Large Deviation of the Density Profile in the Steady State of the Open Symmetric Simple Exclusion Process

Abstract

We consider an open one dimensional lattice gas on sites $i=1,...,N$, with particles jumping independently with rate 1 to neighboring interior empty sites, the {\it simple symmetric exclusion process}. The particle fluxes at the left and right boundaries, corresponding to exchanges with reservoirs at different chemical potentials, create a stationary nonequilibrium state (SNS) with a steady flux of particles through the system. The mean density profile in this state, which is linear, describes the typical behavior of a macroscopic system, i.e., this profile occurs with probability 1 when $N\to \infty$. The probability of microscopic configurations corresponding to some other profile $\rho (x)$, $x=i/N$, has the asymptotic form $\exp [-N\mathcal{F}(\{\rho \})]$; $\mathcal{F}$ is the {\it large deviation functional}. In contrast to equilibrium systems, for which ${\mathcal{F}}_{eq}(\{\rho \})$ is just the integral of the appropriately normalized local free energy density, the $\mathcal{F}$ we find here for the nonequilibrium system is a nonlocal function of $\rho$. This gives rise to the long range correlations in the SNS predicted by fluctuating hydrodynamics and suggests similar non-local behavior of $\mathcal{F}$ in general SNS, where the long range correlations have been observed experimentally.

37 pages, in Latex, e-mail addresses: [email protected], [email protected], [email protected] This is a revised version with minor changes and corrections; the title has also been revised

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• Macroscopic fluctuation theory for stationary non equilibrium states
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