Non-equilibrium dynamics for a Widom-Rowlinson type model with mutations

TL;DR

This paper studies the non-equilibrium dynamics of a continuum Widom-Rowlinson model with mutations, analyzing its evolution, invariant measures, ergodicity, and mesoscopic limits using correlation functions and Ruelle spaces.

Contribution

It introduces a dynamical continuum Widom-Rowlinson model with mutation, constructs its evolution via a Fokker-Planck equation, and proves ergodicity and chaos preservation.

Findings

Existence of a unique invariant measure.

Ergodicity with exponential rate.

Verification of chaos preservation in the mesoscopic limit.

Abstract

A dynamical version of the Widom-Rowlinsom model in the continuum is considered. The dynamics is modelled by a spatial two-component birth-and-death Glauber process where particles, in addition, are allowed to change their type with density dependent rates. An evolution of states is constructed as the unique weak solution to the associated Fokker-Planck equation. Such solution is obtained by means of its correlation functions which belong to a certain Ruelle space. Existence of a unique invariant measure and ergodicity with exponential rate is established. The mesoscopic limit is considered, it is related with the verification of the chaos preservation property.