Stochastic Coalescence Multi-Fragmentation Processes

TL;DR

This paper develops a mathematical framework for infinite particle systems undergoing mass-dependent coalescence and fragmentation, establishing existence, regularity, and the Feller property using Wasserstein-type distances.

Contribution

It introduces a rigorous construction of infinite coalescence-fragmentation processes with H"older regularity conditions, expanding the theoretical understanding of such systems.

Findings

Existence of infinite coalescence-fragmentation processes as strong Markov processes

Processes possess the Feller property under specified conditions

Use of Wasserstein-type distance effectively analyzes coalescence phenomena

Abstract

We study infinite systems of particles which undergo coalescence and fragmentation, in a manner determined solely by their masses. A pair of particles having masses $x$ and $y$ coalesces at a given rate $K(x,y)$. A particle of mass $x$ fragments into a collection of particles of masses $\theta\_1 x, \theta\_2 x, \ldots$ at rate $F(x) \beta(d\theta)$. We assume that the kernels $K$ and $F$ satisfy H\"older regularity conditions with indices $\lambda \in (0,1]$ and $\alpha \in [0, \infty)$ respectively. We show existence of such infinite particle systems as strong Markov processes taking values in $\ell\_{\lambda}$, the set of ordered sequences $(m\_i)\_{i \ge 1}$ such that $\sum\_{i \ge 1} m\_i^{\lambda} \textless{} \infty$. We show that these processes possess the Feller property. This work relies on the use of a Wasserstein-type distance, which has proved to be particularly well-adapted to coalescence phenomena.