Periodic TASEP with general initial conditions

TL;DR

This paper derives explicit multi-point distribution formulas for the periodic TASEP with general initial conditions, analyzes their large-time behavior, and extends known results to new initial conditions in a periodic setting.

Contribution

It provides explicit formulas and large-time limits for the periodic TASEP with various initial conditions, extending previous results beyond step initial conditions.

Findings

Explicit multi-point distribution formulas in terms of Fredholm determinants.

Large-time limit results for step, flat, and step-flat initial conditions.

Extension of previous TASEP results to periodic domain with general initial conditions.

Abstract

We consider the one-dimensional totally asymmetric simple exclusion process with an arbitrary initial condition in a spatially periodic domain, and obtain explicit formulas for the multi-point distributions in the space-time plane. The formulas are given in terms of an integral involving a Fredholm determinant. We then evaluate the large-time, large-period limit in the relaxation time scale, which is the scale such that the system size starts to affect the height fluctuations. The limit is obtained assuming certain conditions on the initial condition, which we show that the step, flat, and step-flat initial conditions satisfy. Hence, we obtain the limit theorem for these three initial conditions in the periodic model, extending the previous work on the step initial condition. We also consider uniform random and uniform-step random initial conditions.