Poster Session and Gong Show

This event is intended for PhD participants and will take place on Wednesday 13 July. It will start with a 1 minute Gong-Show, followed by the poster discussion in the coffee break area.

We strongly encourage all PhD to register! The link is below and the deadline is June 29th. If you have questions about the event and format, please contact the organizers: Jackson Fliss and Akash Jain.

Update (on July 1st): Registration for the poster session is still open. If you are a PhD student attending the workshop, we strongly encourage you to participate!!

Registration Form Gong Show and Poster Session

1. Phase transition of photons and gravitons in a Casimir box

Ankit Aggarwal (UvA, Amsterdam; ULB, Brussels)

A first order phase transition for photons and gravitons in a Casimir box is studied analytically from first principles. It is closely related to Bose-Einstein condensation and accompanied by a quantum phase transition whose control parameter is the chemical potential for optical helicity.

2. Towards an “AdS₁/CFT₀” correspondence from the D(−1)/D7 system?

Sergio Ernesto Aguilar Gutierrez (KU Leuven)

We argue that a type IIB Euclidean supergravity solution of the form R × S¹ × T⁸ with imaginary self-dual F₁-flux through R × S¹ belongs to the chain of AdS_d × S^d × T^10−2d-vacua with imaginary self dual F_d flux, where d ≤ 5. Such vacua come from the near-horizon of D(d − 2)/D(8 − d) branes and are supersymmetric for odd values of d. For d = 1 we speculate that the hallmark of conformal symmetry for the matrix model dual is a vanishing free energy. The matrix dual was recently constructed by (Billo et al., 2021) by adding matrix interactions coming from strings stretching between the D(−1) and D7-branes to the IKKT matrix model. We find that the corresponding supergravity solution indeed has vanishing on-shell action. Specific F₅ fluxes need to be switched on as a consequence of (a T-dual version of) the Hanany-Witten effect.

3. Metastable states in the gravity dual of N = 1^∗

George Batzios (UvA)

4. Deformations of symmetric products

Suzanne Bintanja (UvA)

5. Cost of holographic path integrals

Ramesh Chandra (UvA)

6. Chaos, wormholes and holography

Jeremy van der Heijden (UvA)

7. Non-Lorentzian Supergravity and Dualities

Johannes Lahnsteiner (University of Groningen)

8. Exact stringy microstates from gauge theories

Ji Hoon Lee (Perimeter Institute)

We study how the microstates of BPS sectors in string theory are encoded in the dual U(N) gauge theory. The microstates take the form of a coherent sum of stacks of branes and their open/closed string excitations. We propose a prescription to construct the indices of string/brane configurations by analyzing the modifications of determinant operators in gauge theory. The strings and branes should be interpreted in the tensionless limit of string theory, but their indices are exact at finite N. In various examples, we provide evidence that a sum, of the giant graviton-type recently proposed in the literature, over all such configurations gives the finite N gauge theory index. Finally, we discuss how these microstates assemble in the BPS Hilbert space and in what circumstances the branes can form bound states to produce black hole degeneracies.

9. Relaxational hydrodynamics with Goldstone fields

Ruben Lier (Max Planck Institute for the Physics of Complex Systems)

We propose a general hydrodynamic framework for systems with spontaneously broken trans- lational symmetries suffering from weak explicit symmetry breaking. The second law of ther- modynamics naturally results in relaxation in the hydrodynamic equations, and enables us to derive a universal relation between damping and diffusion of pseudo-Goldstones. We discover entirely new physical effects sensitive to explicitly broken symmetries. We furthermore consider different a kind of imperfections in systems with spontaneous translational symmetry breaking, namely dislocations. These dislocations give rise to a dynamical reference metric which represents plasticity. We consider the most general hydrodynamic theory which includes such a dynamical reference metric and study the effects on transport, imposing weak plasticity.

10. OPE statistics

Diego Liska (UvA)

Using crossing symmetry and modular invariance, we explored some non-Gaussianities in the statistical distribution of OPE coefficients in chaotic 2d conformal field theories.

11. Euclidean SdS Action and Black Hole Creation Rate

Edward Morvan (UvA)

12. Quenched cooling of quantum systems and its relation to black holes

Vladimir Ohanesjan (Leiden University)

The dynamics when a hot many-body quantum system is brought into instantaneous contact with a cold many-body quantum system can be understood as a combination of early time quantum correlation (von Neumann entropy) gain and late time energy relaxation. We show that at the shortest timescales there is an energy increase in each system linked to the entropy gain, even though equilibrium thermodynamics does not apply. This energy increase is of quantum origin and results from the collective binding energy between the two systems. Counter-intuitively, this implies that also the hotter of the two systems generically experiences an initial energy increase when brought into contact with the other colder system. In the limit where the energy relaxation overwhelms the (quantum) correlation build up, classical energy dynamics emerges where the energy in the hot system decreases immediately upon contact with a cooler system. We use both strongly correlated SYK systems and weakly correlated mixed field Ising chains to exhibit these characteristics, and comment on its implications for both black hole evaporation and quantum thermodynamics.

13. Integer conformal dimensions for type IIa flux vacua

Filippo Revello (University of Oxford)

We give a concise argument that supersymmetric anti–de Sitter type IIA DeWolfe-Giryavets- Kachru-Taylor flux vacua on general Calabi-Yau’s have, interpreted holographically, integer conformal dimensions for low-lying scalar primaries in the dual conformal field theory. These integers are independent of any compactification details, such as the background fluxes or triple intersection numbers of the compact manifold. For the Kähler moduli and dilaton, there is one operator with ∆ = 10 and h_1,1 operators with ∆ = 6, whereas the corresponding axions have ∆ = 11 and ∆ = 5. For the complex structure moduli, the h2,1 saxions have ∆ = 2, and the axions ∆ = 3. We give a tentative discussion of the origin of these integers and effects that would modify these results.

14. Painlevé I and exact WKB: Stokes phenomenon for two-parameter transseries

Alexander van Spaendonck (UvA)

15. Antifragile Persistent Homology for LSS

Karthik Viswanathan (UvA)

Persistent Homology computes the topology of datasets at different length scales. It is observed that persistent homology contains an informative summary of the observables in various physical systems. In this poster, we discuss its applications to problems in Cosmology and String Theory, more specifically, probing non-Gaussianities in the Large Scale Structure of the universe.

16. One-dimensional quantum gravity and the Schwarzian theory

Stathis Vitouladitis (UvA)

We develop a model of one-dimensional (conformal) quantum gravity. By discussing the connection between Goldstone and gauge theories, we establish that this model effectively computes the partition function of the Schwarzian theory where the symmetry is realised on the base space. The computation is straightforward, involves a local quantum measure and does not rely on localization arguments. Non-localities in the model are exclusively related to the value of fixed gauge invariant moduli. Furthermore, we study the properties of these models when all degrees of freedom are allowed to fluctuate. We discuss the UV finiteness properties of these systems and the emergence of a Planck’s length.

Poster Session and Gong Show

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