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fpuk@QMUL 6 December 2024 |
Organising Committee: J. Gauntlett, P. Kumar, N. Lambert, C. Papageorgakis,
S. Ross, S. Schafer-Nameki, J. Simone, B. Stefanski,
D. Tong and D. Turton
Schedule:
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Friday December 6th 2024 |
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10:30 |
Welcome Coffee |
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11:00 |
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11:20 |
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11:40 |
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12:00 |
Lunch |
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13:00 |
Gong Show |
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13:30 |
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14:30 |
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14:50 |
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15:10 |
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15:30 |
Break |
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16:00 |
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16:20 |
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16:40 |
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17:00 |
Bar Reception |
Registration
has closed but if you want to attend please email
us.
Directions:
The
talks will take place in the Octagon.
Please note that to gain entry to QMUL you will need to register (unless you
are from QMUL but then please register too).
Talks:
Emma
Albertini (Imperial): Towards a uniqueness
theorem for static black holes in Kaluza-Klein theory with small circle size
Kaluza-Klein theory has a variety of
different static black hole solutions and for fixed circle size, multiple
solutions with the same mass co-exist.
In my talk, I will conjecture that for fixed
mass and sufficiently small circle size, the only black holes are the
homogeneous ones (black strings) and I will give evidence that this is indeed
the case.
Firstly, I will consider a scalar field toy
model that gives an analogous set of static homogeneous and inhomogeneous
solutions as the gravitational case. In this set up, I will prove homogeneity
of the solutions for small circle size. A new approach to uniqueness
theorems will be introduced, using Sobolev spaces and elliptic analysis.
Thomas
Bartsch (Durham): Unitary
Categorical Symmetries
According to Wigner's theorem, global
symmetry groups act unitarily (or anti-unitarily) on local operators or states
of a quantum system. It is natural to ask how this generalises to
1.
the action of non-invertible symmetries on
local operators,
2.
the action of global symmetry groups on
extended operators.
In this talk, I will discuss both of the
above directions using the notions of tube algebras and higher unitary
representations.
Pieter Bomans (Oxford): Spherical branes and the
BMN matrix quantum mechanics
I will explain how maximally supersymmetric
Yang-Mills theories can be used to learn about the BMN matrix quantum
mechanics. Analytically continuing both the field theory and the gravity
solution in dimension down to d=1, I will show how this system gets related to
the BMN model and how this approach can be used to compute the free energy and
Wilson loop expectation values.
Simon Heuveline (Cambridge): Deformations of Celestial Chiral
Algebras and Self-Dual Black Holes
This talk is based on arXiv:2305.09451,
arXiv:2403.18011 and arXiv:2408.24324. We will discuss several deformations of
gravitational celestial chiral algebras which are closely related to $w_{1+\infty}$ and give bulk interpretations of the respective
deformations. Some of these deformations arise naturally from a backreaction in
self-dual Einstein gravity analogous to part of the recent top-down
construction of Costello, Paquette and Sharma and I will highlight similarities
and differences. These backreactions lead to self-dual limits of Plebanski-Demianski black hole metrics.
Osama Khlaif (Birmingham): Some new
results on 3d N=2 Chern-Simons-Matter theories
After giving a lightning review of the 3d N=2
A-model, in the first part of the talk we revisit some aspects of 1-form
symmetries in 3d N=2 gauge theories including their charge operators, their ‘t
Hooft anomalies, and their gauging. As an example, we show how to compute the
3d twisted index for SU(N)/Z_r gauge theory. In the
second part, we review 3d N=2 gauge theory/quantum K-theory correspondence and
extend its dictionary in the Grassmannian case.
Maria Nocchi (Oxford): An emergent worldsheet for strings on AdS
The study of string scattering in curved
spacetimes presents a stark contrast to the well-understood framework in flat
space, where perturbative techniques and worldsheet
methods can be used. However, the AdS/CFT
correspondence offers a powerful indirect method to compute string amplitudes
in AdS. In this talk, I will present recent
developments in the AdS Virasoro-Shapiro
program, which leverages standard CFT techniques and single-valuedness,
echoing its importance in flat space.
Arvind
Shekar (Southampton): Replica analysis of entanglement properties and
conditions for islands
I will present a systematic analysis of the properties
of entanglement entropy in curved backgrounds using the replica approach. We
will explore the analytic (q−1) expansion of Rényi
entropy S_q and its variations. Our setup applies to
generic variations, from symmetry transformations to variations of the
background metric or entangling region, and elegantly reproduces and
generalises results from the literature on entanglement entropy in different
dimensions, backgrounds, and states. We will use this analytic expansion to
explore the behaviour of entanglement entropy in static black hole
backgrounds under specific scaling transformations. Using this result, we
explicitly derive certain conditions on the QFT spectrum for the presence of
islands of entanglement, whose contribution to the black hole entropy has been
shown to provide enough quantum corrections to restore unitarity throughout the
evaporation process.
Nika
Sokolova (KCL):
Probing Excited Strings on AdS5 times S5 via Integrability and Crossing
Symmetry
We study the CFT data of planar 4D N=4
Super-Yang-Mills in the strong 't Hooft coupling limit, focusing on massive
short strings in the flat-space limit of AdS5 ×S5. Specifically, we analyse the
string states exchanged in the OPE of a four-point function dual to the AdS Virasoro-Shapiro amplitude.
By organising this data into Regge trajectories, we
predict the leading-order behaviour of four subleading
trajectories using integrability, analyticity, and recent advances in Virasoro-Shapiro amplitude calculations. Notably, one
trajectory and entire Kaluza-Klein towers decouple in the flat-space limit,
hinting at an emergent selection rule for short-string scattering. This talk is
based on arXiv:2409.07529, arXiv:2310.06041, and arXiv:2306.12379.
Peter
Weck (Swansea): Integrability
in axisymmetric gravity as a Chern-Simons theory
With enough spacetime symmetry, many classical theories of gravity become
integrable, allowing powerful solution generating methods to be employed. In
this talk, I will show how this fits into an emerging classification of
integrable field theories in terms of holomorphic and semi-holomorphic Chern-Simons actions. Focusing on 4d General Relativity, I
will review the associated 2d integrable sigma-model, before showing how it can
be obtained from a 4d Chern-Simons theory with
defects. Connections to Twistor space approaches to integrability will be
briefly discussed.
Daniel
Baldwin (KCL): On Classifying HyperKahler
Kummer 8-orbifolds
Lea
Bottini (Oxford): The categorical Landau paradigm
and Haagerup symmetry
Bruno
Alexandre(Imperial): Higgs Mechanism in Plebanski Gravity
Altay Etkin (Southampton) and Sayyded Rassouli (Nottingham):
Lower Dimensional Henneaux-Teitelboim gravity
Elias Furrer (Birmingham): Coulomb Branch
Surgery
Kinga Gawrych (Imperial): Baryon Number
Violation and Constrained Instantons
Ludovic
Fraser-Taliente (Oxford):
F-extremization determines certain large-N CFTs
Andrian
Sanchez Garrido (Southampton):
Krylov complexity, chords and two-dimensional
gravity
Max Hutt (Imperial): Generalised
symmetries in linear gravity
Jieming Lin (Imperial): CY3 Consistent
Truncation to Pure Supergravity
Dmitri Riabchenko (City): Dressing factors and odd
crossing in mixed-flux AdS_3 backgrounds
Fridrich Valach (Hertfordshire): On higher
fermions in supergravity
Mitchell
Woolley (QMUL): 6d (2,0) W-algebras and the superconformal bootstrap