Diffusive limit of lattice gas with mixing conditions. (English) Zbl 0947.60089

Summary: We prove, under certain mixing conditions, that the hydrodynamical limit of a stochastic lattice gas on the cubic lattice \(\mathbf Z^d\) is governed by a nonlinear diffusion equation. Following S. R. S. Varadhan [in: Asymptotic problems in probability theory: Stochastic models and diffusions on fractals. Pitman Res. Notes Math. Ser. 283, 75-128 (1993; Zbl 0793.60105)], we characterize the diffusion coefficient by a variational formula, which is equivalent to the Green-Kubo formula. The fluctuation-dissipation equation is established rigorously as an important step of the proof. Our mixing conditions are implied by the Dobrushin-Shlosman mixing conditions which are always valid at high temperatures.


60K35 Interacting random processes; statistical mechanics type models; percolation theory
82C22 Interacting particle systems in time-dependent statistical mechanics


Zbl 0793.60105
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