Thermalization and Hydrodynamics of Two-Dimensional Quantum Field Theories

Understand

We consider 2d QFTs as relevant deformations of CFTs in the thermodynamic limit.

• Using causality and KPZ universality, we place a lower bound on the timescale characterizing the onset of hydrodynamics.
• The bound is determined parametrically in terms of the temperature and the scale associated with the relevant deformation.
• This bound is typically much stronger than $\frac{1}{T}$, the expected quantum equilibration time.