Strings 2022

Session

Gong Show

21 Jul 2022, 16:30

Audimax (University of Vienna)

Presentation materials

Gong Show recording

Prizes recording

9. A modern view on Universal Asymptotic Formulae in 2d CFTs

Ioannis Tsiares (Institut de Physique Theorique, CEA-Saclay)

Gong Show Talk

Two-dimensional Conformal Field Theories (CFTs) are defined via a list of primary operators, along with their scaling dimensions, spins and OPE coefficients. This set of data, along with the central charge, uniquely defines any correlation function of the theory on an arbitrary Riemann surface. Using consistency conditions like crossing symmetry and modular invariance, one can show that there...

68. Black hole perturbations from Liouville correlators

Cristoforo Iossa (SISSA, Trieste; INFN, Trieste)

Gong Show Talk

Reversing the logic of the bootstrap approach in Liouville CFT we explicitly compute the connection formulae for degenerate conformal blocks. In the semiclassical limit of the theory, this amounts to solving the connection problem of Fuchsian ODEs. Generalizing to irregular insertions we solve as well for various confluences. Concentrating on the Heun equation and its confluences, we can solve...

173. Cauchy Slice Holography

Goncalo Araujo-Regado (University of Cambridge)

Gong Show Talk

We show how to construct an explicit map between boundary states and quantum gravity states in AdS/CFT via a specific field theory path integral on a bulk Cauchy slice, rather than on the asymptotic boundary. The field theory is constructed from the boundary CFT via an irrelevant deformation, which is the analogue of the well-known $T\bar{T}$ operator in two boundary dimensions. Our...

159. Celestial Operator Product Expansions and ${\rm w}_{1+\infty}$ Symmetry

Elizabeth Himwich

Gong Show Talk

The Lorentz symmetry of four-dimensional (4D) scattering is isomorphic to two-dimensional (2D) global conformal symmetry. As a consequence, amplitudes in 4D momentum space can be naturally recast via a Mellin transform as correlation functions of 2D ''celestial'' conformal primary operators. In this talk, I will describe results (with M. Pate and K. Singh) on operator product expansions of...

165. Degenerate Microstate Solutions: At Moduli Space's End

Yixuan Li (IPhT Saclay)

Gong Show Talk

Large classes of supergravity solutions that appear to be coherent microstates of the D1-D5-P black hole have been found by the Microstate Geometries program. These solutions have a smooth cap at the bottom of a long but finite throat, replacing the black hole's horizon lying at the bottom of an infinitely-long throat. Because of gravitational blueshift, a small amount of energy as seen from...

111. Fractons on curved space and their soft charges

Stefan Prohazka (University of Edinburgh)

Gong Show Talk

Fractons are quasiparticles with the distinctive feature of having only limited mobility. This bizarre trait and their unusual symmetries also make the coupling to curved spacetime nontrivial. I will show how aristotelian geometry provides the right framework, review the state-of-the-art on this issue, provide a novel no-go theorem for theories with linear dipole symmetry, spatial derivatives...

175. Holomorphic QFTs: Higher Structures and Bootstrap

Mr Justin Kulp (Perimeter Institute)

Gong Show Talk

4d holomorphic QFTs (such as those obtained from twisting N=1 QFTs) are endowed with extra structures and symmetries which are a 4d analogue of a 2d chiral algebra. In this talk, I will describe these holomorphic theories, higher structures that arise in studying loop corrections to the BRST differential, and a recursive "bootstrap" procedure for systematically computing these loop...

168. Large-charge expansions and Resurgence.

Nicola Andrea Dondi (University of Bern)

Gong Show Talk

The conformal data of generic CFTs involving heavy charged operators can be organised as a series in inverse powers of the global charges involved. When extrapolating these expansions to light low-charge sectors, is it relevant to ask whether these series are divergent and Borel-summable. In this talk, I will show that the O(N) scalar CFT has a large-charge expansion which is not...

12. Microstates of the Non-Supersymmetric Two-Dimensional Black Hole: A Boundary Decription

Ronak Soni (DAMTP, University of Cambridge)

Gong Show Talk

In the matrix quantum mechanics (MQM) dual to the non-supersymmetric 2d black hole, we identify a set of degenerate states as the black hole microstates. At leading order in large $N$, the log of number of these states (already calculated by Gross and Klebanov) matches the Bekenstein-Hawking entropy formula, and also agrees with one of two candidates found by Kazakov and Tseytlin. The mass...

21. Physical Protocols for Recovering Information in Quantum Gravity

Olga Papadoulaki

Gong Show Talk

I will present two protocols, that observers localized near the boundary of a spacetime can use to recover information about bulk excitations. The first protocol will be for the case of an asymptotically AdS spacetime and the second for an asymptotically flat spacetime. Although the specifics of the two protocols differ, they both demonstrate the principle of holography of information ---the...

30. PQ Axiverse

Naomi Gendler

Gong Show Talk

We show that the strong CP problem is solved in a large class of compactifications of string theory. The Peccei-Quinn mechanism solves the strong CP problem if the CP-breaking effects of the ultraviolet completion of gravity and of QCD are small compared to the CP-preserving axion potential generated by low-energy QCD instantons. We characterize both classes of effects. To understand quantum...

98. Quantum Complexity as Hydrodynamics

Pablo Basteiro

Gong Show Talk

As a new step towards defining complexity for quantum field theories, we map Nielsen operator complexity for $SU(N)$ gates to two-dimensional hydrodynamics. We develop a tractable large $N$ limit that leads to regular geometries on the manifold of unitaries as $N$ is taken to infinity. To achieve this, we introduce a basis of non-commutative plane waves for the $\mathfrak{su}(N)$ algebra and...

11. Rebooting quarter-BPS operators in N=4 Super Yang-Mills

Andrea Manenti (Uppsala University)

Gong Show Talk

I will discuss the analytic bootstrap technique applied to holographic superconformal field theories. In particular I will focus on $\mathcal{N}=4$ Super Yang-Mills and study correlators of quarter-BPS operators. Despite the fact that they are less protected than their half-BPS counterparts, these correlators can be constrained via the chiral algebra twist and this information is enough to...

162. Where is the minimal 5d pure supergravity?

Houri Christina Tarazi

Gong Show Talk

The five dimensional pure supergravity with 8 supercharges contains no dilaton making its string theory realization hard to get.
I will be discussing previous attempts to realize the theory through non geometric constructions and provide reasons why this approach will fail. Additionally, I will discuss properties of the mysterious theory to assess its potential consistency as a quantum...