An invariance principle for a class of non-ballistic random walks in random environment

摘要

We are concerned with random walks on , , in an i.i.d. random environment with transition probabilities -close to those of simple random walk. We assume that the environment is balanced in one fixed coordinate direction, and invariant under reflection in the coordinate hyperplanes. The invariance condition was used in Baur and Bolthausen (Ann Probab 2013, arXiv:1309.3169) as a weaker replacement of isotropy to study exit distributions. We obtain precise results on mean sojourn times in large balls and prove a quenched invariance principle, showing that for almost all environments, the random walk converges under diffusive rescaling to a Brownian motion with a deterministic (diagonal) diffusion matrix. Our work extends the results of Lawler (Commun Math Phys 87:81-87, 1982), where it is assumed that the environment is balanced in all coordinate directions.