Feller and ergodic properties of jump-move processes with applications to interacting particle systems - Archive ouverte HAL Access content directly
Preprints, Working Papers, ... Year : 2022

Feller and ergodic properties of jump-move processes with applications to interacting particle systems

Ronan Le Guével
Emilien Manent
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Abstract

We consider Markov processes that alternate continuous motions and jumps in a general locally compact polish space. Starting from a mechanistic construction, a first contribution of this article is to provide conditions on the dynamics so that the associated transition kernel forms a Feller semigroup, and to deduce the corresponding infinitesimal generator. In a second contribution, we investigate the ergodic properties in the special case where the jumps consist of births and deaths, a situation observed in several applications including epidemiology, ecology and microbiology. Based on a coupling argument, we obtain conditions for the convergence to a stationary measure with a geometric rate of convergence. Throughout the article, we illustrate our results by general examples of systems of interacting particles in R d with births and deaths. We show that in some cases the stationary measure can be made explicit and corresponds to a Gibbs measure on a compact subset of R d. Our examples include in particular Gibbs measure associated to repulsive Lennard-Jones potentials and to Riesz potentials.
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hal-03632962 , version 1 (06-04-2022)

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Frédéric Lavancier, Ronan Le Guével, Emilien Manent. Feller and ergodic properties of jump-move processes with applications to interacting particle systems. 2022. ⟨hal-03632962⟩

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