English

Hydrodynamic limit of simple exclusion processes in symmetric random environments via duality and homogenization

Probability 2022-06-03 v3 Mathematical Physics Analysis of PDEs math.MP

Abstract

We consider continuous-time random walks on a random locally finite subset of Rd\mathbb{R}^d with random symmetric jump probability rates. The jump range can be unbounded. We assume some second--moment conditions and that the above randomness is left invariant by the action of the group G=Rd\mathbb{G}=\mathbb{R}^d or G=Zd\mathbb{G}=\mathbb{Z}^d. We then add a site-exclusion interaction, thus making the particle system a simple exclusion process. We show that, for almost all environments, under diffusive space-time rescaling the system exhibits a hydrodynamic limit in path space. The hydrodynamic equation is non-random and governed by the effective homogenized matrix DD of the single random walk, which can be degenerate. The above result covers a very large family of models including e.g. simple exclusion processes built from random conductance models on Zd\mathbb{Z}^d and on crystal lattices (possibly with long conductances), Mott variable range hopping, simple random walks on Delaunay triangulations, random walks on supercritical percolation clusters.

Keywords

Cite

@article{arxiv.2011.11361,
  title  = {Hydrodynamic limit of simple exclusion processes in symmetric random environments via duality and homogenization},
  author = {Alessandra Faggionato},
  journal= {arXiv preprint arXiv:2011.11361},
  year   = {2022}
}

Comments

43 pages. Minor corrections and extensions. Extended Section 5 with further applications. Added new Appendix A with an example of degenerate nonzero effective homogenized matrix