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Meeting at King’s College
London 10 January 2024 |
Organising Committee: J. Gauntlett, P. Kumar, N. Lambert, C. Papageorgakis,
S. Ross, S. Schafer-Nameki, D. Tong and D. Turton
Less Tentative Schedule:
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Wednesday January 10th 2024 |
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10:30 |
Registration |
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11:00 |
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11:25 |
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11:50 |
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12:15 |
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13:00 |
Lunch and Poster Session |
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14:15 |
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14:40 |
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15:05 |
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15:30 |
Break |
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16:15 |
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16:40 |
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17:05 |
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17:30 |
Reception |
Link
to Video Recording (unedited)
Directions:
The talks will take place in the Safra Lecture Theatre.
This is on the ground floor in the main King’s building on the Strand. Lunch,
refreshments and the reception will be served in the Great Hall next to the Safra Lecture Theatre where the posters will also be on
display.
Please note that to gain entry to King’s you will need to be registered.
Talks:
Andrea
Boido (Oxford): Matrix models from black hole geometries
Supersymmetric and magnetically charged black
holes in AdS$_4$ are known to be holographically dual to 3d SCFTs compactified
on a Riemann surface $\Sigma_g$ with a topological
twist. In the last decade, many observables have been computed on both sides
and a remarkable matching has been achieved. In field theory, the partition
function is computed via localization, and it reduces to a matrix model whose
eigenvalues, at large N, become continuously distributed. In the talk, I will
explain how the eigenvalue density function emerges naturally in gravity from
the near-horizon geometry of the black holes. The ABJM theory will serve as a
concrete illustration of this picture.
Lewis
Cole (Swansea): Integrable Deformations from Holomorphic Chern-Simons Theory on Twistor Space
Integrable deformations are a subclass of 2d
sigma-models which are exactly solvable. Insights into the origin of this
special property are provided by two 4d gauge theoretic descriptions -- 4d Chern-Simons theory and self-dual Yang-Mills theory.
Recently, both of these 4d models have been realised
as children of a parent theory: 6d holomorphic Chern-Simons
theory on twistor space. After a review of these topics, I will discuss our
work extending this formalism, beyond the 2d PCM and WZW model, to continuous
families of integrable deformations.
Max
Downing (KCL): Free fermions, KdV
charges, generalised Gibbs ensembles and modular transforms.
We consider the modular properties of
generalised Gibbs ensembles in the Ising model,
realised as a theory of one free massless fermion. The Gibbs ensembles are
given by adding chemical potentials to chiral charges corresponding to the KdV conserved quantities. The eigenvalues and Gibbs
ensembles for the charges are calculated exactly using their expression as bilinears in the fermion fields. By considering the
corresponding TBA calculation, we derive the exact closed-form expression of
the GGE in the opposite channel. We end with an interpret of this transformed
GGE in terms of a line defect.
Tancredi
Schettini Gherardini
(QMUL): Exotic Spheres and
Kaluza-Klein Formalism
I will discuss metrics on exotic spheres
viewed as non-principal S^3 bundles over S^4, i.e. Milnor's bundles,
summarising the findings presented in arXiv:2309.01703 (to appear on JHEP). I
will outline the importance of these manifolds in differential geometry,
mention the appearance of exotic differentiable structures in physics so far,
and then present in detail an explicit Kaluza-Klein metric for one of the
exotic spheres. I will comment on its relation to 7-dimensional Einstein
gravity with a cosmological constant and its possible role in supergravity
theories. Finally, I will discuss some interesting extensions of this work,
which lies within a little-explored, but potentially fruitful, territory.
David
Katona (Edinburgh): Uniqueness of the extremal Schwarzschild-de Sitter spacetime
Uniqueness theorems for black holes with a
cosmological constant are only known in a few limited cases. In my talk I
present a recently proven uniqueness theorem for the extremal Schwarzschild-de
Sitter black hole in the class of analytic vacuum spacetimes with a positive
cosmological constant containing a static extremal Killing horizon. The proof
is based on establishing the uniqueness of transversal deformations to the
near-horizon geometry at every order. I discuss possible generalisations,
including black holes in Einstein-Maxwell theory with a cosmological
constant and higher dimensional black holes.
Mang Hei Gordon Lee (Cambridge): In-Out formalism for In-In correlators
Cosmological correlators are commonly studied
using the in-in formalism developed by Schwinger and Keldysh.
Because of the time contour, computation using in-in formalism usually involves
a much larger number of Feynman diagrams than usual amplitude calculations.
However, for non-dissipative systems, in-in correlators can simply be computed
using the familiar in-out formalism used for amplitudes. I will explore this
connection and its applications in flat space. In the end I will also explore
how this can potentially be used to define a scattering amplitude in de Sitter.
Veronica
Pasquarella (Cambridge): Moore-Tachikawa
Varieties: Beyond Duality
In this talk I propose a generalisation of
the Moore-Tachikawa varieties for the case in which
the target category of the 2D TFT is a hyperkaehler
quotient. The setup requires generalising the bordism
operators of Moore and Segal to the case involving lack of reparametrisation-invariance
on the Riemann surface, ultimately enabling to relate this to the issue of
defining a Drinfeld center
for composite class S theories. (This talk is based on a recently published
paper.)
Evyatar
Sabag (Oxford): Swampland Constraints on
the SymTFT of Supergravity
We consider
string/M-theory reductions on a compact space X = X^loc
∪ X^◦, where X^loc contains the singular locus, and X^◦ its complement.
For the resulting supergravity theories, we construct a suitable Symmetry
Topological Field Theory (SymTFT) associated with the
boundary ∂X^loc ∪ ∂X^◦.
We propose that boundary conditions for different BPS branes wrapping the same
boundary cycles must be correlated for the SymTFT to
yield an absolute theory consistent with quantum gravity. Furthermore, for 6d
(2, 0) theories, we utilize a subtle interplay between gauged 0-, 2-, and
4-form symmetries to provide a bottom-up explanation of the correlated boundary
conditions in K3 compactifications of type IIB.
Stav
Zalel (Imperial): The in-in formalism on a causal set
In causal set quantum gravity, spacetime is
fundamentally discrete and takes the form of a Lorentzian lattice. I will
describe recent work in defining interacting quantum field theory on this
discrete background lattice. I will present diagrammatic rules for computing
in-in correlators in the vacuum which are manifestly causal thanks to the
appearance of the retarded propagator. When the interaction region is finite,
the expansion in powers of the interaction coupling terminates at a finite
order. This suggests a new way to regularise the continuum theory. Overall,
this framework is a major step in providing new quantum gravity phenomenology
by allowing us to compute early universe observables under the assumption that
spacetime is fundamentally discrete.
Pietro Capuozzo (Southampton): Holographic Superconformal Defects
Calvin Chen
(Imperial): Stacking and balancing casual causality –
Diagnosing (a)causality in the EFT of gravity
Chandramouli
Chowdhury (Southampton): Cosmological Correlators in
Momentum Space
Osama Khlaif (Birmingham): 3d N=2 SQCD
and the quantum K-theory of the Grassmannian
Enrico Marchetto (Oxford): Symmetry
Breaking and Tauberian Theorems in finite temperature
CFTs
Gerben Oling (Edinburgh): Carroll Geometry in Gravity and Holography
Arvind
Shekar (Southampton): Entanglement Entropy and
theories that yield islands in d dimensional static black holes
Torben Skrzypek (Imperial): Probing the
twisted sector of AdS/CFT orbifolds
Benjamin Suzzoni (Southampton): Holographic Weyl Anomalies of 4d Defects in 6d SCFT’s
Neil Talwar
(Swansea): Information recovery in JT gravity
Mitchell
Woolley (QMUL): New Conformal Bootstrap Strategies with
Applications in 1d