Author: saso

Time: 15:00 instead of the usual 13:00

Title:
“Holography abhors visible trapped surfaces”

Abstract:
One of the main consequences of the weak cosmic censorship conjecture is that trapped surfaces are hidden by event horizons. We prove that the holographic dictionary implies this result. In particular, we show that the existence of a trapped surface implies the existence of an event horizon, and that this event horizon must be outside of the trapped surface. We make few assumptions beyond the absence of evaporating singularities in the strictly classical gravity limit: thus our result provides a holographic derivation of a hallmark consequence of the longstanding weak cosmic censorship conjecture. We discuss the possibility that a classical gravity theory that admits AdS solutions with trapped surfaces outside of a horizon is not holographic and possibly has no consistent UV completion. We comment on a connection to chaos and holographic complexity.

Slides:

Title:
“Stress tensor sector of Holographic CFTs”

Abstract:
The stress tensor sector in holographic CFTs corresponds to multi-graviton contributions to correlation functions in dual AdS theory. In this talk, we will show how one can use the lightcone bootstrap to fix all dynamical data of multi-stress tensors with spin greater then 2, i.e. their operator product expansion (OPE) coefficients. We will show that a subset of stress tensor sector that consists of operators with minimal twist, have OPE coefficients that do not depend on the particular choice of holographic CFT and are therefore universal. 

Slides:

Time: 15:00 instead of the usual 13:00

Title:
“Transasymptotics, dynamical systems and far from equilibrium fluid dynamics”

Abstract:
Hydrodynamics is a physical theory which describes long wavelength phenomena.  Any introductory physics textbook indicates that the applicability of hydrodynamics is restricted to be near to local thermal equilibrium. This assumption seems to be very restrictive given the overwhelming experimental evidence of fluid behavior seen in nucleus-nucleus collisions and cold atoms systems. The fact that hydrodynamics can be applied to these non-equilibrated physical systems calls for a better understanding of the foundations of hydrodynamics. 

In this talk I will discuss the most recent developments of the theory for in and out of equilibrium fluids. I shall present new theoretical results related to the emergence of hydrodynamic attracting behavior, non-hydrodynamic transport and its relation with transasymptotics and trasseries. I shall also introduce in a pedagogical manner a new set of mathematical tools used frequently to analyze dynamical systems in the context of hydrodynamics. I will conclude by discussing new possibilities for future research directions.

Slides: