zone\n\
n\nAbstract\nQuantum curves arise from Seiberg-Witten curves associated to
4d N=2 gauge theories by promoting coordinates to non-commutative operato
rs. In this way the algebraic equation of the curve is interpreted as an o
perator equation where a Hamiltonian acts on a wave-function with zero eig
envalue. We find that this structure generalises when one considers torus-
compactified 6d N=(1\,0) SCFTs. The corresponding quantum curves are ellip
tic in nature and hence the associated eigenvectors/eigenvalues can be exp
ressed in terms of Jacobi forms. In this talk\, we focus on the class of 6
d SCFTs arising from M5 branes transverse to a C2/Zk singularity. In the l
imit where the compactified 2-torus has zero size\, the corresponding 4d N
=2 theories are known as class Sk. We explicitly show that the eigenvector
s associated to the quantum curve are expectation values of codimension 2
surface operators\, while the corresponding eigenvalues are codimension 4
Wilson surface expectation values.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Johanna Knapp (University of Melbourne)
DTSTART:20201021T070000Z
DTEND:20201021T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/25
DESCRIPTION:Title: GLSMs\, localisation\, and the stringy Kahler moduli space\
nby Johanna Knapp (University of Melbourne) as part of Strings and QFTs fo
r Eurasian time zone\n\n\nAbstract\nGauged linear sigma models (GLSMs) can
be used to analyse Calabi-Yaus and their moduli spaces. Different low ene
rgy configurations ("phases") of a GLSM describe Calabi-Yaus in different\
, not necessarily large volume\, regions of the Kahler moduli space. We pr
ovide evidence that the sphere and hemisphere partition functions of Calab
i-Yau GLSMs\, when evaluated in different types of phases\, have a univers
al structure. The main ingredients that enter the result are Givental's I/
J-functions\, the Gamma class\, and\, in the case of the hemisphere\, the
Chern character of a D-brane. This is based on joint work with D. Erkinger
\, M. Romo\, and E. Scheidegger.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/25/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Xin Wang (KIAS)
DTSTART:20201014T070000Z
DTEND:20201014T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/26
DESCRIPTION:Title: Elliptic blowup equations for 6d SCFTs\nby Xin Wang (KIAS)
as part of Strings and QFTs for Eurasian time zone\n\n\nAbstract\nSix is t
he highest dimension in which representation theory allows for interacting
superconformal field theories (SCFTs). By considering F-theory compactifi
cations on elliptic non-compact Calabi-Yau three-folds\, those 6d (1\,0) S
CFTs are completely classified. Their BPS partition functions are captured
by the elliptic genera of the corresponding world-sheet theories. In this
talk\, I will introduce novel functional equations for the BPS partition
functions for all 6d (1\,0) SCFTs along the classifications\, we call thes
e equations "Elliptic blowup equations"\, which can be formally derived fr
om the perturbative inputs of topological string partition functions on th
e same Calabi-Yau three-folds\, based on the blowup equations for refined
topological strings. Specifically\, for the rank one cases in the tensor b
ranch\, we developed various methods to solve the elliptic genera from the
elliptic blowup equations\, solved the elliptic genera for almost all ran
k one theories completely.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/26/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kohei Iwaki (University of Tokyo)
DTSTART:20201028T070000Z
DTEND:20201028T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/27
DESCRIPTION:Title: Topological recursion and uncoupled BPS structure arising from
spectral curves of hypergeometric type\nby Kohei Iwaki (University of
Tokyo) as part of Strings and QFTs for Eurasian time zone\n\n\nAbstract\nI
will discuss a relationship between the following two objects defined fro
m the spectral curves of hypergeometric differential equation and its conf
luent degenerations: The free energy compute by Eynard-Orantin's topologi
cal recursion\, and BPS spectrum (degeneration of spectral networks) for t
he corresponding quadratic differentials computed by the algorithm of Gaio
tto-Moore-Neitzke / Bridgeland-Smith. In particular\, I’ll show a simple
formula expressing the topological recursion free energies as a sum over
BPS states. My talk is based on a joint work with O. Kidwai.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/27/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kwok Wai Chan (Chinese University of Hong Kong)
DTSTART:20201104T070000Z
DTEND:20201104T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/28
DESCRIPTION:Title: Quantization of Kahler manifolds\nby Kwok Wai Chan (Chinese
University of Hong Kong) as part of Strings and QFTs for Eurasian time zo
ne\n\n\nAbstract\nI will report on recent joint works with Conan Leung and
Qin Li on some new relations between deformation quantization\, geometric
quantization\, Berezin-Toeplitz quantization and BV quantization on Kahle
r manifolds\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/28/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jaewon Song (KAIST)
DTSTART:20200909T070000Z
DTEND:20200909T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/29
DESCRIPTION:Title: Classification of large N superconformal gauge theories and the
Weak Gravity Conjecture\nby Jaewon Song (KAIST) as part of Strings an
d QFTs for Eurasian time zone\n\n\nAbstract\nWe classify the large N limit
s of four-dimensional supersymmetric gauge theories with simple gauge grou
ps that flow to superconformal fixed points. We restrict ourselves to the
ones without a superpotential and with a fixed flavor symmetry. We find 34
classes in total\, with 8 having a dense spectrum of chiral gauge-invaria
nt operators. The central charges a and c for the dense theories grow line
arly in N in contrast to the N^2 growth for the theories with a sparse spe
ctrum. We find that there can be multiple bands separated by a gap\, or a
discrete spectrum above the band. We also find a criterion on the matter c
ontent for the fixed point theory to possess either a dense or sparse spec
trum. We discover a few curious aspects regarding supersymmetric RG flows
and a-maximization along the way. For all the theories with the dense spec
trum\, the AdS version of the Weak Gravity Conjecture (including the conve
x hull condition for the cases with multiple U(1)'s) holds for large enoug
h N even though they do not have weakly-coupled gravity duals.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/29/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hiroshi Iritani (Kyoto University)
DTSTART:20201125T070000Z
DTEND:20201125T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/30
DESCRIPTION:Title: Gamma conjecture for Fano and Calabi-Yau manifolds\nby Hiro
shi Iritani (Kyoto University) as part of Strings and QFTs for Eurasian ti
me zone\n\n\nAbstract\nThe Gamma conjecture is a conjecture about the rela
tionship \nbetween quantum cohomology and a characteristic class called th
e \nGamma class. In this talk\, I will give an introduction to this conjec
ture \nand explain the relationship to mirror symmetry. I will focus on th
e Fourier-Laplace \nduality between the Gamma conjectures for Fano and Cal
abi-Yau manifolds.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/30/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yuya Tanizaki (Kyoto University)
DTSTART:20200930T070000Z
DTEND:20200930T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/32
DESCRIPTION:Title: Topological aspects of oblique confinement in the Cardy-Rabinov
ici model\nby Yuya Tanizaki (Kyoto University) as part of Strings and
QFTs for Eurasian time zone\n\n\nAbstract\nConfinement is one of the most
important but basic features of non-Abelian gauge theories\, and an intuit
ive and interesting scenario of its dynamics is condensation of magnetic m
onopoles. When we add the topological theta term to it\, more exotic conde
nsations may appear\, which are called oblique confinement phases. In a 4d
lattice model proposed by Cardy and Rabinovici\, such interesting phases
can be explicitly realized. In this talk\, I will uncover its topological
nature based on the recent applications of 't Hooft anomaly matching. More
over\, it has been known that the local dynamics of Cardy-Rabinovici model
shows the SL(2\,Z) self-duality\, but it turns out that the self-duality
does not extend to the global aspect of the original theory. We cooked up
a SL(2\,Z) self-dual theory by gauging a part of the 1-form symmetry of th
e Cardy-Rabinovici model\, and the self-duality has a mixed gravitational
anomaly. These data give useful constraints to discuss the phase diagram.\
n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/32/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yasunori Lee (University of Tokyo)
DTSTART:20201216T070000Z
DTEND:20201216T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/33
DESCRIPTION:Title: Revisiting Wess-Zumino-Witten terms\nby Yasunori Lee (Unive
rsity of Tokyo) as part of Strings and QFTs for Eurasian time zone\n\n\nAb
stract\nWe revisit various topological issues concerning 4d Wess-Zumino-Wi
tten terms for SU and SO QCD\, from the modern bordism point of view. We e
xplain why the definition of the 4d WZW terms requires the spin structure\
, and also discuss how the mixed anomaly involving the 1-form symmetry of
SO QCD is reproduced in the low-energy sigma model.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/33/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sunghyuk Park (Caltech)
DTSTART:20201209T070000Z
DTEND:20201209T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/34
DESCRIPTION:Title: 3-manifolds\, q-series\, and topological strings\nby Sunghy
uk Park (Caltech) as part of Strings and QFTs for Eurasian time zone\n\n\n
Abstract\nZ-hat\, also known as the homological block\, is an invariant of
3-manifolds valued in BPS q-series introduced by Gukov\, Putrov and Vafa
in their study of 3d N=2 theory T[M3]. In this talk\, I will give a gentle
introduction to Z-hat\, highlighting some recent developments including t
he use of R-matrix for Verma modules\, generalization to higher rank\, the
large N-limit and interpretation as open topological string partition fun
ctions.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/34/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zhihao Duan (KIAS)
DTSTART:20201223T070000Z
DTEND:20201223T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/35
DESCRIPTION:Title: Fermionic rational CFTs and Modular Linear Differential Equatio
ns\nby Zhihao Duan (KIAS) as part of Strings and QFTs for Eurasian tim
e zone\n\n\nAbstract\nIn this talk\, I will revisit the idea of classifyin
g rational conformal field theories (CFTs) from modular linear differentia
l equations (MLDEs). I will start by reviewing what is known in the bosoni
c setup\, and then generalize it to fermionic cases. In particular\, I wil
l define fermionic MLDEs and use them to classify fermionic rational CFTs
with small number of characters. Properties of theories we found will be d
iscussed and analyzed. This talk is based on arXiv: 2010.12392 and some re
sults to appear.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/35/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Keita Nii (YITP\, Kyoto)
DTSTART:20201230T070000Z
DTEND:20201230T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/36
DESCRIPTION:Title: Generalized Giveon-Kutasov duality\nby Keita Nii (YITP\, Ky
oto) as part of Strings and QFTs for Eurasian time zone\n\n\nAbstract\nIn
this talk\, I will propose a generalized version of the conventional\nGive
on-Kutasov duality.\nThis generalization includes a fully-generalized Cher
n-Simons\ninteraction for the U(N) gauge group.\nIn addition\, this genera
lization unfies the SU(N) and U(N)\nChern-Simons matter dualities into a s
ingle duality.\nAs an application of this duality\, we can see duality enh
ancement for\nthe abelican cases.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/36/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dongwook Ghim (KIAS)
DTSTART:20210113T070000Z
DTEND:20210113T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/37
DESCRIPTION:Title: 5d BPS quivers and KK towers\nby Dongwook Ghim (KIAS) as pa
rt of Strings and QFTs for Eurasian time zone\n\n\nAbstract\nIn this talk\
, I will present recent progress in computing (refined) Witten index of BP
S quiver for 5d gauge theories\, compactified on a circle. With stringy BP
S objects in 5d theory being wrapped on the circle\, the wall-crossing pro
blem of 4d KK theory can be addressed by N=4 quiver quantum mechanics. How
ever\, the fine-tuned superpotential of the latter makes many of the known
machinery fail to capture its indices. I will show how the subtlety can b
e bypassed for a restricted class of BPS quivers. \n\nSpecifically\, I wil
l construct the entire KK tower of Cartan components in vector multiplets\
, based on L2 cohomology counting and D0 brane picture. Then the analysis
will be extended to purely electric BPS particles without magnetic or inst
anton charges in the weak coupling chamber.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/37/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Aswin Balasubramanian (Rutgers)
DTSTART:20210127T070000Z
DTEND:20210127T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/38
DESCRIPTION:Title: Families of Hitchin system\, N=2 theories and the Deligne-Simps
on problem\nby Aswin Balasubramanian (Rutgers) as part of Strings and
QFTs for Eurasian time zone\n\n\nAbstract\nMotivated by the relation to 4d
N=2 theories\, I will describe tame SL_N Hitchin integrable systems as fl
at families over \\bar{M}\, the Deligne-Mumford moduli space associated to
the underlying Riemann surface. Then\, I will use this description to cla
rify certain questions about the behaviour of the Coulomb branches of thes
e N=2 theories near the boundaries of \\bar{M}. As a further application o
f the setup\, I will describe an interesting relationship between Class S
theories and a particular instance of the Deligne-Simpson problem. This is
based on joint work with J. Distler and R. Donagi.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/38/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yutaka Matsuo (University of Tokyo)
DTSTART:20210203T070000Z
DTEND:20210203T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/39
DESCRIPTION:Title: q-Deformation of Corner Vertex Operator Algebras by Miura Trans
formation\nby Yutaka Matsuo (University of Tokyo) as part of Strings a
nd QFTs for Eurasian time zone\n\n\nAbstract\nRecently\, Gaiotto and Rapca
k proposed a generalization of WN algebra by considering the symmetry at t
he corner of the brane intersection (corner vertex operator algebra). The
algebra\, denoted as YL\,M\,N\, is characterized by three non-negative int
egers L\,M\,N. It has a manifest triality automorphism which interchanges
L\,M\,N\, and can be obtained as a reduction of W1+∞ through a "pit" in
the plane partition representation. \nLater\, Prochazka and Rapcak propose
d a representation of YL\,M\,N in terms of L+N+M free bosons through a gen
eralization of Miura transformation\, where they use the fractional power
differential operators. \nIn this paper\, we derive a q-deformation of the
ir Miura transformation. It gives the free field representation for q-defo
rmed YL\,M\,N\, which is obtained as a reduction of the quantum toroidal a
lgebra. We find that the q-deformed version has a "simpler" structure than
the original one because of the Miki duality in the quantum toroidal alge
bra. For instance\, one can find a direct correspondence between the opera
tors obtained by the Miura transformation and those of the quantum toroida
l algebra. Furthermore\, we can show that the screening charges of both th
e symmetries are identical.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/39/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jirui Guo (Yau Center\, Tsinghua)
DTSTART:20210224T070000Z
DTEND:20210224T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/40
DESCRIPTION:Title: A GLSM view on homological projective duality\nby Jirui Guo
(Yau Center\, Tsinghua) as part of Strings and QFTs for Eurasian time zon
e\n\n\nAbstract\nHomological projective duality (HPD) is a generalization
of projective duality at the categorical level. It has been noticed that d
ifferent phases of some gauged linear sigma models are related by HPD. Giv
en a projective embedding\, this duality can be formulated explicitly by c
onstructing a GLSM describing the universal hyperplane section. I will out
line the structure and application of this type of GLSM in this talk. It c
an be shown\, by analysis of brane transport\, that the HPD is realized by
the Higgs branch of one of the phases. Application of this formulation to
examples such as Veronese embedding\, quadrics\, complete intersections a
nd Plucker embedding reproduces existing mathematical results and provides
descpritions of new HPDs. It also explains why\, in many cases\, two phas
es of a GLSM are related by homological projective duality.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/40/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yegor Zenkevich (ITEP)
DTSTART:20210217T070000Z
DTEND:20210217T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/41
DESCRIPTION:Title: On the structure of elliptic Ding-Iohara-Miki algebra\nby Y
egor Zenkevich (ITEP) as part of Strings and QFTs for Eurasian time zone\n
\n\nAbstract\nElliptic Ding-Iohara-Miki (DIM) algebra is an elliptic defor
mation of\nthe trigonometric DIM algebra\, in which the commutators of the
\ngenerating currents are expressed through Jacobi theta functions. This\n
algebra plays the key role in the generalization of the AGT relations\nto
six-dimensional gauge theories and elliptic Virasoro algebras. We\nprove t
hat the elliptic DIM algebra is in fact isomorphic to a direct\nsum of a t
rigonometric DIM algebra and an extra Heisenberg algebra. We\nalso discuss
the representation theory\, R-matrix and intertwiners for\nthe elliptic a
lgebra.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/41/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Oren Bergman (Technion)
DTSTART:20210317T070000Z
DTEND:20210317T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/42
DESCRIPTION:Title: Deforming 5d superconformal field theories\nby Oren Bergman
(Technion) as part of Strings and QFTs for Eurasian time zone\n\nAbstract
: TBA\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/42/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Seung-Joo Lee (IBS)
DTSTART:20210407T070000Z
DTEND:20210407T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/45
DESCRIPTION:Title: Quantum Gravity Constraints and Emergent Strings\nby Seung-
Joo Lee (IBS) as part of Strings and QFTs for Eurasian time zone\n\n\nAbst
ract\nThis talk aims to study the way string theory realizes various conje
ctures on quantum gravity. Starting with the F-theory description of a gau
ge theory coupled to gravity\, we will first analyze the limit in Kähler
moduli space where the gauge coupling tends to zero while gravity is kept
dynamical. In such a limit a key observation will be made about the appear
ance of a tensionless string. Focusing on U(1) gauge dynamics for concrete
ness\, we will look into the elliptic genus of this string in terms of cer
tain meromorphic weak Jacobi forms\, of which modular properties allow us
to determine the charge-to-mass ratios of certain string excitations. A to
wer of these asymptotically massless charged states will then be confirmed
to satisfy the (sub-)Lattice Weak Gravity Conjecture\, the Completeness C
onjecture\, and the Swampland Distance Conjecture.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/45/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sam Crew (Cambridge)
DTSTART:20210303T080000Z
DTEND:20210303T090000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/46
DESCRIPTION:Title: Hemisphere blocks of 3d N=4 quiver gauge theories\nby Sam C
rew (Cambridge) as part of Strings and QFTs for Eurasian time zone\n\n\nAb
stract\nI will discuss geometric and representation theoretic aspects of h
emisphere partition functions and vortices in 3d N=4 gauge theories. In pa
rticular\, I will talk about recent work in which we revisit holomorphic f
actorisation in terms of hemisphere partition functions and introduce new
formulae for various three manifold partition functions in terms of charac
ters of Higgs and Coulomb quantised chiral rings. As a particular example\
, I will discuss a theory described by the ADHM quiver in the presence of
a line operator and discuss Verma and simple modules of the relevant chira
l ring.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/46/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yutaka Yoshida (IPMU\, University of Tokyo)
DTSTART:20210331T070000Z
DTEND:20210331T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/47
DESCRIPTION:Title: Monopole bubbling and BPS 't Hooft operators in three\, four\,
and five dimensions.\nby Yutaka Yoshida (IPMU\, University of Tokyo)
as part of Strings and QFTs for Eurasian time zone\n\n\nAbstract\nWe evalu
ate the vacuum expectation values of half-BPS 't Hooft operators in super
symmetric gauge theories with eight supercharges in three\, four\, and fiv
e dimensions in terms of supersymmetric localization. \n\nIn localization
formulas\, there exist non-perturbative contributions from the moduli of
Dirac monopoles screened by 't Hooft-Polyakov monopoles\, called monopole
bubbling effects (a.k.a. monopole screening effects). \n\nBy introducing
orientifolds\, we generalize the brane construction of monopole bubbling e
ffects for SU(N) gauge theories to SO(N) and USp(N) gauge theories.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/47/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jihwan Oh (Oxford)
DTSTART:20210414T080000Z
DTEND:20210414T090000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/48
DESCRIPTION:Title: Twisted holography of M2 and M5 branes\nby Jihwan Oh (Oxfor
d) as part of Strings and QFTs for Eurasian time zone\n\n\nAbstract\nI wil
l review a recent development of twisted holography\, pioneered by Kevin C
ostello. Main examples will be twisted M-theory with M2 branes and M5 bran
es. After describing the Omega deformed and topologically twisted backgrou
nd\, I will discuss how to extract operator algebras of both sides of the
twisted M-theory and draw an isomorphism between them. The operator algebr
as of M2 and M5 branes are subalgebras of affine gl(1) Yangian. I will exp
lain how we can understand fusions of the algebras in the gravity side\, b
ased on my work with Yehao Zhou\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/48/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rui-Dong Zhu (Soochow University)
DTSTART:20210310T080000Z
DTEND:20210310T090000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/49
DESCRIPTION:Title: Topological Vertex for SO(N) Gauge Theories and beyond\nby
Rui-Dong Zhu (Soochow University) as part of Strings and QFTs for Eurasian
time zone\n\n\nAbstract\nWe propose an extended form of the topological v
ertex formalism that applies to (p\,q)-brane web with orientifolds\, by an
alyzing the geometric transition of Kim-Yagi’s prescription. A new topol
ogical vertex with only one leg is introduced into the formalism for the i
ntersection of (2\,1)-brane and the O-plane\, and we assign a vertex opera
tor to this intersection point in our proposal. We show the consistency of
this extended formalism and discuss its potential future usage in the stu
dy of SO(N) gauge theories etc.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/49/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kaiwen Sun (KIAS)
DTSTART:20210421T070000Z
DTEND:20210421T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/50
DESCRIPTION:Title: RG Flows\, Dualities and 5d Blowup Equations with Matters\n
by Kaiwen Sun (KIAS) as part of Strings and QFTs for Eurasian time zone\n\
n\nAbstract\nWe take the first step to classify all 5d (K-theoretic) blowu
p equations -- both unity and vanishing. In particular\, we find the full
set of blowup equations for all rank one\, two\, three and many higher ran
k 5d $\\mathcal{N}=1$ gauge theories and all exceptional gauge theories. O
ur strategy is starting from 5d Kaluza-Klein (KK) theories compactified fr
om 6d SCFTs and translating all elliptic blowup equations to K-theoretic b
lowup equations. Then we reduce the blowup equations by decoupling once at
a time the hypermultiplets in various representations. Interestingly\, fo
r rank higher than one theories\, along one single renormalization group (
RG) flow one does not always obtain all blowup equations from the upstream
theories. Instead\, each 5d theory inherits blowup equations from all its
parental theories in the flow web. We find the 5d dualities are highly no
n-trivially reflected in the map among blowup equations. We also study the
blowup equations near the 5d SCFT point and find the enhanced global symm
etry appears naturally. In particular\, all $r$ fields form Weyl orbits of
enhanced flavor group in the lattice of invariant Coulomb parameters.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/50/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sung-Soo Kim (University of Electronic Science and Technology of C
hina)
DTSTART:20210512T070000Z
DTEND:20210512T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/52
DESCRIPTION:Title: Bootstrapping BPS spectra of 5d/6d supersymmetric field theorie
s\nby Sung-Soo Kim (University of Electronic Science and Technology of
China) as part of Strings and QFTs for Eurasian time zone\n\n\nAbstract\n
In this talk\, we discuss a systematic approach to computing the BPS spect
ra of any 5d/6d supersymmetric quantum field theory in Coulomb phases\, ba
sed on the Nakajima-Yoshioka’s blowup equations. We generalize the blowu
p method in terms of both properly quantized magnetic fluxes on the blowup
C2 and the effective prepotential for 5d/6d field theories on the Omega b
ackground. We compute BPS spectra of all rank-1 and rank-2 5d KK theories
descending from 6d N=(1\,0) superconformal field theories compactified on
a circle with/without twist.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/52/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Minsung Kim (POSTECH)
DTSTART:20210714T070000Z
DTEND:20210714T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/53
DESCRIPTION:Title: 5d/6d Wilson loops from blowups\nby Minsung Kim (POSTECH) a
s part of Strings and QFTs for Eurasian time zone\n\n\nAbstract\nRecently\
, BPS spectra of large class of 5d and 6d supersymmetric quantum field the
ories are computed via blowup equation. In this talk\, we generalize the b
lowup formula to calculate the partition function of 5d/6d field theories
on Omega-background in presence of Wilson loop/Wilson surface operators or
codimension-4 defects. We test this approach by calculating their partiti
on functions in various 5d/6d field theories and comparing with known resu
lts and expected dualities.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/53/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mayuko Yamashita (RIMS)
DTSTART:20210721T070000Z
DTEND:20210721T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/54
DESCRIPTION:Title: The classification problem of non-topological invertible QFT’
s and a physically motivated model for the Anderson duals\nby Mayuko
Yamashita (RIMS) as part of Strings and QFTs for Eurasian time zone\n\n\nA
bstract\nFreed and Hopkins conjectured that the deformation classes of\nno
n-topological invertible quantum field theories are classified by a\ngener
alized cohomology theory called the Anderson dual of bordism\ntheories.\nT
wo of the main difficulty of this problem are the following.\nFirst\, we d
o not have the axioms for QFT’s.\nSecond\, The Anderson dual is defined
in an abstract way.\nIn this talk\, I will explain our results (arXiv:2106
.09270) to give a new\napproach to this conjecture\, in particular to over
come the second\ndifficulty above.\nWe construct a new\, physically motiva
ted model for the Anderson duals.\nThis model is constructed so that it ab
stracts a certain property of inverti\nble QFT’s which physicists believ
e to hold in general.\nI will start from basic motivations for the classif
ication problem\, report\nthe progress of our work and explain future dire
ctions.\nThis is the joint work with Kazuya Yonekura (Tohoku\, physics).\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/54/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Myungbo Shim (Kyung Hee University)
DTSTART:20210915T070000Z
DTEND:20210915T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/55
DESCRIPTION:Title: Non-unitary TQFTs from 3D N=4 rank-0 SCFTs\nby Myungbo Shim
(Kyung Hee University) as part of Strings and QFTs for Eurasian time zone
\n\n\nAbstract\nWe propose a novel procedure of assigning a pair of non-un
itary topological quantum field theories (TQFTs)\, TFT$_\\pm [\\CT_{\\rm r
ank \\\;0}]$\, to a (2+1)D interacting $\\CN=4$ superconformal field theor
y (SCFT) $\\CT_{\\rm rank \\\;0}$ of rank 0\, i.e.\\ having no Coulomb and
Higgs branches. The topological theories arise from particular degenerate
limits of the SCFT. Modular data of the non-unitary TQFTs are extracted
from the supersymmetric partition functions in the degenerate limits.
As a non-trivial dictionary\, we propose that $F = \\max_\\alpha \\left(-
\\log |S^{(+)}_{0\\alpha}| \\right) = \\max_\\alpha \\left(- \\log |S^{(-
)}_{0\\alpha}|\\right)$\, where $F$ is the round three-sphere free energy
of $\\CT_{\\rm rank \\\;0 }$ and $S^{(\\pm)}_{0\\alpha}$ is the first colu
mn in the modular S-matrix of TFT$_\\pm$. From the dictionary\, we deri
ve the lower bound on $F$\, $F \\geq -\\log \\left(\\sqrt{\\frac{5-\\sqrt{
5}}{10}} \\right) \\simeq 0.642965$\, which holds for any rank 0 SCFT. Th
e bound is saturated by the minimal $\\CN=4$ SCFT proposed by Gang-Yamazak
i\, whose associated topological theories are both the Lee-Yang TQFT. We e
xplicitly work out the (rank 0 SCFT)/(non-unitary TQFTs) correspondence fo
r infinitely many examples.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/55/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yosuke Imamura (Tokyo Institute of Technology)
DTSTART:20211013T070000Z
DTEND:20211013T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/56
DESCRIPTION:Title: Finite-N superconformal index via the AdS/CFT correspondence'\nby Yosuke Imamura (Tokyo Institute of Technology) as part of Strings a
nd QFTs for Eurasian time zone\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/56/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Akimi Watanabe (University of Tokyo)
DTSTART:20220126T070000Z
DTEND:20220126T080000Z
DTSTAMP:20260422T225844Z
UID:StringQFTEurasian/57
DESCRIPTION:Title: Quiver Quantum Toroidal Algebra and Crystal Representations
\nby Akimi Watanabe (University of Tokyo) as part of Strings and QFTs for
Eurasian time zone\n\n\nAbstract\nThis talk is based on arxiv:2108.07104 a
nd 2109.02045.\nWe propose a new class of algebras\, Quiver Quantum Toroid
al Algebra\, a generalization of Quantum Toroidal $gl_1$. It is known that
Quantum Toroidal $gl_1$ has representations by 1d\, 2d\, and 3d Young dia
grams. (Shifted) Quiver Quantum Toroidal Algebra acts on more general 1d\
, 2d\, and 3d crystals. We study the way of constructing 2d crystals repre
sentations from 1d crystals representations.\n
LOCATION:https://researchseminars.org/talk/StringQFTEurasian/57/
END:VEVENT
END:VCALENDAR