Large deviations for the boundary driven symmetric simple exclusion process

TL;DR

This paper establishes a large deviation principle for the empirical density of a non-equilibrium symmetric simple exclusion process with boundary interactions, linking dynamical and static variational characterizations of fluctuations.

Contribution

It proves a dynamical large deviation principle for the process and connects the quasi potential to a static variational problem, extending understanding to non-reversible systems.

Findings

Large deviation principle for empirical density established

Quasi potential characterized via variational problems

Connection made between dynamical and static fluctuation descriptions

Abstract

The large deviation properties of equilibrium (reversible) lattice gases are mathematically reasonably well understood. Much less is known in non--equilibrium, namely for non reversible systems. In this paper we consider a simple example of a non--equilibrium situation, the symmetric simple exclusion process in which we let the system exchange particles with the boundaries at two different rates. We prove a dynamical large deviation principle for the empirical density which describes the probability of fluctuations from the solutions of the hydrodynamic equation. The so called quasi potential, which measures the cost of a fluctuation from the stationary state, is then defined by a variational problem for the dynamical large deviation rate function. By characterizing the optimal path, we prove that the quasi potential can also be obtained from a static variational problem introduced by Derrida, Lebowitz, and Speer.