Fluctuations of TASEP on a ring in relaxation time scale

TL;DR

This paper analyzes the fluctuation behavior of the TASEP on a ring during the relaxation time scale, revealing the transition from KPZ to equilibrium dynamics and deriving limiting distributions using Bethe ansatz.

Contribution

It provides explicit formulas for finite-time distributions of TASEP on a ring and characterizes the crossover from KPZ to equilibrium fluctuations.

Findings

Identifies the relaxation time scale as proportional to the 3/2 power of the ring size.

Derives explicit limiting distributions for particle fluctuations.

Shows the crossover from KPZ to equilibrium dynamics in TASEP.

Abstract

We consider the totally asymmetric simple exclusion process on a ring with flat and step initial conditions. We assume that the size of the ring and the number of particles tend to infinity proportionally and evaluate the fluctuations of tagged particles and currents. The crossover from the KPZ dynamics to the equilibrium dynamics occurs when the time is proportional to the 3/2 power of the ring size. We compute the limiting distributions in this relaxation time scale. The analysis is based on an explicit formula of the finite-time one-point distribution obtained from the coordinate Bethe ansatz method.