1. instantaneous thermalization in dilute gas phase of syk model

Sorokhaibam Nilakash Singh

NISER Bhubaneshwar, India

7 April 2021 Wed 2 pm

                                      IBS Center for Theoretical Physics of Complex Systems (PCS), Administrative Office (B349), Theory Wing, 3rd floor

                                      Expo-ro 55, Yuseong-gu, Daejeon, South Korea, 34126 Tel: +82-42-878-8633                     

SYK model is a fermionic many-body system which has been a subject of intense research interest in different fields of physics. It is a strongly correlated system in which the fermions have all-to-all random interaction. Using different diagnostic tools, it has been shown that this model is highly chaotic. As a highly chaotic system, it thermalizes exponentially fast. This can be seen from non-equilibrium time evolution of Green's functions. Even macroscopic quantity like effective temperature settles down exponentially fast. Interestingly, SYK model also has a lesser known dilute gas phase which consists of long lived quasiparticles at very low density. Surprisingly, we found that the system in this phase thermalizes instantaneously. The underlying physics for this phenomenon is expected to be very different from the usual chaotic dynamics of a many-body system. This talk is based on the preprint arXiv: 2004.14376 (recently accepted for publication).