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BEGIN:VEVENT
SUMMARY:David Osten (Ludwig Maximilian University/Max-Planck-Institute for
Physics\, Munich)
DTSTART:20200624T150000Z
DTEND:20200624T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/1
DESCRIPTION:Title: Current Algebra and Generalised Geometry\nby David Osten (Ludwig M
aximilian University/Max-Planck-Institute for Physics\, Munich) as part of
Theoretical and Mathematical Physics\n\n\nAbstract\nThe first part of the
talk will be a review of T-duality and generalised geometry in string the
ory. Generalised geometry is a generalisation of Riemannian geometry that
captures certain 'non-geometric' backgrounds which are nevertheless well-d
efined in string theory. A convenient characterisation of such backgrounds
is given in terms of the so-called generalised fluxes.\n\nIn the second p
art of the talk I want to discuss the meaning of these generalised fluxes
in the worldsheet theory. There\, they describe a deformation of the canon
ical Poisson structure -- namely the current algebra. Besides applications
to magnetic backgrounds and integrable sigma models which motivated this
work\, the virtue of the deformed current algebra lies in the fact that it
gives clear-cut routes to non-commutative and non-associative interpretat
ions of the generalised flux backgrounds\, to generalisations of T-duality
and to generalisations to M-theory.\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Frederic Bruenner (Vienna University of Technology (TU Wien))
DTSTART:20200708T150000Z
DTEND:20200708T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/2
DESCRIPTION:Title: Gauge/gravity duality and the phenomenology of hadrons\nby Frederi
c Bruenner (Vienna University of Technology (TU Wien)) as part of Theoreti
cal and Mathematical Physics\n\n\nAbstract\nI will give a pedagogical intr
oduction to aspects of hadronic physics at low energy\, and show how the m
ethodology of gauge/gravity duality may be applied to certain problems ari
sing in this context. As a concrete example\, I will talk about the search
for glueballs\, bound states of gluons predicted by lattice gauge theory.
These states have not been identified unambiguously among the hadrons we
observe in collider experiments\, in part due to the lack of theoretical p
redictions of their decay rates. I will show how gauge/gravity duality can
be used to calculate glueball decay rates\, and discuss potential implica
tions.\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jose Alejandro Rosabal (Asia Pacific Center for Theoretical Physic
s\, Pohang)
DTSTART:20200722T110000Z
DTEND:20200722T130000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/3
DESCRIPTION:Title: Schwarzschild black hole thermodynamic entropy on a nice slice\nby
Jose Alejandro Rosabal (Asia Pacific Center for Theoretical Physics\, Poh
ang) as part of Theoretical and Mathematical Physics\n\n\nAbstract\nIn thi
s seminar I will present the calculation of the thermodynamic entropy of a
Schwarzschild black hole on a nice slice. This can be seen as a warm up t
o address the calculation of the Von Neumann entropy for two intervals\, t
hat includes a portion of the interior of the black hole\, and the Page cu
rve. In the end I will comment on the relation between this work and some
recent proposal.\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nikita Kolganov (ITMP MSU\, Moscow)
DTSTART:20200923T150000Z
DTEND:20200923T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/4
DESCRIPTION:Title: Constrained modified gravities: generalized unimodular gravity and bey
ond\nby Nikita Kolganov (ITMP MSU\, Moscow) as part of Theoretical and
Mathematical Physics\n\n\nAbstract\nIn my talk\, I will give you a brief
introduction into modified gravity theories\, and then I will proceed to p
articular modified gravity models\, which I'm interested in. Most of the m
odified gravities are equivalent to the General Relativity\, equipped with
some additional degrees of freedom. In our case these d.o.f. are obtained
by the explicit breaking of general covariance by an algebraic constraint
on metric coefficients. I'm going to discuss the covariantization issue o
f such theories\, its duality to well-known k-essence and self-gravitating
media models\, and applications to inflationary cosmology.\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gleb Arutyunov (University of Hamburg)
DTSTART:20200930T150000Z
DTEND:20200930T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/5
DESCRIPTION:Title: Hamiltonian structures of the spin Ruijsenaars-Schneider models\nb
y Gleb Arutyunov (University of Hamburg) as part of Theoretical and Mathem
atical Physics\n\n\nAbstract\nTBA\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ariel Arza (ITMP MSU\, Moscow)
DTSTART:20201007T150000Z
DTEND:20201007T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/6
DESCRIPTION:Title: Production of massive particles from the decay of a free massless fiel
d\nby Ariel Arza (ITMP MSU\, Moscow) as part of Theoretical and Mathem
atical Physics\n\n\nAbstract\nIn this talk we will show\, in a simple toy
model (H=g\\phi\\chi^2)\, how Bose enhancement allows the decay of a massl
ess field into massive particles. It happens due to a parametric resonance
caused by a big energy density of the decaying field. I will show the ins
tability conditions as well as the energy density threshold for the decay
to occur. I will also compute the equivalent of the spontaneous decay rate
.\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrei Zotov (Steklov Mathematical Institute RAS)
DTSTART:20201021T150000Z
DTEND:20201021T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/7
DESCRIPTION:Title: On double elliptic integrable system: characteristic determinant and M
anakov triple\nby Andrei Zotov (Steklov Mathematical Institute RAS) as
part of Theoretical and Mathematical Physics\n\n\nAbstract\nWe discuss do
uble elliptic integrable systems\, where the dependence on the momenta of
particles is elliptic. These models generalize the relativistic Ruijsenaar
s integrable systems\, which contain trigonometric (exponential) dependenc
e on momenta. A brief review on underlying dualities and interrelations be
tween integrable systems will be given. We explain how to construct a kind
of determinant representation for the known conservation laws. Finally\,
we will see that in the classical case the double elliptic models are natu
rally described by the Manakov L-A-B triple instead of the Lax pair\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mikhail Khlopunov (ITMP\, Moscow State University)
DTSTART:20201028T150000Z
DTEND:20201028T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/8
DESCRIPTION:Title: Modification of the radiation definition in odd dimensions\nby Mik
hail Khlopunov (ITMP\, Moscow State University) as part of Theoretical and
Mathematical Physics\n\n\nAbstract\nIn this seminar\, I will discuss modi
fication of the radiation definition for the case of odd-dimensional space
-time. The standard definition of the wave zone fails in odd dimensions\,
due to the violation of the Huygens principle: the signal from an instanta
neous flash of current reaches an observer after an interval of time requi
red for propagation of the signal at the speed of light\, but then the tai
l is observed endlessly\; while in even-dimensional spaces an instant sign
al ends instantly at the observation point. The reason is that the retarde
d Green’s functions of the wave equation in odd dimensions has support l
ocalised not only on the light cone\, but also inside it. I will discuss t
he covariant retarded quantities technique and Rohrlich-Teitelboim definit
ion of the wave zone. Using this definition\, the scalar radiation from a
point-like charge\, moving along the circular trajectory in three and five
-dimensional space-times\, will be computed. The obtained results will be
verified by the calculations of the spectral distributions of the radiated
energy\, which are indifferent to the dimensionality of the space-time. A
lso\, the contributions of the tails to the radiation will be discussed.\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexander Zhiboedov (CERN)
DTSTART:20201111T150000Z
DTEND:20201111T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/9
DESCRIPTION:Title: Event shapes\, the light-ray OPE and superconvergence\nby Alexande
r Zhiboedov (CERN) as part of Theoretical and Mathematical Physics\n\n\nAb
stract\nI will describe recent progress in understanding event shapes in c
onformal field theories. Familiar from the description of hadronic events
at colliders\, these observables are computed by matrix elements of the so
-called light-ray operators. Characterizing the light-ray operators in a n
onperturbative setting poses many theoretical challenges. I will describe
some of the recently developed tools to perform computations of conformal
event shapes and illustrate them using N=4 SYM. Finally\, I will explain h
ow via holography some of the basic properties of conformal event shapes l
ead to nontrivial sum rules obeyed by possible UV completions of general r
elativity.\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sandipan Kundu (Johns Hopkins University)
DTSTART:20201118T150000Z
DTEND:20201118T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/10
DESCRIPTION:Title: Closed strings and weak gravity condition from higher-spin causality<
/a>\nby Sandipan Kundu (Johns Hopkins University) as part of Theoretical a
nd Mathematical Physics\n\n\nAbstract\nI will show that metastable higher
spin particles\, free or interacting\, cannot couple to gravity while pres
erving causality unless there exist higher spin states in the gravitationa
l sector much below the Planck scale. Causality imposes an upper bound on
the mass of the lightest higher spin particle in the gravity sector in ter
ms of quantities in the non-gravitational sector. I will argue that any we
akly coupled UV completion of such a theory must have a gravity sector con
taining infinite towers of asymptotically parallel\, equispaced\, and line
ar Regge trajectories. This implies that the gravity sector has a stringy
structure with an upper bound on the string scale. Another consequence of
this bound is that all metastable higher spin particles in 4d with masses
below the string scale must satisfy a weak gravity condition. Moreover\, t
hese bounds also have surprising implications for large N QCD coupled to g
ravity.\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tim Adamo (University of Edinburgh)
DTSTART:20201125T150000Z
DTEND:20201125T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/11
DESCRIPTION:Title: Scattering in chiral strong backgrounds\nby Tim Adamo (University
of Edinburgh) as part of Theoretical and Mathematical Physics\n\n\nAbstra
ct\nThere are many reasons to be interested in quantum field theory in the
presence of strong\, non-perturbative background fields\, but surprisingl
y little is known in these scenarios\, especially when compared to trivial
backgrounds. For instance\, the full semi-classical S-matrices of gauge t
heory and gravity are known in a trivial background\, but even for simple
strong backgrounds the tree-level amplitudes of these theories have not be
en computed beyond four-external particles. This raises the question: are
all-multiplicity formulae (and other hallmarks of the study of scattering
amplitudes in recent years) inextricably tied to trivial backgrounds? In t
his talk\, I will demonstrate that for a broad class of chiral backgrounds
in four-dimensions\, we can find all-multiplicity expressions for tree-le
vel scattering amplitudes of gauge theory and gravity which are remarkably
simple and clearly un-related to standard background-coupled field theory
on space-time.\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Konstantin Zarembo (Niels Bohr Institute\, Nordita)
DTSTART:20201202T150000Z
DTEND:20201202T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/12
DESCRIPTION:Title: Large-N localization and quiver CFT\nby Konstantin Zarembo (Niels
Bohr Institute\, Nordita) as part of Theoretical and Mathematical Physics
\n\n\nAbstract\nThe quiver CFT interpolates between N=4 SYM and N=2 super-
QCD\, and is dual to strings on the AdS5 x S5/Z2 orbifold. Localization of
the path integral in the quiver CFT potentially gives means to test this
duality rigorously. The strong-coupling solution of the localization matri
x model\, which I will describe\, is in the remarkable qualitative agreeme
nt with the holographic dual\, but is not devoid of puzzling features.\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fedor Popov (Princeton University)
DTSTART:20201209T150000Z
DTEND:20201209T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/13
DESCRIPTION:Title: RG Limit Cycles and "Spooky" Fixed Points in Perturbative QFT\nby
Fedor Popov (Princeton University) as part of Theoretical and Mathematica
l Physics\n\n\nAbstract\nWe study quantum field theories with sextic inter
actions in \n3−ϵ dimensions\, where the scalar fields ϕab form irreduc
ible representations under the O(N)2 or O(N) global symmetry group. We cal
culate the beta functions up to four-loop order and find the Renormalizati
on Group fixed points. In an example of large N equivalence\, the parent O
(N)2 theory and its anti-symmetric projection exhibit identical large N be
ta functions which possess real fixed points. However\, for projection to
the symmetric traceless representation of O(N)\, the large N equivalence i
s violated by the appearance of an additional double-trace operator not in
herited from the parent theory. Among the large N fixed points of this dau
ghter theory we find complex CFTs. The symmetric traceless O(N) model also
exhibits very interesting phenomena when it is analytically continued to
small non-integer values of N. Here we find unconventional fixed points\,
which we call "spooky." They are located at real values of the coupling co
nstants gi\, but two eigenvalues of the Jacobian matrix ∂βi/∂gj are c
omplex. When these complex conjugate eigenvalues cross the imaginary axis\
, a Hopf bifurcation occurs\, giving rise to RG limit cycles. This crossin
g occurs for Ncrit≈4.475\, and for a small range of N above this value w
e find RG flows which lead to limit cycles.\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ivo Sachs (Ludwig Maximilian University of Munich)
DTSTART:20201216T150000Z
DTEND:20201216T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/14
DESCRIPTION:Title: Loops in Holography\nby Ivo Sachs (Ludwig Maximilian University o
f Munich) as part of Theoretical and Mathematical Physics\n\n\nAbstract\nA
quantum field theory (QFT) in an (Anti-)de Sitter\, (A-)dS space-time can
be characterised by a conformal field theory (CFT) much like the S-matrix
for Minkowski QFT’s. I will review how quantum loops are reflected in C
FT\, both in AdS and dS. The latter has a remote connection to density per
turbations in the Universe.\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Domenico Orlando (INFN Turin\, University of Bern)
DTSTART:20210127T150000Z
DTEND:20210127T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/15
DESCRIPTION:Title: The O(N) vector model at large charge: EFT\, large N and resurgence\nby Domenico Orlando (INFN Turin\, University of Bern) as part of Theo
retical and Mathematical Physics\n\n\nAbstract\nI will discuss the IR fixe
d point of the O(N) vector model in 3 dimensions (Wilson-Fisher point) in
the framework of the large charge expansion. First I will construct an EFT
valid for any N\, then verify the prediction of the model in the double s
caling limit of large N\, large charge and finally discuss the use of resu
rgence to extend the validity of the EFT to sectors of small charge.\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Piotr Tourkine (Paris LPTHE\, CERN)
DTSTART:20210203T150000Z
DTEND:20210203T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/16
DESCRIPTION:Title: Scattering from production in 2d\nby Piotr Tourkine (Paris LPTHE\
, CERN) as part of Theoretical and Mathematical Physics\n\n\nAbstract\nIn
this seminar\, I will talk about recent results about a numerical method t
o find unitary S-matrices. The method\, based on works of Atkinson\, was i
nvented in the late 60s and was used as a proof of existence of functions
that satisfy all of the S-matrix axioms in 4d. However\, it was not put in
practical use.\nOur recent results concern the implementation of those me
thods for S-matrices in two dimensions\, using two different iterative sch
emes: a fixed-point iteration and Newton's method. Those schemes iterate t
he unitarity and dispersion relations\, and converge to solutions to the S
-matrix axioms. This numerical strategy provides a solution to the problem
of reconstructing the scattering amplitude starting from a given particle
production probability. \nAfter a general introduction\, the talk will be
focused on how we implemented the algorithms\, what they converge to\, an
d the conditions under which they converge. We will see that the question
of convergence naturally connects to the recent study of the coupling maxi
mization in the two-dimensional S-matrix bootstrap. If time allows\, I'll
also comment on a fractal structure which we observed to be related to the
so-called CDD-ambiguities.\nI'll conclude with possible future directions
.\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Xinan Zhou (Princeton University)
DTSTART:20210217T150000Z
DTEND:20210217T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/17
DESCRIPTION:Title: Holographic correlators and emergent Parisi-Sourlas supersymmetry
\nby Xinan Zhou (Princeton University) as part of Theoretical and Mathemat
ical Physics\n\n\nAbstract\nIn this talk\, I will first review the recent
progress in computing holographic four-point correlators in maximally supe
rsymmetric CFTs. I will introduce the so-called Maximally R-symmetry Viola
ting (MRV) limit\, in which the Mellin amplitudes drastically simplify and
become easy to compute. From the MRV limit\, I will show that the full am
plitudes can be reconstructed by using symmetries. This gives a complete a
nswer to all tree-level four-point functions in all three maximally supers
ymmetric backgrounds AdS4xS7\, AdS5xS5\, and AdS7xS4. In the second part o
f my talk\, I will point out that these results have surprising properties
. The Mellin amplitudes exhibit an emergent dimensional reduction structur
e\, which allows them to be expressed in terms of only scalar exchange amp
litudes from lower dimensional spacetimes. I will explain that this dimens
ional reduction structure is closely related to a holographic realization
of the Parisi-Sourlas supersymmetry.\n\nConference id: 923 6907 4572\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ricardo Monteiro (Queen Mary University of London)
DTSTART:20210224T150000Z
DTEND:20210224T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/18
DESCRIPTION:Title: Gravity as a double copy of gauge theory\nby Ricardo Monteiro (Qu
een Mary University of London) as part of Theoretical and Mathematical Phy
sics\n\n\nAbstract\nRelations expressing gravity as a "double copy" of gau
ge theory appeared first in string theory\, and have been used to compute
scattering amplitudes in theories of gravity\, with applications to both t
heory and phenomenology. I will discuss how the double copy extends to sol
utions to the equations of motion\, including our best known black hole sp
acetimes\, and how this story connects to the original story for scatterin
g amplitudes.\n\nMeeting ID: 928 8340 6261\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Linus Wulff (Masaryk University)
DTSTART:20210303T150000Z
DTEND:20210303T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/19
DESCRIPTION:Title: O(D\,D) and string alpha'-corrections\nby Linus Wulff (Masaryk Un
iversity) as part of Theoretical and Mathematical Physics\n\n\nAbstract\nS
tring theory on a d-dimensional torus features an O(d\,d) symmetry. It has
been suggested that the low-energy effective action can be formulated wit
h a larger O(D\,D) symmetry\, even before putting the theory on a torus. T
his approach\, which goes by the name of Double Field Theory (DFT)\, has p
roven very useful. I will address the problem of constructing higher deriv
ative invariants in this formalism. In agreement with the literature we fi
nd that a quadratic Riemann invariant can be constructed\, which can accou
nt for the first alpha'-correction to the bosonic and heterotic string. Ho
wever\, we find that no cubic or quartic Riemann invariants can be constru
cted. This suggests that the quartic Riemann terms arising at order alpha'
^3 in string theory do not have a DFT embedding.\n\nConference ID: 966 841
5 0220\nPasscode: 995622\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Radu Roiban (Penn State University)
DTSTART:20210310T150000Z
DTEND:20210310T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/20
DESCRIPTION:Title: Spinning and spinless two-particle dynamics from gravitational scatte
ring amplitudes\nby Radu Roiban (Penn State University) as part of The
oretical and Mathematical Physics\n\n\nAbstract\nIn the appropriate classi
cal limit\, scattering amplitude-based techniques can yield the classical
interaction of massive bodies at fixed order in the post-Minkowskian expan
sion.\n\nIn this talk we review a framework for the construction of the tw
o-body Hamiltonian for compact binary systems and illustrate it with state
of the art results for both spinning and spinless systems. Throughout we
emphasize structure of gravitational interactions and direct relations bet
ween scattering amplitudes and observables of two-particle dynamics.\n\nMe
eting ID: 933 8672 1535\nPasscode: 122819\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vladimir Rosenhaus (Institute for Advanced Study\, Princeton)
DTSTART:20210317T150000Z
DTEND:20210317T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/21
DESCRIPTION:Title: Chaotic scattering with a highly excited string\nby Vladimir Rose
nhaus (Institute for Advanced Study\, Princeton) as part of Theoretical an
d Mathematical Physics\n\n\nAbstract\nMotivated by the desire to understan
d chaos in the S-matrix of string theory\, we study tree level scattering
amplitudes involving highly excited strings. While the amplitudes for scat
tering of light strings have been a hallmark of string theory since its e
arly days\, scattering of excited strings has been far less studied. Recen
t results on black hole chaos\, combined with the correspondence principle
between black holes and strings\, suggest that the amplitudes have a ric
h structure. We review the procedure by which an excited string is formed
by repeatedly scattering photons off of an initial tachyon. We compute the
scattering amplitude of one arbitrary excited string decaying into two ta
chyons\, and study its properties for a generic excited string. We find th
e amplitude is highly erratic as a function of both the precise excited st
ring state and of the tachyon scattering angle.\n\nMeeting ID: 936 3872 06
64\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Paul Heslop (Durham University)
DTSTART:20210324T150000Z
DTEND:20210324T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/22
DESCRIPTION:Title: Towards the Virasoro-Shapiro Amplitude in AdS5xS5\nby Paul Heslop
(Durham University) as part of Theoretical and Mathematical Physics\n\n\n
Abstract\nWe propose a systematic procedure for obtaining all single trace
1/2-BPS correlators in N=4 super Yang-Mills corresponding to the four-poi
nt tree-level amplitude for type IIB string theory in AdS5xS5. The underly
ing idea is to compute generalised contact Witten diagrams coming from a 1
0d effective field theory on AdS5xS5 whose coefficients are fixed by the f
lat space Virasoro-Shapiro amplitude up to ambiguities related to commutat
ors of the 10d covariant derivatives which require additional information
such as localisation. We illustrate this procedure by computing stringy co
rrections to the supergravity prediction for all single trace 1/2-BPS corr
elators up to O(α′7)\, and spell out a general algorithm for extending
this to any order in α′.\n\nID: 949 0759 4642\nPasscode: 121781\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Congkao Wen (Queen Mary University of London)
DTSTART:20210331T150000Z
DTEND:20210331T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/23
DESCRIPTION:Title: Integrated four-point correlators in N=4 SYM\nby Congkao Wen (Que
en Mary University of London) as part of Theoretical and Mathematical Phys
ics\n\n\nAbstract\nIn this talk\, we will discuss integrated correlators o
f four superconformal primaries in N=4 super Yang-Mills\, that are defined
by integrating over spacetime coordinates of the four-point correlator wi
th certain integration measures. The integrated correlators can be compute
d using supersymmetric localisation\, which are expressed as N-dimensional
matrix-model integrals. We will mostly focus on one of the integrated cor
relators. We find that this integrated correlator can be presented as a la
ttice sum\, which makes manifest the SL(2\, Z) modular invariance of N=4 S
YM. Furthermore\, the integrated correlator obeys a remarkable Laplace-di
fference equation\, which relates the correlator of SU(N) theory with thos
e of SU(N-1) and SU(N+1) theories. The expression allows us to obtain exac
t results of the integrated correlator in various limits. For instance\, i
n perturbation\, the expression is checked to be consistent with known res
ults in the literature\; in the large-N limit\, it is shown to match with
the expected results from string theory due to AdS/CFT duality\n\nMeeting
ID: 946 1044 3637\nPasscode: 074360\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Oleg Lunin (SUNY-Albany)
DTSTART:20210407T150000Z
DTEND:20210407T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/24
DESCRIPTION:Title: Supergravity excitations of stringy geometries\nby Oleg Lunin (SU
NY-Albany) as part of Theoretical and Mathematical Physics\n\n\nAbstract\n
Motivated by the desire to understand the dynamics of light modes on vario
us gravitational backgrounds\, this talk summarizes recent results concern
ing properties of scalar\, vector\, and tensor excitations of black holes
and integrable stringy geometries.\n\nFor rotating black holes and for cer
tain Wess-Zumino-Witten models\, full separability of all dynamical equati
ons is demonstrated\, and symmetries underlying this property are uncovere
d. For other classes of integrable backgrounds\, the energy spectra of var
ious fields are evaluated\, and the algebraic constructions of the corresp
onding eigenfunctions are presented.\n\nMeeting ID: 973 8330 1111\nPasscod
e: 082472\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexander Vikman (Institute of Physics of the Czech Academy of Sci
ences\, Prague)
DTSTART:20210414T150000Z
DTEND:20210414T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/25
DESCRIPTION:Title: Losing the trace to discover dynamical Newton or Planck constants
\nby Alexander Vikman (Institute of Physics of the Czech Academy of Scienc
es\, Prague) as part of Theoretical and Mathematical Physics\n\n\nAbstract
\nI will discuss our recent work e-Print: 2011.07055. There we showed tha
t promoting the trace part of the Einstein equations to a trivial identit
y results in the Newton constant being an integration constant. Thus\, in
this formulation the Newton constant is a global dynamical degree of freed
om which is also a subject to quantization\, quantum fluctuations and the
Heisenberg uncertainty relations. This is similar to what happens to the
cosmological constant in the unimodular gravity where the trace part of th
e Einstein equations is lost in a different way. I will consider a constra
ined variational formulation of these modified Einstein equations. Then\,
drawing on analogies with the Henneaux-Teitelboim action for unimodular gr
avity\, I will discuss different general-covariant actions resulting in th
ese dynamics. In this approach\, it turned out that the inverse of the dyn
amical Newton constant is canonically conjugated to the Ricci scalar integ
rated over spacetime. Surprisingly\, instead of the dynamical Newton const
ant one can formulate an equivalent theory with a dynamical Planck constan
t. Finally\, I will show that an axion-like field can play a role not only
of the cosmological constant\, as in e-Print: 2001.03169\, but also of th
e Newton constant or even of the Planck constant.\n\nMeeting ID: 953 6604
7713\nPasscode: 353336\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/25/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alberto Salvio (University of Rome Tor Vergata)
DTSTART:20210421T150000Z
DTEND:20210421T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/26
DESCRIPTION:Title: Models for a vast energy range: particles meet gravity and cosmology<
/a>\nby Alberto Salvio (University of Rome Tor Vergata) as part of Theoret
ical and Mathematical Physics\n\n\nAbstract\nI will discuss models valid o
ver a vast energy range by following 2 strategies. In one approach (bottom
-up) I will illustrate the main phenomenological aspects of a scenario whe
re one adds to the Standard Model 3 right-handed neutrinos and an axion se
ctor. This can account for neutrino oscillations\, dark matter\, baryogeng
esis\, inflation and can also stabilize the electroweak vacuum. In another
\, more ambitious approach\, I will talk about a scenario where all coupli
ngs flow to zero at infinite energy (total asymptotic freedom). The corre
sponding phenomenology of this top-down approach will also be treated.\n\n
Meeting ID: 977 1065 2931\nPasscode: 042219\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/26/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Osten (ITMP MSU\, Moscow)
DTSTART:20210505T150000Z
DTEND:20210505T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/27
DESCRIPTION:Title: Exceptional world-volume currents and their algebras\nby David Os
ten (ITMP MSU\, Moscow) as part of Theoretical and Mathematical Physics\n\
n\nAbstract\nAfter a short review of exceptional generalised geometry I wi
ll introduce a unified setup for a duality-covariant Hamiltonian formulati
on of world-volume theories of objects in string and M-theory. Based on ht
tps://arxiv.org/abs/2103.03267\n\nMeeting ID: 981 6226 4274\nPasscode: 001
440\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/27/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jorge Guillermo Russo (ICREA and University of Barcelona)
DTSTART:20210512T150000Z
DTEND:20210512T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/28
DESCRIPTION:Title: Thermal correlators in CFT and black holes\nby Jorge Guillermo Ru
sso (ICREA and University of Barcelona) as part of Theoretical and Mathema
tical Physics\n\n\nAbstract\nWe describe the computation of thermal 2-poin
t correlation functions in the black brane AdS5 background dual to 4d CFT'
s at finite temperature for operators of large scaling dimension. This giv
es rise to a formula that matches the expected structure from the OPE. The
thermal 2-point function has an exponentiation property\, whose origin we
explain. We also compute the first correction to the two-point function d
ue to graviton emission\, which encodes the time travel to the black hole
singularity. We will also discuss some interesting features of higher-poin
t functions.\n\nMeeting ID: 919 8499 0422\nPasscode: 268796\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/28/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Edoardo Vescovi (KTH Royal Institute of Technology\, Stockholm Uni
versity)
DTSTART:20210519T150000Z
DTEND:20210519T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/29
DESCRIPTION:Title: Probing boundary states at finite coupling\nby Edoardo Vescovi (K
TH Royal Institute of Technology\, Stockholm University) as part of Theore
tical and Mathematical Physics\n\n\nAbstract\nIn this talk\, we calculate
exactly the correlation function of a Wilson loop operator and a local non
-BPS operator in planar N=4 SYM. First\, we introduce an effective theory
for such observable in free theory and we reformulate the gauge-theory com
putation as an overlap between an energy eigenstate of a spin-chain and a
matrix product state. The form of the result supports the interpretation o
f the correlator as an overlap between an integrable boundary state\, whic
h we determine using symmetry and integrability\, and the state correspond
ing to the single-trace operator. Second\, we explain how to formulate a n
on-perturbative bootstrap program based on the results obtained in this fr
amework.\n\nMeeting ID: 919 8499 0422\nPasscode: 268796\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/29/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fedor Bezrukov (University of Manchester)
DTSTART:20210526T150000Z
DTEND:20210526T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/30
DESCRIPTION:Title: Inflation and reheating with Higgs inflation and related models\n
by Fedor Bezrukov (University of Manchester) as part of Theoretical and Ma
thematical Physics\n\n\nAbstract\nUsing the Higgs field for inflation is a
n economic way to solve two problems with one scalar field -- Higgs field
is require in the Standard Model\, and a scalar field is the simplest meth
od to drive inflation of the early Universe. However\, consistent attempt
to do this takes us to the limits of validity of the quantum field theory
\, and significant problems with the reheating after inflation. I’ll dis
cuss the ways to deal with this by combining the theory with R^2 gravitati
onal terms\, and describe the highly nontrivial dynamics of the system aft
er inflation\n\nMeeting ID: 919 8499 0422\nPasscode: 268796\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/30/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Angelos Fotopoulos (Northeastern University\, Boston)
DTSTART:20210602T163000Z
DTEND:20210602T173000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/31
DESCRIPTION:Title: Celestial CFT Correlators and Conformal Block Decomposition\nby A
ngelos Fotopoulos (Northeastern University\, Boston) as part of Theoretica
l and Mathematical Physics\n\n\nAbstract\nI will shortly review the connec
tion of the Bondi-van der Burg-Metzner-Sachs (BMS) symmetry group of asymp
totically flat four-dimensional spacetimes at null infinity to the S-matri
x of elementary particles and gravitons. \nApplying Mellin transformations
to traditional\, momentum space amplitudes we can compute celestial ampli
tudes. These are conjectured to correspond to correlators of conformal pri
mary fields on a putative two-dimensional celestial sphere. I will elabora
te on the proposal of flat holography in which four-dimensional physics is
encoded in two-dimensional celestial conformal field theory (CCFT). The s
ymmetry underlying CCFT is the extended BMS symmetry of (asymptotically) f
lat spacetime. I will show how to use soft and collinear theorems of Einst
ein-Yang-Mills theory to derive the OPEs of BMS field operators generating
the symmetries of the BMS group\, superrotations and supertranslations. \
nIn the second part of my talk\, time permitted\, I will discuss a proposa
l for radial quantization of the CCFT and I will present an attempt to dec
ompose gluon celestial amplitudes in conformal blocks. This will reveal so
me very interesting aspects of the Celestial CFT: the emergence of new ope
rators in the theory and space-time scattering channels which lead to cont
inuous complex spin primary fields. The space-time interpretation of these
operators is still unclear. Moreover\, CFT crossing symmetry and its rela
tion to four-dimensional spacetime crossing symmetry of the S-matrix are s
ome interesting open problems.\n\nMeeting ID: 919 8499 0422\nPasscode: 268
796\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/31/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kristiansen Lara (University of Santiago\, Chile)
DTSTART:20210609T150000Z
DTEND:20210609T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/32
DESCRIPTION:Title: Integrable Systems and Spacetime Dynamics\nby Kristiansen Lara (U
niversity of Santiago\, Chile) as part of Theoretical and Mathematical Phy
sics\n\n\nAbstract\nIt is shown that the Ablowitz-Kaup-Newell-Segur (AKNS)
integrable hierarchy can be obtained as the dynamical equations of three-
dimensional General Relativity with a negative cosmological constant. This
geometrization of AKNS system is possible through the construction of nov
el boundary conditions for the gravitational field. These are invariant un
der an asymptotic symmetry group characterized by an infinite set of AKNS
commuting conserved charges. Gravitational configurations are studied by m
eans of $SL(2\,\\mathbb{R})$ conjugacy classes. Conical singularities and
black hole solutions are included in the boundary conditions. Based on ht
tps://arxiv.org/abs/2104.09676\n\nMeeting ID: 919 8499 0422\nPasscode: 268
796\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/32/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shota Komatsu (CERN and IAS Princeton)
DTSTART:20210616T150000Z
DTEND:20210616T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/33
DESCRIPTION:Title: Comments on Large Charge and N=4 SYM\nby Shota Komatsu (CERN and
IAS Princeton) as part of Theoretical and Mathematical Physics\n\n\nAbstra
ct\nI will discuss three topics on the large charge limit of N=4 super Yan
g-Mills and its holographic dual. First\, I will discuss what we can learn
from holography about general structures of the large-charge expansion of
SCFT with higher-rank gauge groups. Second\, I will briefly discuss the d
ouble-scaling limit and their relation to the central extension of the sym
metry. Third I will explain how the ideas from the large-charge expansion
help to resolve confusions in the literature on the holographic computatio
n of correlation functions of heavy operators dual to D-branes in AdS.\n\n
Meeting ID: 919 8499 0422\nPasscode: 268796\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/33/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alex Buchel (Perimeter Institute)
DTSTART:20210922T150000Z
DTEND:20210922T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/34
DESCRIPTION:Title: Black holes on a conifold with fluxes\nby Alex Buchel (Perimeter
Institute) as part of Theoretical and Mathematical Physics\n\n\nAbstract\n
We present a comprehensive analysis of the black holes on warped deformed
conifold with fluxes in Type IIB supergravity. These black holes realize t
he holographic dual to thermal states of the N = 1 supersymmetric SU(N) ×
SU(N + M) cascading gauge theory of Klebanov et al on round S^3 . There
are three distinct mass scales in the theory: the strong coupling scale Λ
of the cascading gauge theory\, the compactification scale µ = 1/L_3 (re
lated to the S^3 radius L_3 ) and the temperature T of a thermal state. De
pending on Λ \, µ and T \, there is an intricate pattern of confinement/
deconfinement (Hawking-Page) and the chiral symmetry breaking phase transi
tions.\n\nMeeting ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/34/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eugeny Babichev (The University Paris-Saclay)
DTSTART:20210929T150000Z
DTEND:20210929T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/35
DESCRIPTION:Title: Black holes in scalar-tensor theories\nby Eugeny Babichev (The Un
iversity Paris-Saclay) as part of Theoretical and Mathematical Physics\n\n
\nAbstract\nI will review black hole solutions in Horndeski theory and its
extensions. For shift symmetric theories of Horndeski and beyond Horndesk
i theory\, black holes involve several classes of nontrivial solutions: th
ose that include\, at the level of the action\, a linear coupling to the G
auss-Bonnet term and those that involve time dependence in the scalar fiel
d. I will describe black hole solutions of both classes in some detail. I
will also review and discuss recent results on hairy black holes in partic
ular subclasses of the theory.\n\nMeeting ID: 815 0976 8678\nPasscode: 879
098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/35/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Victor Gorbenko (Stanford University)
DTSTART:20211006T150000Z
DTEND:20211006T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/36
DESCRIPTION:Title: Non-perturbative gravitational effects in cosmology\nby Victor Go
rbenko (Stanford University) as part of Theoretical and Mathematical Physi
cs\n\n\nAbstract\nI will start with reviewing some recent progress in unde
rstanding the black hole evaporation with the help of gravitational path i
ntegral methods. It turns out that for certain observables\, for example t
he so-called Page curve for the BH entropy\, higher-topology saddle points
of the gravitational path integral produce important and calculable contr
ibutions. I will then discuss potential applications of similar ideas in c
osmology and when such non-perturbative effects may be relevant. Then\, I
will demonstrate a concrete calculation in a simple toy-model\, where a br
a-ket wormhole\, that is a connection between the bra and the ket of the w
ave function of the universe arises.\n\nMeeting ID: 815 0976 8678\nPasscod
e: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/36/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kurt Hinterbichler (Case Western Reserve University)
DTSTART:20211013T150000Z
DTEND:20211013T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/37
DESCRIPTION:Title: Unitarization in Kaluza Klein theory and the Geometric Bootstrap\
nby Kurt Hinterbichler (Case Western Reserve University) as part of Theore
tical and Mathematical Physics\n\n\nAbstract\nThe infinite towers of massi
ve particles present in Kaluza Klein reductions of Einstein gravity conspi
re to soften the high-energy behavior of the scattering of massive spin-2
states. The mechanism by which this occurs leads to a bootstrap procedure
\, analogous to the conformal bootstrap\, that yields new non-trivial cons
traints on the eigenvalue spectra of closed Einstein manifolds.\n\nMeeting
ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/37/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dmitri Bykov (Steklov Mathematical Institute)
DTSTART:20211020T150000Z
DTEND:20211020T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/38
DESCRIPTION:Title: Sigma models as Gross-Neveu models\nby Dmitri Bykov (Steklov Math
ematical Institute) as part of Theoretical and Mathematical Physics\n\n\nA
bstract\nI will show that there is a wide class of integrable sigma models
that are exactly and explicitly equivalent to bosonic Gross-Neveu models.
In full generality these are models with quiver variety phase spaces\, bu
t the familiar CP^n\, Grassmannian or flag manifold sigma models belong to
this class as well. This approach leads to a new take on topics such as R
G (Ricci) flow\, construction of integrable deformations and the inclusion
of fermions. In particular\, it provides a way of obtaining worldsheet SU
SY theories from target space SUSY theories by means of a supersymplectic
quotient.\n\nMeeting ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/38/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrei Parnachev (Trinity College Dublin)
DTSTART:20211027T150000Z
DTEND:20211027T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/39
DESCRIPTION:Title: Stress tensor and conformal correlators\nby Andrei Parnachev (Tri
nity College Dublin) as part of Theoretical and Mathematical Physics\n\n\n
Abstract\nI will describe a calculation of the contributions of stress ten
sor composites to correlators in CFTs (in d>2) with a large number of degr
ees of freedom\, including holographic CFTs. Implications for holography\
, thermalization and possible higher spin symmetries relevant for near lig
htcone correlators will be discussed.\n\nMeeting ID: 815 0976 8678\nPassco
de: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/39/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mikhail Ivanov (Princeton\, IAS)
DTSTART:20211103T150000Z
DTEND:20211103T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/40
DESCRIPTION:Title: Love and Naturalness\nby Mikhail Ivanov (Princeton\, IAS) as part
of Theoretical and Mathematical Physics\n\n\nAbstract\nTidal Love numbers
of a compact body capture multipole moments induced by external gravitati
onal fields. Also they appear as Wilson coefficients in the post-Newtonian
effective field theory of extended objects. It has been known for a decad
e that Love numbers vanish identically for black holes in four dimensions\
, which posed a major naturalness problem in the EFT context. In my talk\,
I will present a new hidden (“Love”) symmetry of black holes\, which
elegantly resolves this naturalness paradox.\n\nMeeting ID: 815 0976 8678\
nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/40/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tommaso Macrelli (Surrey University)
DTSTART:20211117T150000Z
DTEND:20211117T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/41
DESCRIPTION:Title: Colour-kinematic duality\, double copy and homotopy algebras\nby
Tommaso Macrelli (Surrey University) as part of Theoretical and Mathematic
al Physics\n\n\nAbstract\nWhile colour-kinematic duality and double copy a
re a well established paradigm at tree level\, their loop level generalisa
tion remained for a long time an unsolved problem. Lifting the on-shell\,
scattering amplitude-based description to an action-based approach\, we sh
ow that a theory that exhibits tree level colour-kinematic duality can be
reformulated in a way such that its loop integrands manifest colour-kinema
tic duality.\nAfter a review of Batalin-Vilkovisky formalism and homotopy
algebras\, we discuss how these structures emerge in quantum field theory
and gravity. We focus then on the application of these sophisticated mathe
matical tools to colour-kinematic duality and double copy\, introducing an
adequate notion of colour-kinematic factorisation.\nThis talk is based on
arXiv:2007.13803 [hep-th]\, arXiv:2102.11390 [hep-th]\, arXiv:2108.03030
[hep-th].\n\nMeeting ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/41/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hongliang Jiang (Queen Mary University)
DTSTART:20211124T150000Z
DTEND:20211124T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/42
DESCRIPTION:Title: Infinite symmetries and Ward identities in celestial holography\n
by Hongliang Jiang (Queen Mary University) as part of Theoretical and Math
ematical Physics\n\n\nAbstract\nCelestial holography reformulates the scat
tering amplitude holographically in terms of celestial conformal field the
ory living at boundary null infinity\, thus opening up an interesting and
promising avenue towards flat holography. In this talk\, I will discuss v
arious aspects of symmetry and their implications in celestial holography.
I will first discuss how to realize the global symmetry of spacetime in c
elestial CFT\, ranging from Poincare to conformal symmetry\, and further t
o the superconformal symmetry of N=4 SYM. Then I will study the asymptotic
symmetries from the celestial conformal field theory point of view. More
specifically\, by focusing on the soft sector of celestial OPEs\, I will d
erive an infinite-dimensional symmetry algebra\, dubbed holography chiral
algebra\, in supersymmetric Einstein-Yang-Mills theory. In the case of pur
e Einstein gravity\, the holography chiral algebra turns out to be the w_{
1+∞} algebra. These infinite symmetries give rise to infinite Ward iden
tities in celestial CFT\, which are equivalent to infinite soft theorems i
n scattering amplitudes. Finally\, I will also derive general formulae fo
r celestial OPEs and the corresponding Ward identities arising from arbitr
ary cubic interactions of three spinning massless particles.\n\nMeeting ID
: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/42/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nissan Itzhaki (Tel Aviv University)
DTSTART:20211208T150000Z
DTEND:20211208T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/43
DESCRIPTION:Title: A Puncture in the Euclidean Black Hole\nby Nissan Itzhaki (Tel Av
iv University) as part of Theoretical and Mathematical Physics\n\n\nAbstra
ct\nWe consider the backreaction of the winding zero mode on the cigar geo
metry. We focus on the case of the $SL(2\,R)_k/U(1)$ cigar associated with
e.g. the near-horizon limit of $k$ NS5 black-branes. We solve the equatio
ns of motion numerically in the large $k$ limit as a function of the ampli
tude of the winding mode at infinity. We find that there is a critical amp
litude $C_c=\\exp(-\\gamma/2)$ that admits a critical solution. The exact
CFT description of the $SL(2\,R)_k/U(1)$ cigar\, in particular the FZZ dua
lity\, fixes completely the winding amplitude. We find that in the large $
k$ limit there is an exact agreement $C_c=C_{FZZ}$.\nThe critical solution
is a cigar with a puncture at its tip\; consequently\, the BH entropy is
carried entirely by the winding condensate. We argue that\, in the Lorentz
ian case\, the information is ejected from the black hole through this pun
cture.\n\nMeeting ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/43/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Monica Guica (Institute of Theoretical Physics\, Saclay)
DTSTART:20220126T150000Z
DTEND:20220126T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/44
DESCRIPTION:Title: $J\\bar T$ - deformed CFTs as non-local CFTs\nby Monica Guica (In
stitute of Theoretical Physics\, Saclay) as part of Theoretical and Mathem
atical Physics\n\n\nAbstract\nI will start with a review of TTbar and JTba
r - deformed CFTs and their holographic interpretation. I will then show t
hat both TTbar and JTbar - deformed CFTs possess Virasoro x Virasoro symme
try. For the case of JTbar\, I will discuss the classical realization of t
hese symmetries in terms of field-dependent coordinate transformations and
show how the associated generators can be used to define an analogue of "
primary" operators in this non-local theory\, whose correlation functions
are entirely fixed in terms of those of the undeformed CFT.\n\nMeeting ID:
815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/44/
END:VEVENT
BEGIN:VEVENT
SUMMARY:John F. Donoghue (University of Massachusetts)
DTSTART:20220216T150000Z
DTEND:20220216T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/45
DESCRIPTION:by John F. Donoghue (University of Massachusetts) as part of T
heoretical and Mathematical Physics\n\n\nAbstract\nTBA\n\nMeeting ID: 815
0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/45/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Barvinsky Andrei (Lebedev Institute)
DTSTART:20220302T150000Z
DTEND:20220302T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/46
DESCRIPTION:Title: Horava gravity as palladium of locality\, unitarity and renormalizabi
lity: methods and results\nby Barvinsky Andrei (Lebedev Institute) as
part of Theoretical and Mathematical Physics\n\n\nAbstract\nWe discuss pro
blems of covariant renormalization of Lorentz non-invariant Horava gravity
models. Projectable version of these models in generic spacetime dimensio
ns is shown to maintain UV renormalizability\, locality and unitarity\, wh
ich is based on the BRST structure of renormalization in a special class o
f regular background covariant gauges. Renormalization group flow with the
asymptotically free UV fixed point is presented in (2+1)-dimensional theo
ry. Beta functions of (3+1)-dimensional theory are obtained by the combina
tion of dimensional reduction and the method of universal functional trace
s. They feature fixed points with several candidates for asymptotic freedo
m and also suggest an intriguing connection between the (3+1)-dimensional
Horava gravity with detailed balance and gravitational Chern-Simons/topolo
gical massive gravity.\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/46/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fernando Quevedo (Cambridge University)
DTSTART:20220323T150000Z
DTEND:20220323T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/47
DESCRIPTION:Title: On moduli stabilisation\, de Sitter spacetime and inflation from stri
ng compactifications\nby Fernando Quevedo (Cambridge University) as pa
rt of Theoretical and Mathematical Physics\n\n\nAbstract\nAn overview of t
he different attempts to stabilise the moduli fields\, measuring the size
and shape of the extra dimensions in string theory\, will be given. The ex
tension of these techniques towards obtaining de Sitter spacetime and a pe
riod of early universe inflation will be highlighted\, emphasizing recent
progress and open challenges.\n\nMeeting ID: 815 0976 8678\nPasscode: 8790
98\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/47/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ellis Ye Yuan (Zhejiang University)
DTSTART:20220330T150000Z
DTEND:20220330T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/48
DESCRIPTION:Title: Graviton Scattering in AdS at Two Loops\nby Ellis Ye Yuan (Zhejia
ng University) as part of Theoretical and Mathematical Physics\n\n\nAbstra
ct\nI will present a preliminary result on the third-order correction in 1
/N expansion to the four-point correlator of the stress tensor multiplet i
n N=4 super Yang-Mills theory at large 't Hooft coupling\, which correspon
ds to the two-loop scattering of four gravitons in the dual AdS5×S5 super
gravity. This is obtained by bootstrapping an educated ansatz based on int
uitions from a hidden 10-dimensionthe conformal symmetry\, which I will de
scribe in detail.\n\nMeeting ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/48/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mikhail Shaposhnikov (EPFL Lausanne)
DTSTART:20220406T150000Z
DTEND:20220406T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/49
DESCRIPTION:Title: Anomaly-free scale symmetry and gravity\nby Mikhail Shaposhnikov
(EPFL Lausanne) as part of Theoretical and Mathematical Physics\n\n\nAbstr
act\nWhat is the global symmetry of Nature? In the absence of gravity\, th
e most obvious answer to this question is given by special relativity and
is associated with the Poincare transformations. As was noted a long time
ago\, the free Maxwell equations have a wider symmetry group - the 15 para
meters conformal invariance\, containing in addition to ten Poincare gener
ators\, four special conformal transformations\, and dilatations. Dilatati
ons change the length of the rulers\, while special conformal transformati
on can bend the lines but do not alter the angles between them. Could it b
e that the symmetry of all interactions is conformal? We show that conform
al symmetry can be made free from the quantum anomaly only in the flat spa
ce. The presence of gravity would reduce the global symmetry group of the
fundamental theory to the scale invariance only. We discuss how the effect
ive Lagrangian respecting the scale symmetry can be used for the descripti
on of particle phenomenology and cosmology.\n\nMeeting ID: 815 0976 8678\n
Passcode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/49/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Barak Gabai (Harvard University)
DTSTART:20220413T150000Z
DTEND:20220413T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/50
DESCRIPTION:Title: Exact quantization\nby Barak Gabai (Harvard University) as part o
f Theoretical and Mathematical Physics\n\n\nAbstract\n1d Hamiltonian probl
ems are classically-integrable by definition. A manifestation of that is t
he fact that we can always use action-angle coordinates to parametrize the
phase space. A generalization of the action variables to QM is not immedi
ately obvious. In the presentation I will explain how to define rigorous q
uantities that can be thought of as the quantum action variables and how t
o write down an integral equation that determines their values\, for a lar
ge class of 1d Schrodinger problems. Then\, I will argue that these object
s encode all of the dynamical information about the Quantum system\, and e
xplain how to extract the spectrum. The results are exact and rigorous.\n\
nMeeting ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/50/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yuri Makeenko (ITEP\, Moscow)
DTSTART:20220427T150000Z
DTEND:20220427T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/51
DESCRIPTION:Title: How Pauli-Villars’ regularization tells the Nambu-Goto and Polyakov
strings apart\nby Yuri Makeenko (ITEP\, Moscow) as part of Theoretica
l and Mathematical Physics\n\n\nAbstract\nTBA\n\nMeeting ID: 815 0976 8678
\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/51/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sergey Solodukhin (University of Tours)
DTSTART:20220511T150000Z
DTEND:20220511T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/52
DESCRIPTION:Title: Quantum states and their back-reacted geometries\nby Sergey Solod
ukhin (University of Tours) as part of Theoretical and Mathematical Physic
s\n\n\nAbstract\nA black hole quantum state (Hartle-Hawking or Boulware)
is usually defined in a fixed background of a classical black hole. In my
talk I will discuss the corresponding space-time geometry when the back-re
action is taken into account. The important questions include: does the ba
ck-reacted geometry always contain a horizon?\; how it depends on the choi
ce of the quantum state?\; and what is the right choice for the quantum s
tate for the non-physical fields such as ghosts? I will answer these and o
ther questions in the context of a two-dimensional dilaton gravity. The ta
lk is based on a joint recent work with D. Sarkar and Y. Potaux\, arXiv:21
12.03855.\n\nMeeting ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/52/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dmitry Chicherin (Annecy LAPTH)
DTSTART:20220518T150000Z
DTEND:20220518T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/53
DESCRIPTION:Title: Null Wilson loop with Lagrangian insertion in N=4 super Yang-Mills th
eory\nby Dmitry Chicherin (Annecy LAPTH) as part of Theoretical and Ma
thematical Physics\n\n\nAbstract\nNull Wilson loops in N = 4 super Yang-Mi
lls are dual to planar scattering amplitudes. The duality holds at the lev
el of their finite four-dimensional loop integrands as well as for the int
egrated observables with properly regularized infrared and cusp divergence
s. We consider a closely related infrared-finite four-dimensional observab
le which interpolates between the integrand and the fully loop-integrated
quantity. It is defined as the null polygonal Wilson loop with a Lagrangia
n insertion normalized by the Wilson loop without insertion. Unlike the ra
tio and remainder functions of N = 4 super Yang-Mills amplitudes\, this ob
servable is non-trivial already at four points and it is reminiscent of fi
nite parts of QCD amplitudes. We discuss the general structure of this n-p
oint observable at weak coupling. At n>4\, the loop corrections have rich
kinematics. Indeed\, there are several leading singularities and the accom
panying loop functions are multivariable transcendental functions. We disc
uss a Grassmannian representation for the leading singularities and reveal
their conformal and dual conformal symmetries. We conjecture a duality re
lation between the observable and the highest transcendentality piece of t
he planar all-plus amplitude in pure Yang-Mills theory. We test the dualit
y using the one-loop n-point and two-loop four-point perturbative data for
the observable. Relying on the duality\, we predict the highest weight pi
ece of the three-loop five-particle all-plus amplitude.\n\nMeeting ID: 815
0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/53/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Luca Cassia (Uppsala University)
DTSTART:20220525T150000Z
DTEND:20220525T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/54
DESCRIPTION:Title: q-Virasoro constraints and the algebra of Wilson loops in 3d\nby
Luca Cassia (Uppsala University) as part of Theoretical and Mathematical P
hysics\n\n\nAbstract\nThe BPS/CFT correspondence predicts that the partiti
on function and other BPS observables in a 3d N=2 gauge theory can be mapp
ed to states in a q-deformed CFT\, i.e. a theory whose symmetry algebra is
q-Virasoro. Following this idea\, I will discuss how to derive q-Virasoro
constraints for the generating function of 1/2-BPS Wilson loops for a fam
ily of 3d N=2 gauge theories.\nUnder certain assumptions on the Chern--Sim
ons level and the number of flavors the constraints can be solved exactly
and the solution can be recast as a "superintegrability" formula for chara
cters of the gauge group. Moreover\, I will show that the same logic can b
e applied to refined Chern--Simons theories and refined ABJ theories to de
rive formulas for refined knot invariants of the unknot. If time permits I
will also discuss the symmetries of the constraints and their physical in
terpretation as dualities of the gauge theory. The talk is based on https:
//arxiv.org/abs/2007.10354 and https://arxiv.org/abs/2107.07525.\n\nMeetin
g ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/54/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dmitry Ponomarev (ITMP MSU\, Moscow)
DTSTART:20220601T150000Z
DTEND:20220601T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/55
DESCRIPTION:Title: Invariant traces of the flat space chiral higher-spin algebra as scat
tering amplitudes\nby Dmitry Ponomarev (ITMP MSU\, Moscow) as part of
Theoretical and Mathematical Physics\n\n\nAbstract\nWe sum up two- and thr
ee-point amplitudes in the chiral higher-spin theory over helicities and f
ind that these quite manifestly have the form of invariant traces of the f
lat space chiral higher-spin algebra. We consider invariant traces of prod
ucts of higher numbers of on-shell higher-spin fields and interpret these
as higher-point scattering amplitudes. This construction closely mimics it
s anti-de Sitter space counterpart\, which was considered some time ago an
d was confirmed holographically.\n\nMeeting ID: 815 0976 8678\nPasscode: 8
79098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/55/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Euihun Joung (Kyung Hee University\, Seoul)
DTSTART:20220608T150000Z
DTEND:20220608T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/56
DESCRIPTION:Title: Colorful particles and fields in low dimensions\nby Euihun Joung
(Kyung Hee University\, Seoul) as part of Theoretical and Mathematical Phy
sics\n\n\nAbstract\nI will present a few recent applications of colorful e
xtensions of spacetime symmetries to the theories of particles and fields
in two and three dimensions. In particular\, the two dimensional BF theori
es is shown to reduce a colorful extension of Schwarzian theory.\n\nMeetin
g ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/56/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vasily Maslov (ITMP MSU\, Moscow)
DTSTART:20221005T150000Z
DTEND:20221005T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/57
DESCRIPTION:Title: An Effective Field Theory for Large Oscillons\nby Vasily Maslov (
ITMP MSU\, Moscow) as part of Theoretical and Mathematical Physics\n\n\nAb
stract\nBased on arXiv:2208.04334. We consider oscillons - localized\, qua
siperiodic\, and extremely long-living classical solutions in models with
real scalar fields. We develop their effective description in the limit of
large size at finite field strength. Namely\, we note that nonlinear long
-range field configurations can be described by an effective complex field
$\\psi(t\, \\mathbf{x})$ which is related to the original fields by a can
onical transformation. The action for $\\psi$ has the form of a systematic
gradient expansion. At every order of the expansion\, such an effective t
heory has a global U(1) symmetry and hence a family of stationary nontopol
ogical solitons - oscillons. The decay of the latter objects is a nonpertu
rbative process from the viewpoint of the effective theory. Our approach g
ives an intuitive understanding of oscillons in full nonlinearity and expl
ains their longevity. Importantly\, it also provides reliable selection cr
iteria for models with long-lived oscillons. This technique is more precis
e in the nonrelativistic limit\, in the notable cases of nonlinear\, extre
mely long-lived\, and large objects\, and also in lower spatial dimensions
. We test the effective theory by performing explicit numerical simulation
s of a (d+1)-dimensional scalar field with a plateau potential.\n\nMeeting
ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/57/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sabir Ramamzanov (CEICO\, Prague)
DTSTART:20221019T150000Z
DTEND:20221019T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/58
DESCRIPTION:Title: Phase transitions in the dark Universe\nby Sabir Ramamzanov (CEIC
O\, Prague) as part of Theoretical and Mathematical Physics\n\n\nAbstract\
nTypically phase transitions are associated with a constant scale of symme
try breaking. In cosmology\, however\, a different situation is also natur
al: the expectation value of a scalar field responsible for symmetry break
ing can be induced by its interactions with hot primordial plasma\, in whi
ch case the expectation value decreases as the Universe cools down. This p
icture can be realized in a simple renormalizable and approximately scale-
invariant scenario. Non-trivial time-dependence of the symmetry breaking s
cale enables new mechanisms of particle production at phase transitions. T
hese particles can be considered for the role of dark matter. Another phen
omenologically interesting outcome of phase transitions is formation of to
pological defects\, which serve as a source of potentially observable grav
itational waves. The latter can be used to probe the underlying model in a
very weakly coupled regime inaccessible by other experiments.\n\nMeeting
ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/58/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leonid Bork (ITEP\, Moscow)
DTSTART:20221026T150000Z
DTEND:20221026T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/59
DESCRIPTION:Title: Exact off-shell Sudakov form factor in N=4 SYM\nby Leonid Bork (I
TEP\, Moscow) as part of Theoretical and Mathematical Physics\n\n\nAbstrac
t\nWe consider the Sudakov form factor in N=4 SYM in the off-shell kinemat
ical regime\, which can be achieved by considering the theory on its Coulo
mb branch. We demonstrate that up two three loops both the infrared-diverg
ent as well as the finite terms do exponentiate\, with the coefficient acc
ompanying log’s of mass determined by the octagon anomalous dimension Γ
_oct. This behaviour is in strike contrast to previous conjectural account
s in the literature. Together with the finite terms we observe that up to
three loops the logarithm of the Sudakov form factor is identical to twice
the logarithm of the null octagon 𝕆_0\, which was recently introduced
within the context of integrability-based approaches to four point correla
tion functions with infinitely-large R-charges. The null octagon 𝕆_0 is
known in a closed form for all values of the 't Hooft coupling constant a
nd kinematical parameters. We conjecture that the relation between 𝕆_0
and the off-shell Sudakov form factor will hold to all loop orders.\n\nMee
ting ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/59/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexander Ochirov (London Institute for Mathematical Sciences)
DTSTART:20221102T150000Z
DTEND:20221102T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/60
DESCRIPTION:Title: Chiral Approach to Massive Higher Spins\nby Alexander Ochirov (Lo
ndon Institute for Mathematical Sciences) as part of Theoretical and Mathe
matical Physics\n\n\nAbstract\nQuantum field theory of higher-spin particl
es is a formidable subject\, where preserving the physical number of degre
es of freedom in the Lorentz-invariant way requires a host of auxiliary fi
elds. They can be chosen to have a rich gauge-symmetry structure\, but int
roducing consistent interactions in such approaches is still a non-trivial
task\, with massive higher-spin Lagrangians specified only up to three po
ints. In this talk\, I will discuss a new\, chiral description for massive
higher-spin particles\, which in four spacetime dimensions allows to do a
way with the unphysical degrees of freedom. This greatly facilitates the i
ntroduction of consistent interactions. I will concentrate on three theori
es\, in which higher-spin matter is coupled to electrodynamics\, non-Abeli
an gauge theory or gravity. These theories are currently the only examples
of consistently interacting field theories with massive higher-spin field
s.\n\nMeeting ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/60/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Francois Rondeau (the Sorbonne)
DTSTART:20221109T150000Z
DTEND:20221109T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/61
DESCRIPTION:Title: Intersecting D-brane models and the anomalous magnetic moment of the
muon\nby Francois Rondeau (the Sorbonne) as part of Theoretical and Ma
thematical Physics\n\n\nAbstract\nThe anomalous magnetic moment of the muo
n ($(g-2)_{\\mu}$) might be one of the most promising signals of new physi
cs beyond the Standard Model (SM). The theoretical calculation predicts a
value smaller than the experimental measurement from the Brookhaven Nation
al Laboratory and Fermilab experiments\, with a standard deviation of $4.7
\\sigma$. This talk will discuss recently proposed solutions to this discr
epancy in the framework of low mass scale strings\, large extra dimensions
and intersecting D-brane physics.\n\nAfter reminding some basic aspects o
f intersecting D-brane models\, and in particular how the SM of particle p
hysics can be obtained in this framework\, we will present two proposals a
ble to explain (part of) the observed discrepancy. They are based on the c
ontributions to the $(g-2)_{\\mu}$ coming from the Kaluza-Klein (KK) state
s of the lepton number gauge boson\, corresponding to an open string tied
to a leptonic $U(1)$ brane\, as well as from light scalars corresponding t
o the first stringy excitations of an open string stretched between two D-
branes intersecting with an ultra-small angle. In both cases\, we show tha
t there is a region of the parameter space compatible with the current exp
erimental bounds\, where these states can provide significant contribution
s to the $(g-2)_{\\mu}$\, and fully or partially bridge the gap in the obs
erved discrepancy. We then build the minimal D-brane configurations able t
o realise these two proposals.\n\nThe talk is based on 2110.01247\, 2112.0
7587 and 2209.11152.\n\nMeeting ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/61/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexey Litvinov (Landau ITP\, Chernogolovka)
DTSTART:20221116T150000Z
DTEND:20221116T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/62
DESCRIPTION:Title: R-matrix formulation of affine Yangian of $\\hat{gl}(1|1)$ and integr
able systems of N=2 superconformal field theory\nby Alexey Litvinov (L
andau ITP\, Chernogolovka) as part of Theoretical and Mathematical Physics
\n\n\nAbstract\nWe study N=2 superconformal field theory and define the R-
matrix which acts as an intertwining operator between different realisatio
ns of N=2W -algebras of type A. Using the R-matrix we define RLL algebra a
nd relate it to current realisation of affine Yangian of $\\hat{gl}(1|1)$.
We also derive Bethe ansatz equations for the spectrum of integrals of mo
tion.\n\nMeeting ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/62/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yuya Kusuki (Caltech and Wako\, RIKEN)
DTSTART:20221123T150000Z
DTEND:20221123T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/63
DESCRIPTION:Title: AdS/BCFT from Bootstrap: Construction of Gravity with particle & bran
e\nby Yuya Kusuki (Caltech and Wako\, RIKEN) as part of Theoretical an
d Mathematical Physics\n\n\nAbstract\nWe consider gravity with branes and
massive particles\, which has many unclear aspects. For example\, we do no
t know how to understand some problematic configurations\, like brane self
-intersections\, negative tension branes\, and spinning particles interact
ing with branes. We address these issues through AdS/BCFT. We solve a rela
ted conformal bootstrap and show that the self-intersection can be avoided
by the black hole formation. We also reveal how to resolve the other prob
lems in AdS/BCFT using the bootstrap.\nIn the later part\, we give the res
olution of the same problems from the gravity side. For this purpose\, we
develop a simple way to construct gravity with branes and particles by cut
ting and pasting. The solution from this construction tells us how to reso
lve the issues from the gravity side\, which is completely consistent with
the CFT result.\nAs a bonus\, we find a refined formula for the holograph
ic Rényi entropy\, which appears to be crucial to correctly reproduce th
e boundary entropy term. We also find a holographic dual of boundary prima
ries.\n\nMeeting ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/63/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Carlo Heissenberg (Uppsala University and NORDITA)
DTSTART:20221130T150000Z
DTEND:20221130T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/64
DESCRIPTION:Title: Angular Momentum Loss Due to Tidal Effects in the Post-Minkowskian Ex
pansion\nby Carlo Heissenberg (Uppsala University and NORDITA) as part
of Theoretical and Mathematical Physics\n\n\nAbstract\nThe steadily incre
asing sensitivity of gravitational-wave measurements challenges the state
of the art of precision calculations for gravitational collisions. In this
context\, scattering amplitudes have contributed to the advance of the pr
ecision frontier in the Post-Minkowskian (PM) expansion\, based on success
ive approximations labeled by powers of Newton's constant G and valid for
generic velocities. In this talk\, based on arXiv:2210.15689\, I will illu
strate the calculation of tidal corrections to the loss of angular momentu
m in a two-body collision at leading Post-Minkowskian order from an amplit
ude-based approach. The eikonal operator allows us to efficiently combine
elastic and inelastic amplitudes\, and captures both the contributions due
to genuine gravitational-wave emissions and those due to the static gravi
tational field. We calculate the former by harnessing powerful collider-ph
ysics techniques such as reverse unitarity\, thereby reducing them to cut
two-loop integrals. For the latter\, we can employ the results of arXiv:22
03.11915 where static-field effects were calculated for generic gravitatio
nal scattering events using the leading soft graviton theorem.\n\nMeeting
ID: 815 0976 8678\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/64/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anton Pribytok (Trinity College\, Dublin)
DTSTART:20221207T150000Z
DTEND:20221207T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/65
DESCRIPTION:Title: Automorphic symmetry and AdS String novel integrable deformations
\nby Anton Pribytok (Trinity College\, Dublin) as part of Theoretical and
Mathematical Physics\n\n\nAbstract\nWe address the new structures arising
in quantum and string integrable theories\, as well as construct a method
to find them. Initially we implement the automorphic symmetries on periodi
c lattice systems and exploit properties of an integrable hierarchy. This
prescription is first applied for potentially new sl_2 sector\, Generalise
d Hubbard type classes and more. We then construct a boost recursion for s
ystems with R-/S-matrices that exhibit arbitrary spectral dependence\, whi
ch is also an apparent property of the scattering in AdS integrable backgr
ounds. The generalised bottom-up approach based on coupled differential sy
stems is derived to resolve for R-matrices exactly. In addition\, one can
isolate a special class of models (non-difference form) that provide a new
structure consistently arising in AdS_{3} and AdS_{2} string backgrounds.
These classes can be proven to be represented as deformations of the AdS_
{2\,3} models\, which satisfy free fermion\, constraint\, braiding unitari
ty\, crossing and exhibit deformed algebraic structure that shares certain
properties with AdS_3xSˆ3xMˆ4 and AdS_2xSˆ2xTˆ6 models. A related dis
cussion on further investigation of AdS_3 free fermion property\, TBA fini
te size corrections and GSE will be provided.\n\nMeeting ID: 815 0976 8678
\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/65/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dionysios Anninos (King’s College London)
DTSTART:20221214T150000Z
DTEND:20221214T170000Z
DTSTAMP:20260422T225847Z
UID:ITMPseminar/66
DESCRIPTION:Title: Finite Features in Holography\nby Dionysios Anninos (King’s Col
lege London) as part of Theoretical and Mathematical Physics\n\n\nAbstract
\nWe consider theories of gravity where a more "finite" holographic theory
is relevant. From a Lorentzian perspective we comment on properties of gr
avity in the presence of finite timelike boundaries\, and holographic real
isations. Time permitting\, we also discuss Euclidean gravity on manifolds
with no boundary\, like Euclidean de Sitter.\n\nMeeting ID: 815 0976 8678
\nPasscode: 879098\n
LOCATION:https://researchseminars.org/talk/ITMPseminar/66/
END:VEVENT
END:VCALENDAR