Einstein’s fluctuation relation and Gibbs states far from equilibrium

Lazarescu, Alexandre
(2020) Journal of Physics A: Mathematical and Theoretical — Vol. 53, n° 40 (2020)

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  • Lazarescu, Alexandreorcid-logoUCLouvain
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Abstract
We examine a class of one-dimensional lattice-gases characterised by a gradient condition which is a necessary and sufficient condition for the existence of Gibbs-type homogeneous stationary states. We show how, defining appropriate boundary conditions, this condition leads to a novel fluctuation relation under reservoir exchange, unrelated to the Gallavotti-Cohen symmetry. We show that it can be interpreted as a nonequilibrium and nonlinear generalisation of Einstein's relation, leading to Onsager reciprocity relations in the limit of a small reservoir imbalance. We illustrate these results with two examples.
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Lazarescu, A. (2020). Einstein’s fluctuation relation and Gibbs states far from equilibrium. Journal of Physics A: Mathematical and Theoretical, 53(40). https://doi.org/10.1088/1751-8121/abae40 (Original work published 2020)