Large deviations and chemical potential in bulk-driven systems in contact

Abstract

We study whether the stationary state of two bulk-driven systems slowly exchanging particles can be described by the equality of suitably defined nonequilibrium chemical potentials. Our main result is that in a weak contact limit, chemical potentials can be defined when the dynamics of particle exchange takes a factorized form with respect to the two systems, and satisfies a macroscopic detailed balance property at large deviation level. The chemical potentials of systems in contact generically differ from the nonequilibrium chemical potentials of isolated systems, and do not satisfy an equation of state. Yet, classes of systems satisfying the zeroth law of thermodynamics can be defined in a natural way. These results are illustrated on a driven lattice particle model and on an active particle model. The case when a chemical potential cannot be defined also has interesting consequences, like a non-standard form of the grand-canonical ensemble.

7 pages, 1 figure

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Cited by in corpus (8)

• Phase coexistence of active Brownian particles
• Macroscopic Stochastic Thermodynamics
• Lack of an equation of state for the nonequilibrium chemical potential of gases of active particles in contact
• Nonequilibrium chemical potentials of steady-state lattice gas models in contact: A large-deviations approach
• Nonequilibrium grand-canonical ensemble built from a physical particle reservoir
• Uphill migration in coupled driven particle systems
• Non-additive large deviations function for the particle densities of driven systems in contact
• Work to insert a particle into an active fluid