Hydrodynamic limits and non-equilibrium fluctuations for the Symmetric Inclusion Process with long jumps

TL;DR

This paper studies the large-scale behavior and fluctuations of a long-range symmetric inclusion process, revealing non-local hydrodynamic equations and fluctuation limits modeled by generalized Ornstein-Uhlenbeck processes.

Contribution

It extends the analysis of inclusion processes to long-range jumps, establishing hydrodynamic limits and fluctuation results using self-duality and Mosco convergence.

Findings

Hydrodynamic limit is a non-local PDE.

Fluctuations converge to a generalized Ornstein-Uhlenbeck process.

Structural parallels with exclusion processes are extended to long-range interactions.

Abstract

We consider a d-dimensional symmetric inclusion process (SIP), where particles are allowed to jump arbitrarily far apart. We establish both the hydrodynamic limit and non-equilibrium fluctuations for the empirical measure of particles. With the help of self-duality and Mosco convergence of Dirichlet forms, we extend structural parallels between exclusion and inclusion dynamics from the short-range scenario to the long-range setting. The hydrodynamic equation for the symmetric inclusion process turns out to be of non-local type. At the level of fluctuations from the hydrodynamic limit, we demonstrate that the density fluctuation field converges to a time-dependent generalized Ornstein-Uhlenbeck process whose characteristics are again non-local.