BEGIN:VCALENDAR
VERSION:2.0
PRODID:researchseminars.org
CALSCALE:GREGORIAN
X-WR-CALNAME:researchseminars.org
BEGIN:VEVENT
SUMMARY:Yiwen Pan (Sun Yat-sen University)
DTSTART:20200506T070000Z
DTEND:20200506T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/1
DESCRIPTION:Title: Schur correlation functions and deformation quantization<
/a>\nby Yiwen Pan (Sun Yat-sen University) as part of Strings and QFTs for
Eurasian time zone\n\n\nAbstract\n4d N=2 and 3d N=4 SCFTs are found be to
respectively associated to\, as protected subsectors of their algebras of
local operators\, 2d vertex operator algebras and 1d topological algebras
. In the first half of the talk\, we will compute Schur correlation functi
ons on S3xS1 by the localization technique\, where the well-known localiza
tion argument needs to be generalized. In the second half\, we propose a w
ay to extract a 1d topological algebra from the torus correlation function
s of an associated VOA χ[T4d]. In favorable situations\, the extracted al
gebra coincides with the deformation quantization of the Higgs branch of v
acua of the circle-reduction of T4d\, or otherwise a deformation quantizat
ion at a different value of its period.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:June Nahmgoong (KIAS)
DTSTART:20200513T070000Z
DTEND:20200513T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/2
DESCRIPTION:Title: 6d Cardy formulas\nby June Nahmgoong (KIAS) as part o
f Strings and QFTs for Eurasian time zone\n\n\nAbstract\nTitle: 6d Cardy f
ormulas\n\nAbstract: In this talk\, I will discuss the supersymmetric part
ition functions of 6d SCFTs on R^4 X T^2 and S^5 X S^1 by focusing on thei
r Cardy limit asymptotics. For a 6d SCFT on N M5-branes\, the Cardy free e
nergy is 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 ex
plain the two different approaches to obtain 6d Cardy formulas: the ellipt
ic genus of self-dual strings and the 't Hooft anomalies.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Futoshi Yagi (Southwest Jiaotong University)
DTSTART:20200520T070000Z
DTEND:20200520T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/3
DESCRIPTION:Title: Complete prepotential for 5d N = 1 superconformal field t
heories\nby Futoshi Yagi (Southwest Jiaotong University) as part of St
rings and QFTs for Eurasian time zone\n\n\nAbstract\nTitle:\nComplete prep
otential for 5d N = 1 superconformal field theories\n\nAbstract: \nIn gene
ral\, five dimensional (5d) supersymmetric gauge theory can be understood
as a deformation of the superconformal field theory (SCFT) realized at the
ultraviolet fixed point. The deformation parameters are interpreted as th
e masses and the gauge coupling constants of the gauge theory. However\, f
rom the viewpoint of the SCFT\, it is natural to extend the parameter regi
on to the place where the original gauge theory description is not valid a
nymore. For example\, we can consider the parameter region where the squar
e of the gauge coupling constant becomes negative. If we choose such param
eter region\, the theory may flow to a different gauge theory or may flows
to a non-Lagrangian theory at the infrared.\nWe propose the “complete
” prepotential for 5d N=1 SCFT\, which is valid for the whole parameter
region. The complete prepotential is constructed in such a way that it res
pects the global symmetry of the SCFT and that it reduces to the perturbat
ive prepotential found by Intriligator\, Morrison and Seiberg in the param
eter region where the gauge theory description is valid. The (p\,q) 5-bran
e web diagram plays an important role to understand the complete prepotent
ial.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Meng-Chwan Tan (National University of Singapore)
DTSTART:20200527T070000Z
DTEND:20200527T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/4
DESCRIPTION:Title: Unifying lattice models\, links and quantum geometric Lan
glands via branes in string theory\nby Meng-Chwan Tan (National Univer
sity of Singapore) as part of Strings and QFTs for Eurasian time zone\n\n\
nAbstract\nI will explain how\, starting with a stack of D4-branes ending
on an NS5-brane in type IIA string theory\, one can\, via T-duality and th
e topological-holomorphic nature of the relevant worldvolume theories\, re
late (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 usi
ng 4d N = 4 gauge theory and its quantum group modification\, and (iv) the
Gaitsgory-Lurie conjecture relating quantum groups/affine Kac-Moody algeb
ras to Whittaker D-modules/W-algebras. This furnishes\, purely physically
via branes in string theory\, a novel bridge between the mathematics of in
tegrable systems\, geometric topology\, geometric representation theory\,
and quantum algebras.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Abhijit Gadde (TIFR\, Mumbai)
DTSTART:20200603T070000Z
DTEND:20200603T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/5
DESCRIPTION:Title: Modularity of supersymmetric partition functions\nby
Abhijit Gadde (TIFR\, Mumbai) as part of Strings and QFTs for Eurasian tim
e zone\n\n\nAbstract\nIn this talk\, I will present a novel modular proper
ty of 4d N=1\nsupersymmetric partition functions of supersymmetric theorie
s with\nR-symmetry. It is a generalization of the modular invariance of th
e\nsupersymmetric partition function of two-dimensional supersymmetric\nth
eories on a torus i.e. of the elliptic genus. It comes from\nrequiring con
sistency of partition functions under gluing and\, among\nother things\, c
an be used to rederive the supersymmetric Cardy formula\nfor four-dimensio
nal gauge theories that has played a key role in\ncomputing the entropy of
supersymmetric black holes.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Takahiro Nishinaka (Ritsumeikan University)
DTSTART:20200722T070000Z
DTEND:20200722T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/6
DESCRIPTION:Title: Argyres-Douglas theories\, S-duality and AGT corresponden
ce\nby Takahiro Nishinaka (Ritsumeikan University) as part of Strings
and QFTs for Eurasian time zone\n\n\nAbstract\nArgyres-Douglas (AD) CFTs a
re a series of 4d N=2 superconformal field theories with Coulomb branch op
erators of fractional scaling dimensions. Since they are strongly coupled\
, it is hard to compute the partition function of AD CFTs and their cousin
s via the supersymmetric localization. In this talk\, I will discuss compu
ting the partition function of gauge theories involving Argyres-Douglas CF
Ts in their matter sector\, using the generalized AGT correspondence as a
tool. Our result is particularly consistent with the S-duality when the ga
uging is exactly marginal.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shlomo Razamat (Technion\, Israel)
DTSTART:20200617T070000Z
DTEND:20200617T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/7
DESCRIPTION:Title: SQCD and pairs of pants\nby Shlomo Razamat (Technion\
, Israel) as part of Strings and QFTs for Eurasian time zone\n\n\nAbstract
\nWe will show that minimally supersymmetric SU(N+2) SQCD models in the mi
ddle of the conformal window can be engineered by compactifying certain 6d
SCFTs on three punctured spheres.\nThe geometric construction of the 4d t
heories predicts numerous interesting strong coupling effects\, such as IR
symmetry enhancements and duality. We will discuss this interplay \nbetwe
en simple geometric and group theoretic considerations and complicated fie
ld theoretic strong coupling phenomena. For example\, one of the dualities
arising geometrically from \ndifferent pair-of-pants decompositions of a
four punctured sphere is an $SU(N+2)$ generalization of the Intriligator-
Pouliot duality of $SU(2)$ SQCD with $N_f=4$\, which is a degenerate\, $N=
0$\, instance of our discussion.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Aninda Sinha (IISc\, Bangalore)
DTSTART:20200715T070000Z
DTEND:20200715T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/8
DESCRIPTION:Title: Relative entropy in scattering and the S-matrix bootstrap
\nby Aninda Sinha (IISc\, Bangalore) as part of Strings and QFTs for E
urasian time zone\n\n\nAbstract\nAbstract: I will talk about how relative
entropy\, a concept in quantum information theory to distinguish two densi
ty matrices\, behaves in 2-2 scattering in quantum field theory\, string t
heory\, chiral perturbation theory and the numerical S-matrix bootstrap. I
n the context of massive quantum field theories\, I will derive high energ
y bounds on relative entropy as well as study the Regge behaviour. One app
lication of such line of questioning will be a general explanation why the
curvature of the Regge trajectory in massive quantum field theories must
be positive. Then I will turn to the S-matrix bootstrap. I will give a bro
ad overview of what this program is about and how to constrain pion scatte
ring with it. Here\, some insight from relative entropy will prove to be h
andy to constrain the space of S-matrices. Finally I will discuss how hypo
thesis testing using relative entropy can prove useful to distinguish S-ma
trices in the space of allowed S-matrices.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sujay Ashok (IMSc\, Chennai)
DTSTART:20200701T070000Z
DTEND:20200701T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/9
DESCRIPTION:Title: Surface Defects from Fractional Branes\nby Sujay Asho
k (IMSc\, Chennai) as part of Strings and QFTs for Eurasian time zone\n\n\
nAbstract\nWe show that the Gukov-Witten monodromy defects of supersymmetr
ic Yang-Mills theory can be realized in perturbative string theory by cons
idering an orbifold background of the Kanno-Tachikawa type and placing sta
cks of fractional D3-branes whose world-volume partially extends along the
orbifold directions. In particular\, we show that turning on a constant b
ackground value for some scalar fields in the closed string twisted sector
s induces a non-trivial profile for the gauge field and one of the complex
scalars of the world-volume theory\, and that this profile exactly matche
s the singular behavior that one expects for a Gukov-Witten surface defect
in the N=4 supersymmetric gauge theory.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Saebyeok Jeong (Rutgers)
DTSTART:20200624T130000Z
DTEND:20200624T140000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/10
DESCRIPTION:Title: Opers\, isomonodromic deformations\, and surface defects
\nby Saebyeok Jeong (Rutgers) as part of Strings and QFTs for Eurasian
time zone\n\n\nAbstract\nOne of interesting discoveries on the four-dimen
sional N=2 gauge theories is their role in the quantum/classical duality\,
in which a problem in quantum regime translates to a classical one in the
other. In particular\, the problem of quantizing the Hitchin integrable s
ystem is related to the problem of holomorphic symplectic geometry of the
moduli space of flat connections on Riemann surfaces and its Lagrangian su
bvarieties. In this talk\, I will present how the N=2 gauge theories with
half-BPS surface defects provide a physical understanding of such a dualit
y. Also if time permits\, I will discuss another version of quantum/classi
cal duality related to isomonodromic deformations of Fuchsian systems\, wh
ich could be understood in a similar field theoretical setting.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marcus Sperling (Yau Center\, Tsinghua)
DTSTART:20200708T070000Z
DTEND:20200708T080000Z
DTSTAMP:20260404T110832Z
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 Eurasian time zone\n\n\nAbstract\nMagnetic quivers and Hasse diagrams
have recently been developed to study gauge theories with 8 supercharges
at UV fixed points. For a given low-energy gauge theory realised via a Ty
pe II brane construction\, there exist magnetic quivers for the Higgs bran
ches at finite and infinite gauge coupling. \nComparing these moduli space
s allows to study the non-perturbative effects when transitioning to the f
ixed point. For 5d N=1 SQCD\, 5-brane webs have been an important tool fo
r deriving magnetic quivers. In this talk\, the emphasis is placed on 5-b
rane webs with orientifold 5-planes which give rise to 5d theories with o
rthogonal or symplectic gauge groups. For this set-up\, I will exemplify
the magnetic quiver prescription and contrast it against a unitary magneti
c quiver description extracted from an O7 construction. An important clas
s of families considered are the orthogonal exceptional families\, realise
d as infinite coupling Higgs branches of Sp(k) gauge theories with fundame
ntal matter. For both classes of magnetic quivers\, I will discuss the as
sociated Hasse diagrams for selected examples. Their agreement further val
idates the approach taken.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jie-qiang Wu (MIT)
DTSTART:20200602T140000Z
DTEND:20200602T150000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/12
DESCRIPTION:Title: Peierls bracket and gravitational dressing in Jackiw-Tei
telboim gravity\nby Jie-qiang Wu (MIT) as part of Strings and QFTs for
Eurasian time zone\n\n\nAbstract\nHow to deal with diffeomorphism symmetr
ies is one of the difficult problem in general relativity. Because of the
diffeomorphism symmetries\, we need to consider diffeomorphism invariant o
perators and gravitational dressing. In this work\, we try to use Peierls
bracket to study the commutator between the gravitational dressing operato
r and the ADM energy operator. Our result also strengthens the Marolf-Polc
hinski firewall argument. \nIn the talk\, I will first briefly review the
Peierls bracket\, which is a linear response interpretation of bracket com
putation in covariant phase space formalism. We also illustrate the Peierl
s bracket with several examples. After that\, we use Peierls bracket to st
udy the Hamiltonian flow of the gravitational dressing operator\, from whi
ch we can read out the commutator between the gravitational dressing opera
tor with ADM energy operator.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alex Belin (CERN)
DTSTART:20200622T130000Z
DTEND:20200622T140000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/13
DESCRIPTION:Title: Gravitational path integral from the T2 deformation\
nby Alex Belin (CERN) as part of Strings and QFTs for Eurasian time zone\n
\n\nAbstract\nWe study a T2 deformation of large N conformal field theorie
s\, a higher dimensional generalization of the TT¯ deformation. The defor
med partition function satisfies a flow equation of the diffusion type. We
solve this equation by finding its diffusion kernel\, which is given by t
he Euclidean gravitational path integral in d+1 dimensions between two bou
ndaries with Dirichlet boundary conditions for the metric. This is natural
given the connection between the flow equation and the Wheeler-DeWitt equ
ation\, on which we offer a new perspective by giving a gauge-invariant re
lation between the deformed partition function and the radial WDW wave fun
ction. An interesting output of the flow equation is the gravitational pat
h integral measure which is consistent with a constrained phase space quan
tization. Finally\, we comment on the relation between the radial wave fun
ction and the Hartle-Hawking wave functions dual to states in the CFT\, an
d propose a way of obtaining the volume of the maximal slice from the T2 d
eformation.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Noppadol Mekareeya (INFN\, Milan Bicocca)
DTSTART:20200902T070000Z
DTEND:20200902T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/14
DESCRIPTION:Title: 3d mirrors of the circle reduction of twisted A_{2N} the
ories of class S\nby Noppadol Mekareeya (INFN\, Milan Bicocca) as part
of Strings and QFTs for Eurasian time zone\n\n\nAbstract\nMirror symmetry
is a powerful tool to investigate properties of higher dimensional SCFTs
upon compactification to three dimensions. In this talk\, we propose a pre
scription for constructing 3d mirrors of the circle reduction of twisted A
_{2N} theories of class S. Several explicit examples that provide non-triv
ial tests 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
original 4d theories\, including the presence of massive deformations lea
ding to supersymmetry enhancements. As a by-product of our construction\,
we propose non-trivial dualities between quiver theories with mixed unitar
y\, symplectic and special orthogonal gauge groups and those with unitary
groups only.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hee-Cheol Kim (POSTECH)
DTSTART:20200729T070000Z
DTEND:20200729T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/15
DESCRIPTION:Title: Branes and the Swampland\nby Hee-Cheol Kim (POSTECH)
as part of Strings and QFTs for Eurasian time zone\n\n\nAbstract\nI will
talk about a novel idea on the Swampland program that uses consistency of
what lives on the string probes in gravitational theories. The central cha
rges and the levels of current algebras of 2d CFTs on these strings can be
calculated by anomaly inflow mechanism and used to provide constraints on
the supergravity theories based on unitarity of the worldsheet CFT. I wil
l show some of the theories with 8 or 16 supersymmetries\, which are other
wise consistent looking\, belong to the Swampland.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matteo Sacchi (INFN\, Milan Bicocca)
DTSTART:20200826T070000Z
DTEND:20200826T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/16
DESCRIPTION:Title: New dualities from dimensional reductions and uplifts\nby Matteo Sacchi (INFN\, Milan Bicocca) as part of Strings and QFTs for
Eurasian time zone\n\n\nAbstract\nDualities in 4\, 3 and 2 dimensions are
related by different types of dimensional reduction limits. These can be
effectively exploited to find new dualities by either dimensional reductio
n or uplift of already known ones. In this talk\, I will present some exam
ples 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 dualiti
es on a two-sphere with a topological twist. Then\, I will discuss the fou
r-dimensional uplift of the three-dimensional mirror symmetry\, for which
a 4d ancestor wasn't known before.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mauricio Romo (Yau Center\, Tsinghua)
DTSTART:20200805T070000Z
DTEND:20200805T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/17
DESCRIPTION:Title: Exponential Networks: BPS quivers and enumerative invari
ants\nby Mauricio Romo (Yau Center\, Tsinghua) as part of Strings and
QFTs for Eurasian time zone\n\n\nAbstract\nI will present an introduction
of the basics of exponential networks associated to CY 3-folds described b
y conic bundles. I will focus on how one can extract BPS quivers from dege
nerate networks at special points in the parameters and how to use a gener
alization of the nonabelianization map (as defined for spectral networks)
to count 5d BPS states. This is based on joint work with S. Banerjee and P
. Longhi.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dongmin Gang (APCTP)
DTSTART:20200812T070000Z
DTEND:20200812T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/18
DESCRIPTION:Title: M-theoretic genesis of topological phases\nby Dongmi
n Gang (APCTP) as part of Strings and QFTs for Eurasian time zone\n\n\nAbs
tract\nI will talk about a novel way of constructing (2+1)d topological ph
ases using M-theory. \nThey emerge as macroscopic world-volume theory of M
5-branes wrapped on non-hyperbolic 3-manifolds. \nAfter explaining the alg
orithm of extracting modular structures of the topological phase from top
ological data of the 3-manifold\, I will discuss the possibility of full c
lassification of topological orders via the geometrical construction.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hao-Zhi Zhang (SUSTECH)
DTSTART:20200730T130000Z
DTEND:20200730T140000Z
DTSTAMP:20260404T110832Z
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 t
owards the classifications of symmetry protected trivial (SPT) orders and
symmetry enriched topological (SET) orders with unitary finite onsite symm
etries in all dimensions. The first approach is based on the idea of gaugi
ng the symmetry. I will explain this idea for 2d SPT/SET orders in details
. The second approach is based on the boundary-bulk relation. All the info
rmation of a SET order is contained in the bulk.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Si Li (Yau Center\, Tsinghua)
DTSTART:20200923T070000Z
DTEND:20200923T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/21
DESCRIPTION:Title: Open-closed topological B-model via large N\nby Si L
i (Yau Center\, Tsinghua) as part of Strings and QFTs for Eurasian time zo
ne\n\n\nAbstract\nWe describe the coupling of holomorphic Chern-Simons the
ory at large N with Kodaira-Spencer gravity. We explain a new anomaly canc
ellation mechanism at all loops in perturbation theory for open-closed top
ological B-model. At one loop this anomaly cancellation is analogous to th
e Green-Schwarz mechanism. As an application\, we introduce a type I versi
on of Kodaira-Spencer theory in complex dimension 5 and show that it can o
nly be coupled to holomorphic Chern-Simons theory with gauge group SO(32)
at quantum level. This coupled system is conjectured to be a supersymmetri
c localization of type I string theory. This is joint work with Kevin Cost
ello.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yutin Huang (National Taiwan University)
DTSTART:20200806T130000Z
DTEND:20200806T140000Z
DTSTAMP:20260404T110832Z
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
\nAbstract\nA non-trivial S-matrix generally implies a production of entan
glement: starting with an incoming pure state the scattering generally ret
urns an outgoing state with non-vanishing entanglement entropy. It is then
interesting to ask if there exists a non-trivial S-matrix that generates
no entanglement. To this end we study the spin-entanglement in the scatte
ring of arbitrary spinning particles. Augmented with Thomas-Wigner rotatio
n factors\, we derive the entanglement entropy from the gravitational indu
ced 2-> 2 amplitude. In the Eikonal limit\, we find that the relative enta
nglement entropy\, defined as the difference between the entanglement entr
opy of the in and out-states\, is nearly zero for minimal coupling\, and i
ncreases significantly for any non-vanishing spin multipole moments. This
suggests that minimal couplings of spinning particles\, whose classical li
mit corresponds to Kerr black hole\, has the unique feature of generating
near zero entanglement.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yikun Jiang (Cornell)
DTSTART:20200821T020000Z
DTEND:20200821T030000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/23
DESCRIPTION:Title: Islands in cosmology\nby Yikun Jiang (Cornell) as pa
rt of Strings and QFTs for Eurasian time zone\n\n\nAbstract\nRecent develo
pments in understanding the black hole information paradox have led to the
`quantum extremal island’ prescription for calculating the fine-grained
entropy of a quantum system entangled with gravitational degrees of freed
om. A quantum extremal island suggests that a region of spacetime is encod
ed in the quantum state of another system\, like the encoding of the black
hole interior in Hawking radiation. We study conditions for islands to ap
pear in general spacetimes. They must violate Bekenstein's area bound in a
precise sense (with a simple tensor network picture)\, and the boundary o
f an island must satisfy several quantum information-theoretic inequalitie
s. These conditions combine to impose very strong restrictions\, which we
apply to cosmological models. In this talk\, I will mainly focus on the ex
ample of four-dimensional FRW cosmology with radiation and a negative cosm
ological constant entangled with an auxiliary non-gravitational Minkowski
spacetime in the thermofield double state\, where an island appears near t
he turning point when the geometry begins to recollapse. If time permits\,
I will also briefly explain our results for islands in the two-dimensiona
l models of JT gravity in de Sitter spacetime. The talk will be based on w
ork: 2008.01022 with Thomas Hartman and Edgar Shaghoulian.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Babak Haghighat (Yau Center\, Tsinghua)
DTSTART:20201202T070000Z
DTEND:20201202T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/24
DESCRIPTION:Title: Elliptic Quantum Curves of Class Sk\nby Babak Haghig
hat (Yau Center\, Tsinghua) as part of Strings and QFTs for Eurasian time
zone\n\n\nAbstract\nQuantum curves arise from Seiberg-Witten curves associ
ated to 4d N=2 gauge theories by promoting coordinates to non-commutative
operators. In this way the algebraic equation of the curve is interpreted
as an operator equation where a Hamiltonian acts on a wave-function with z
ero eigenvalue. We find that this structure generalises when one considers
torus-compactified 6d N=(1\,0) SCFTs. The corresponding quantum curves ar
e elliptic in nature and hence the associated eigenvectors/eigenvalues can
be expressed in terms of Jacobi forms. In this talk\, we focus on the cla
ss of 6d SCFTs arising from M5 branes transverse to a C2/Zk singularity. I
n the limit where the compactified 2-torus has zero size\, the correspondi
ng 4d N=2 theories are known as class Sk. We explicitly show that the eige
nvectors associated to the quantum curve are expectation values of codimen
sion 2 surface operators\, while the corresponding eigenvalues are codimen
sion 4 Wilson surface expectation values.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Johanna Knapp (University of Melbourne)
DTSTART:20201021T070000Z
DTEND:20201021T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/25
DESCRIPTION:Title: GLSMs\, localisation\, and the stringy Kahler moduli spa
ce\nby Johanna Knapp (University of Melbourne) as part of Strings and
QFTs for Eurasian time zone\n\n\nAbstract\nGauged linear sigma models (GLS
Ms) can be used to analyse Calabi-Yaus and their moduli spaces. Different
low energy configurations ("phases") of a GLSM describe Calabi-Yaus in dif
ferent\, not necessarily large volume\, regions of the Kahler moduli space
. We provide evidence that the sphere and hemisphere partition functions o
f Calabi-Yau GLSMs\, when evaluated in different types of phases\, have a
universal structure. The main ingredients that enter the result are Givent
al'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. E
rkinger\, M. Romo\, and E. Scheidegger.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/25/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Xin Wang (KIAS)
DTSTART:20201014T070000Z
DTEND:20201014T080000Z
DTSTAMP:20260404T110832Z
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\nS
ix is the highest dimension in which representation theory allows for inte
racting superconformal field theories (SCFTs). By considering F-theory com
pactifications on elliptic non-compact Calabi-Yau three-folds\, those 6d (
1\,0) SCFTs are completely classified. Their BPS partition functions are c
aptured by the elliptic genera of the corresponding world-sheet theories.
In this talk\, I will introduce novel functional equations for the BPS par
tition functions for all 6d (1\,0) SCFTs along the classifications\, we ca
ll these equations "Elliptic blowup equations"\, which can be formally der
ived from the perturbative inputs of topological string partition function
s on the same Calabi-Yau three-folds\, based on the blowup equations for r
efined topological strings. Specifically\, for the rank one cases in the t
ensor branch\, we developed various methods to solve the elliptic genera f
rom the elliptic blowup equations\, solved the elliptic genera for almost
all rank one theories completely.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/26/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kohei Iwaki (University of Tokyo)
DTSTART:20201028T070000Z
DTEND:20201028T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/27
DESCRIPTION:Title: Topological recursion and uncoupled BPS structure arisin
g from spectral curves of hypergeometric type\nby Kohei Iwaki (Univers
ity of Tokyo) as part of Strings and QFTs for Eurasian time zone\n\n\nAbst
ract\nI will discuss a relationship between the following two objects defi
ned from the spectral curves of hypergeometric differential equation and i
ts confluent degenerations: The free energy compute by Eynard-Orantin's t
opological recursion\, and BPS spectrum (degeneration of spectral networks
) for the corresponding quadratic differentials computed by the algorithm
of Gaiotto-Moore-Neitzke / Bridgeland-Smith. In particular\, I’ll show a
simple formula expressing the topological recursion free energies as a su
m over BPS states. My talk is based on a joint work with O. Kidwai.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/27/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kwok Wai Chan (Chinese University of Hong Kong)
DTSTART:20201104T070000Z
DTEND:20201104T080000Z
DTSTAMP:20260404T110832Z
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 zone\n\n\nAbstract\nI will report on recent joint works with Conan Le
ung and Qin Li on some new relations between deformation quantization\, ge
ometric quantization\, Berezin-Toeplitz quantization and BV quantization o
n Kahler manifolds\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/28/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jaewon Song (KAIST)
DTSTART:20200909T070000Z
DTEND:20200909T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/29
DESCRIPTION:Title: Classification of large N superconformal gauge theories
and the Weak Gravity Conjecture\nby Jaewon Song (KAIST) as part of Str
ings and QFTs for Eurasian time zone\n\n\nAbstract\nWe classify the large
N limits of four-dimensional supersymmetric gauge theories with simple gau
ge groups 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-
invariant operators. The central charges a and c for the dense theories gr
ow linearly in N in contrast to the N^2 growth for the theories with a spa
rse spectrum. 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 m
atter content for the fixed point theory to possess either a dense or spar
se spectrum. We discover a few curious aspects regarding supersymmetric RG
flows and a-maximization along the way. For all the theories with the den
se spectrum\, the AdS version of the Weak Gravity Conjecture (including th
e convex hull condition for the cases with multiple U(1)'s) holds for larg
e enough N even though they do not have weakly-coupled gravity duals.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/29/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hiroshi Iritani (Kyoto University)
DTSTART:20201125T070000Z
DTEND:20201125T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/30
DESCRIPTION:Title: Gamma conjecture for Fano and Calabi-Yau manifolds\n
by Hiroshi Iritani (Kyoto University) as part of Strings and QFTs for Eura
sian time zone\n\n\nAbstract\nThe Gamma conjecture is a conjecture about t
he relationship \nbetween quantum cohomology and a characteristic class ca
lled the \nGamma class. In this talk\, I will give an introduction to this
conjecture \nand explain the relationship to mirror symmetry. I will focu
s on the Fourier-Laplace \nduality between the Gamma conjectures for Fano
and Calabi-Yau manifolds.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/30/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yuya Tanizaki (Kyoto University)
DTSTART:20200930T070000Z
DTEND:20200930T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/32
DESCRIPTION:Title: Topological aspects of oblique confinement in the Cardy-
Rabinovici model\nby Yuya Tanizaki (Kyoto University) as part of Strin
gs and QFTs for Eurasian time zone\n\n\nAbstract\nConfinement is one of th
e most important but basic features of non-Abelian gauge theories\, and an
intuitive and interesting scenario of its dynamics is condensation of mag
netic monopoles. When we add the topological theta term to it\, more exoti
c condensations 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 topol
ogical nature based on the recent applications of 't Hooft anomaly matchin
g. Moreover\, it has been known that the local dynamics of Cardy-Rabinovic
i model shows the SL(2\,Z) self-duality\, but it turns out that the self-d
uality does not extend to the global aspect of the original theory. We coo
ked up a SL(2\,Z) self-dual theory by gauging a part of the 1-form symmetr
y of the Cardy-Rabinovici model\, and the self-duality has a mixed gravita
tional anomaly. These data give useful constraints to discuss the phase di
agram.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/32/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yasunori Lee (University of Tokyo)
DTSTART:20201216T070000Z
DTEND:20201216T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/33
DESCRIPTION:Title: Revisiting Wess-Zumino-Witten terms\nby Yasunori Lee
(University of Tokyo) as part of Strings and QFTs for Eurasian time zone\
n\n\nAbstract\nWe revisit various topological issues concerning 4d Wess-Zu
mino-Witten terms for SU and SO QCD\, from the modern bordism point of vie
w. We explain why the definition of the 4d WZW terms requires the spin str
ucture\, and also discuss how the mixed anomaly involving the 1-form symme
try of SO QCD is reproduced in the low-energy sigma model.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/33/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sunghyuk Park (Caltech)
DTSTART:20201209T070000Z
DTEND:20201209T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/34
DESCRIPTION:Title: 3-manifolds\, q-series\, and topological strings\nby
Sunghyuk Park (Caltech) as part of Strings and QFTs for Eurasian time zon
e\n\n\nAbstract\nZ-hat\, also known as the homological block\, is an invar
iant of 3-manifolds valued in BPS q-series introduced by Gukov\, Putrov an
d 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 incl
uding the use of R-matrix for Verma modules\, generalization to higher ran
k\, the large N-limit and interpretation as open topological string partit
ion functions.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/34/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zhihao Duan (KIAS)
DTSTART:20201223T070000Z
DTEND:20201223T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/35
DESCRIPTION:Title: Fermionic rational CFTs and Modular Linear Differential
Equations\nby Zhihao Duan (KIAS) as part of Strings and QFTs for Euras
ian time zone\n\n\nAbstract\nIn this talk\, I will revisit the idea of cla
ssifying rational conformal field theories (CFTs) from modular linear diff
erential equations (MLDEs). I will start by reviewing what is known in the
bosonic setup\, and then generalize it to fermionic cases. In particular\
, I will define fermionic MLDEs and use them to classify fermionic rationa
l CFTs with small number of characters. Properties of theories we found wi
ll be discussed and analyzed. This talk is based on arXiv: 2010.12392 and
some results to appear.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/35/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Keita Nii (YITP\, Kyoto)
DTSTART:20201230T070000Z
DTEND:20201230T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/36
DESCRIPTION:Title: Generalized Giveon-Kutasov duality\nby Keita Nii (YI
TP\, Kyoto) as part of Strings and QFTs for Eurasian time zone\n\n\nAbstra
ct\nIn this talk\, I will propose a generalized version of the conventiona
l\nGiveon-Kutasov duality.\nThis generalization includes a fully-generaliz
ed Chern-Simons\ninteraction for the U(N) gauge group.\nIn addition\, this
generalization unfies the SU(N) and U(N)\nChern-Simons matter dualities i
nto a single duality.\nAs an application of this duality\, we can see dual
ity enhancement for\nthe abelican cases.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/36/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dongwook Ghim (KIAS)
DTSTART:20210113T070000Z
DTEND:20210113T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/37
DESCRIPTION:Title: 5d BPS quivers and KK towers\nby Dongwook Ghim (KIAS
) as part of Strings and QFTs for Eurasian time zone\n\n\nAbstract\nIn thi
s talk\, I will present recent progress in computing (refined) Witten inde
x of BPS quiver for 5d gauge theories\, compactified on a circle. With str
ingy BPS objects in 5d theory being wrapped on the circle\, the wall-cross
ing problem of 4d KK theory can be addressed by N=4 quiver quantum mechani
cs. However\, the fine-tuned superpotential of the latter makes many of th
e known machinery fail to capture its indices. I will show how the subtlet
y can be bypassed for a restricted class of BPS quivers. \n\nSpecifically\
, I will construct the entire KK tower of Cartan components in vector mult
iplets\, based on L2 cohomology counting and D0 brane picture. Then the an
alysis will be extended to purely electric BPS particles without magnetic
or instanton charges in the weak coupling chamber.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/37/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Aswin Balasubramanian (Rutgers)
DTSTART:20210127T070000Z
DTEND:20210127T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/38
DESCRIPTION:Title: Families of Hitchin system\, N=2 theories and the Delign
e-Simpson problem\nby Aswin Balasubramanian (Rutgers) as part of Strin
gs and QFTs for Eurasian time zone\n\n\nAbstract\nMotivated by the relatio
n to 4d N=2 theories\, I will describe tame SL_N Hitchin integrable system
s as flat families over \\bar{M}\, the Deligne-Mumford moduli space associ
ated to the underlying Riemann surface. Then\, I will use this description
to clarify certain questions about the behaviour of the Coulomb branches
of these N=2 theories near the boundaries of \\bar{M}. As a further applic
ation of the setup\, I will describe an interesting relationship between C
lass 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://stable.researchseminars.org/talk/StringQFTEurasian/38/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yutaka Matsuo (University of Tokyo)
DTSTART:20210203T070000Z
DTEND:20210203T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/39
DESCRIPTION:Title: q-Deformation of Corner Vertex Operator Algebras by Miur
a Transformation\nby Yutaka Matsuo (University of Tokyo) as part of St
rings and QFTs for Eurasian time zone\n\n\nAbstract\nRecently\, Gaiotto an
d Rapcak proposed a generalization of WN algebra by considering the symmet
ry at the corner of the brane intersection (corner vertex operator algebra
). The algebra\, denoted as YL\,M\,N\, is characterized by three non-negat
ive integers L\,M\,N. It has a manifest triality automorphism which interc
hanges L\,M\,N\, and can be obtained as a reduction of W1+∞ through a "p
it" in the plane partition representation. \nLater\, Prochazka and Rapcak
proposed a representation of YL\,M\,N in terms of L+N+M free bosons throug
h a generalization of Miura transformation\, where they use the fractional
power differential operators. \nIn this paper\, we derive a q-deformation
of their Miura transformation. It gives the free field representation for
q-deformed YL\,M\,N\, which is obtained as a reduction of the quantum tor
oidal algebra. We find that the q-deformed version has a "simpler" structu
re than the original one because of the Miki duality in the quantum toroid
al algebra. For instance\, one can find a direct correspondence between th
e operators obtained by the Miura transformation and those of the quantum
toroidal algebra. Furthermore\, we can show that the screening charges of
both the symmetries are identical.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/39/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jirui Guo (Yau Center\, Tsinghua)
DTSTART:20210224T070000Z
DTEND:20210224T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/40
DESCRIPTION:Title: A GLSM view on homological projective duality\nby Ji
rui Guo (Yau Center\, Tsinghua) as part of Strings and QFTs for Eurasian t
ime zone\n\n\nAbstract\nHomological projective duality (HPD) is a generali
zation of projective duality at the categorical level. It has been noticed
that different phases of some gauged linear sigma models are related by H
PD. Given a projective embedding\, this duality can be formulated explicit
ly by constructing a GLSM describing the universal hyperplane section. I w
ill outline the structure and application of this type of GLSM in this tal
k. It can be shown\, by analysis of brane transport\, that the HPD is real
ized by the Higgs branch of one of the phases. Application of this formula
tion to examples such as Veronese embedding\, quadrics\, complete intersec
tions and Plucker embedding reproduces existing mathematical results and p
rovides descpritions of new HPDs. It also explains why\, in many cases\, t
wo phases of a GLSM are related by homological projective duality.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/40/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yegor Zenkevich (ITEP)
DTSTART:20210217T070000Z
DTEND:20210217T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/41
DESCRIPTION:Title: On the structure of elliptic Ding-Iohara-Miki algebra\nby Yegor Zenkevich (ITEP) as part of Strings and QFTs for Eurasian time
zone\n\n\nAbstract\nElliptic Ding-Iohara-Miki (DIM) algebra is an ellipti
c deformation of\nthe trigonometric DIM algebra\, in which the commutators
of the\ngenerating currents are expressed through Jacobi theta functions.
This\nalgebra plays the key role in the generalization of the AGT relatio
ns\nto six-dimensional gauge theories and elliptic Virasoro algebras. We\n
prove that the elliptic DIM algebra is in fact isomorphic to a direct\nsum
of a trigonometric DIM algebra and an extra Heisenberg algebra. We\nalso
discuss the representation theory\, R-matrix and intertwiners for\nthe ell
iptic algebra.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/41/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Oren Bergman (Technion)
DTSTART:20210317T070000Z
DTEND:20210317T080000Z
DTSTAMP:20260404T110832Z
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\nA
bstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/42/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Seung-Joo Lee (IBS)
DTSTART:20210407T070000Z
DTEND:20210407T080000Z
DTSTAMP:20260404T110832Z
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\nAbstract\nThis talk aims to study the way string theory realizes variou
s conjectures on quantum gravity. Starting with the F-theory description o
f a gauge theory coupled to gravity\, we will first analyze the limit in K
ähler moduli space where the gauge coupling tends to zero while gravity i
s kept dynamical. In such a limit a key observation will be made about the
appearance of a tensionless string. Focusing on U(1) gauge dynamics for c
oncreteness\, we will look into the elliptic genus of this string in terms
of certain meromorphic weak Jacobi forms\, of which modular properties al
low us to determine the charge-to-mass ratios of certain string excitation
s. A tower of these asymptotically massless charged states will then be co
nfirmed to satisfy the (sub-)Lattice Weak Gravity Conjecture\, the Complet
eness Conjecture\, and the Swampland Distance Conjecture.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/45/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sam Crew (Cambridge)
DTSTART:20210303T080000Z
DTEND:20210303T090000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/46
DESCRIPTION:Title: Hemisphere blocks of 3d N=4 quiver gauge theories\nb
y Sam Crew (Cambridge) as part of Strings and QFTs for Eurasian time zone\
n\n\nAbstract\nI will discuss geometric and representation theoretic aspec
ts of hemisphere partition functions and vortices in 3d N=4 gauge theories
. In particular\, I will talk about recent work in which we revisit holomo
rphic factorisation in terms of hemisphere partition functions and introdu
ce new formulae for various three manifold partition functions in terms of
characters of Higgs and Coulomb quantised chiral rings. As a particular e
xample\, I will discuss a theory described by the ADHM quiver in the prese
nce of a line operator and discuss Verma and simple modules of the relevan
t chiral ring.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/46/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yutaka Yoshida (IPMU\, University of Tokyo)
DTSTART:20210331T070000Z
DTEND:20210331T080000Z
DTSTAMP:20260404T110832Z
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\nW
e evaluate the vacuum expectation values of half-BPS 't Hooft operators i
n supersymmetric gauge theories with eight supercharges in three\, four\,
and five dimensions in terms of supersymmetric localization. \n\nIn local
ization formulas\, there exist non-perturbative contributions from the mo
duli of Dirac monopoles screened by 't Hooft-Polyakov monopoles\, called m
onopole bubbling effects (a.k.a. monopole screening effects). \n\nBy intro
ducing orientifolds\, we generalize the brane construction of monopole bub
bling effects for SU(N) gauge theories to SO(N) and USp(N) gauge theories.
\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/47/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jihwan Oh (Oxford)
DTSTART:20210414T080000Z
DTEND:20210414T090000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/48
DESCRIPTION:Title: Twisted holography of M2 and M5 branes\nby Jihwan Oh
(Oxford) as part of Strings and QFTs for Eurasian time zone\n\n\nAbstract
\nI will review a recent development of twisted holography\, pioneered by
Kevin Costello. Main examples will be twisted M-theory with M2 branes and
M5 branes. After describing the Omega deformed and topologically twisted b
ackground\, I will discuss how to extract operator algebras of both sides
of the twisted M-theory and draw an isomorphism between them. The operator
algebras of M2 and M5 branes are subalgebras of affine gl(1) Yangian. I w
ill explain how we can understand fusions of the algebras in the gravity s
ide\, based on my work with Yehao Zhou\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/48/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rui-Dong Zhu (Soochow University)
DTSTART:20210310T080000Z
DTEND:20210310T090000Z
DTSTAMP:20260404T110832Z
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 E
urasian time zone\n\n\nAbstract\nWe propose an extended form of the topolo
gical vertex formalism that applies to (p\,q)-brane web with orientifolds\
, by analyzing the geometric transition of Kim-Yagi’s prescription. A ne
w topological vertex with only one leg is introduced into the formalism fo
r the intersection of (2\,1)-brane and the O-plane\, and we assign a verte
x operator to this intersection point in our proposal. We show the consist
ency of this extended formalism and discuss its potential future usage in
the study of SO(N) gauge theories etc.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/49/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kaiwen Sun (KIAS)
DTSTART:20210421T070000Z
DTEND:20210421T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/50
DESCRIPTION:Title: RG Flows\, Dualities and 5d Blowup Equations with Matter
s\nby 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
) blowup equations -- both unity and vanishing. In particular\, we find th
e full set of blowup equations for all rank one\, two\, three and many hig
her rank 5d $\\mathcal{N}=1$ gauge theories and all exceptional gauge theo
ries. Our strategy is starting from 5d Kaluza-Klein (KK) theories compacti
fied from 6d SCFTs and translating all elliptic blowup equations to K-theo
retic blowup equations. Then we reduce the blowup equations by decoupling
once at a time the hypermultiplets in various representations. Interesting
ly\, for rank higher than one theories\, along one single renormalization
group (RG) flow one does not always obtain all blowup equations from the u
pstream theories. Instead\, each 5d theory inherits blowup equations from
all its parental theories in the flow web. We find the 5d dualities are hi
ghly non-trivially reflected in the map among blowup equations. We also st
udy the blowup equations near the 5d SCFT point and find the enhanced glob
al symmetry appears naturally. In particular\, all $r$ fields form Weyl or
bits of enhanced flavor group in the lattice of invariant Coulomb paramete
rs.\n
LOCATION:https://stable.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:20260404T110832Z
UID:StringQFTEurasian/52
DESCRIPTION:Title: Bootstrapping BPS spectra of 5d/6d supersymmetric field
theories\nby Sung-Soo Kim (University of Electronic Science and Techno
logy of China) as part of Strings and QFTs for Eurasian time zone\n\n\nAbs
tract\nIn this talk\, we discuss a systematic approach to computing the BP
S spectra of any 5d/6d supersymmetric quantum field theory in Coulomb phas
es\, based on the Nakajima-Yoshioka’s blowup equations. We generalize th
e blowup 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 background. We compute BPS spectra of all rank-1 and rank-2 5d KK th
eories descending from 6d N=(1\,0) superconformal field theories compactif
ied on a circle with/without twist.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/52/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Minsung Kim (POSTECH)
DTSTART:20210714T070000Z
DTEND:20210714T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/53
DESCRIPTION:Title: 5d/6d Wilson loops from blowups\nby Minsung Kim (POS
TECH) as part of Strings and QFTs for Eurasian time zone\n\n\nAbstract\nRe
cently\, BPS spectra of large class of 5d and 6d supersymmetric quantum fi
eld theories are computed via blowup equation. In this talk\, we generaliz
e the blowup formula to calculate the partition function of 5d/6d field th
eories on Omega-background in presence of Wilson loop/Wilson surface opera
tors or codimension-4 defects. We test this approach by calculating their
partition functions in various 5d/6d field theories and comparing with kno
wn results and expected dualities.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/53/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mayuko Yamashita (RIMS)
DTSTART:20210721T070000Z
DTEND:20210721T080000Z
DTSTAMP:20260404T110832Z
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\nAbstract\nFreed and Hopkins conjectured that the deformation classes
of\nnon-topological invertible quantum field theories are classified by a
\ngeneralized cohomology theory called the Anderson dual of bordism\ntheor
ies.\nTwo of the main difficulty of this problem are the following.\nFirst
\, we do not have the axioms for QFT’s.\nSecond\, The Anderson dual is d
efined in an abstract way.\nIn this talk\, I will explain our results (arX
iv:2106.09270) to give a new\napproach to this conjecture\, in particular
to overcome the second\ndifficulty above.\nWe construct a new\, physically
motivated model for the Anderson duals.\nThis model is constructed so tha
t it abstracts a certain property of inverti\nble QFT’s which physicists
believe to hold in general.\nI will start from basic motivations for the
classification problem\, report\nthe progress of our work and explain futu
re directions.\nThis is the joint work with Kazuya Yonekura (Tohoku\, phys
ics).\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/54/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Myungbo Shim (Kyung Hee University)
DTSTART:20210915T070000Z
DTEND:20210915T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/55
DESCRIPTION:Title: Non-unitary TQFTs from 3D N=4 rank-0 SCFTs\nby Myung
bo Shim (Kyung Hee University) as part of Strings and QFTs for Eurasian ti
me zone\n\n\nAbstract\nWe propose a novel procedure of assigning a pair of
non-unitary topological quantum field theories (TQFTs)\, TFT$_\\pm [\\CT_
{\\rm rank \\\;0}]$\, to a (2+1)D interacting $\\CN=4$ superconformal fiel
d theory (SCFT) $\\CT_{\\rm rank \\\;0}$ of rank 0\, i.e.\\ having no Coul
omb and Higgs branches. The topological theories arise from particular deg
enerate limits of the SCFT. Modular data of the non-unitary TQFTs are ex
tracted from the supersymmetric partition functions in the degenerate l
imits. 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 fir
st column in the modular S-matrix of TFT$_\\pm$. From the dictionary\,
we derive 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 S
CFT. The bound is saturated by the minimal $\\CN=4$ SCFT proposed by Gang-
Yamazaki\, whose associated topological theories are both the Lee-Yang TQF
T. We explicitly work out the (rank 0 SCFT)/(non-unitary TQFTs) correspond
ence for infinitely many examples.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/55/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yosuke Imamura (Tokyo Institute of Technology)
DTSTART:20211013T070000Z
DTEND:20211013T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/56
DESCRIPTION:Title: Finite-N superconformal index via the AdS/CFT correspond
ence'\nby Yosuke Imamura (Tokyo Institute of Technology) as part of St
rings and QFTs for Eurasian time zone\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/56/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Akimi Watanabe (University of Tokyo)
DTSTART:20220126T070000Z
DTEND:20220126T080000Z
DTSTAMP:20260404T110832Z
UID:StringQFTEurasian/57
DESCRIPTION:Title: Quiver Quantum Toroidal Algebra and Crystal Representati
ons\nby Akimi Watanabe (University of Tokyo) as part of Strings and QF
Ts for Eurasian time zone\n\n\nAbstract\nThis talk is based on arxiv:2108.
07104 and 2109.02045.\nWe propose a new class of algebras\, Quiver Quantum
Toroidal Algebra\, a generalization of Quantum Toroidal $gl_1$. It is kno
wn that Quantum Toroidal $gl_1$ has representations by 1d\, 2d\, and 3d Yo
ung diagrams. (Shifted) Quiver Quantum Toroidal Algebra acts on more gener
al 1d\, 2d\, and 3d crystals. We study the way of constructing 2d crystal
s representations from 1d crystals representations.\n
LOCATION:https://stable.researchseminars.org/talk/StringQFTEurasian/57/
END:VEVENT
END:VCALENDAR