# Thermalization and Chaos in 1+1d QFTs

- Institution: CERN
- Department: TH institutes
- Speaker: Luca Delacrétaz
- Year: 2022
- Language: English
- Subjects: Physics
- Source: [CERN](https://videos.cern.ch/record/3015338)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

Nonintegrable QFTs are expected to thermalize and exhibit emergence of hydrodynamics and chaos. In weakly coupled QFTs, kinetic theory captures local thermalization; such a versatile tool is absent away from the perturbative regime. I will present analytical and numerical results using nonperturbative methods to study thermalization at strong coupling. I will show how requiring causality in the thermal state leads to strong analytic constraints on the thermodynamics and out of equilibrium properties of any relativistic 1+1d QFT. I will then discuss Lightcone Conformal Truncation (LCT) as a powerful numerical tool to study thermalization of QFTs. Applied to $\phi^4$ theory in 1+1d, LCT reveals eigenstate thermalization and onset of random matrix universality at any nonzero coupling. Finally, I will discuss prospects for observing the emergence of hydrodynamics in QFTs using Hamiltonian truncation.

## Lectures

1. [Thermalization and Chaos in 1+1d QFTs](https://invisiblenetwork.ai/learn/cern/3015338/020ab8ffbbf2), 1 h 28 min (CERN's player)