Current fluctuations in stochastic lattice gases.

L. Bertini,A. Sole,D. Gabrielli,G. Jona-Lasinio,C. Landim

Published 2004 in Physical Review Letters

ABSTRACT

We study current fluctuations in lattice gases in the macroscopic limit extending the dynamic approach for density fluctuations developed in previous articles. More precisely, we establish a large deviation theory for the space-time fluctuations of the empirical current which include the previous results. We then estimate the probability of a fluctuation of the average current over a large time interval. It turns out that recent results by Bodineau and Derrida [Phys. Rev. Lett. 92, 180601 (2004)]] in certain cases underestimate this probability due to the occurrence of dynamical phase transitions.

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