GQFI-UGent-WST Seminar: Luca Delacretaz "Thermal aspects of 2d QFTs"
In this talk, Luca Delacretaz (Kadanoff Center for Theoretical Physics, U. of Chicago) presents general constraints on (1+1)d QFTs obtained by imposing causality in the thermal state. One immediate consequence is the existence of a thermodynamic C-function, providing an alternative proof to Zamolodchikov's C-theorem. Similar considerations fix the sign of the TT-bar correction in non-integrable EFTs. Causality also severely constrains the out-of-equilibrium dynamics, by placing a strong lower bound on the local equilibration time beyond which hydrodynamics emerges as an effective description. This establishes the conjectured "Planckian bound" on thermalization in the context of (1+1)d QFTs.
The Virtual Seminar Series “GQFI-Ghent University-Warsaw String Theory” (GQFI-UGent-WST) is a joint initiative between the strings/holography groups at the Albert Einstein Institute (AEI) in Potsdam, Ghent University and the University Warsaw. The calendar for upcoming GQFI-UGent-WST seminars can be found here: https://gqfi.aei.mpg.de/node/3.
This talk is primarily based on arXiv:2105.02229 [hep-th] (https://arxiv.org/abs/2105.02229).
This talk was recorded on October 26th, 2021 at the Albert Einstein Institute in Potsdam-Golm.