Program

13:00 Tea & Coffee
13:30 Luca Delacretaz (UChicago) - The ETH and its occasional violations in holographic and generic QFTs
14:45 Coffee break
15:15 Damian Galante (KCL) - On the holographic renormalization group flow (in SYK)
16:30 Borrel (drinks and snacks), at Polder (Polderzaal)

Abstracts

Luca Delacretaz (UChicago) 
The ETH and its occasional violations in holographic and generic QFTs

Abstract: The Eigenstate thermalization hypothesis (ETH) plays a central role in our understanding of thermalization in closed quantum many-body systems. However, it is not a necessary condition for thermalization -- certain chaotic systems feature "scar" states, hidden within the dense spectrum of thermal states, that violate ETH. I will show that such states occur in all holographic CFTs with a U(1) symmetry whose bulk satisfies the weak gravity conjecture. I will then present a mechanism for scars in weakly coupled QFTs, and, with the help of Hamiltonian truncation numerics, discuss expectations for generic non-holographic QFTs.

Damian Galante (KCL) 
On the holographic renormalization group flow (in SYK)

Abstract: The SYK model is a quantum mechanical model of N Majorana fermions with random all-to-all interactions. In the large N limit and in the strong coupling regime, it has an emergent conformal symmetry that links the model to gravity in (near) AdS_2. In this talk, I will present new solvable relevant deformations of the model, that allow for novel infrared behaviour that can be studied both numerically and analytically. I will concentrate on two-point correlators, thermodynamics, Schwarzian actions and its relation to their putative dual dilaton-gravity models. Time permitting, I will speculate on possible microscopic constructions of dS_2.

Location

L1.01, LAB42 Building, Science Park 904, Amsterdam.

**Notice unusual location. This is a new building just next to where we usually organise.

About

This event is part of a regular series of meetings sponsored by Delta ITP with the objective of bringing together the theoretical physics communities in Amsterdam, Leiden, Utrecht and our sister nodes Groningen, Brussels (ULB and VUB) and Leuven. The topic of this meeting is holography and its applications to different physical systems. We encourage researchers from different areas in theoretical physics to participate!

Organisers

Diego Hofman Uv Amsterdam
Umut Gursoy Utrecht Un.
Koenraad Schalm Leiden Un.