## The Annals of Probability

### Exit laws from large balls of (an)isotropic random walks in random environment

#### Abstract

We study exit laws from large balls in $\mathbb{Z}^{d}$, $d\geq3$, of random walks in an i.i.d. random environment that is a small perturbation of the environment corresponding to simple random walk. Under a centering condition on the measure governing the environment, we prove that the exit laws are close to those of a symmetric random walk, which we identify as a perturbed simple random walk. We obtain bounds on total variation distances as well as local results comparing exit probabilities on boundary segments. As an application, we prove transience of the random walks in random environment.

Our work includes the results on isotropic random walks in random environment of Bolthausen and Zeitouni [Probab. Theory Related Fields 138 (2007) 581–645]. Since several proofs in Bolthausen and Zeitouni (2007) were incomplete, a somewhat different approach was given in the first author’s thesis [Long-time behavior of random walks in random environment (2013) Zürich Univ.]. Here, we extend this approach to certain anisotropic walks and provide a further step towards a fully perturbative theory of random walks in random environment.

#### Article information

Source
Ann. Probab., Volume 43, Number 6 (2015), 2859-2948.

Dates
Revised: May 2014
First available in Project Euclid: 11 December 2015

https://projecteuclid.org/euclid.aop/1449843623

Digital Object Identifier
doi:10.1214/14-AOP948

Mathematical Reviews number (MathSciNet)
MR3433574

Zentralblatt MATH identifier
1344.60098

#### Citation

Baur, Erich; Bolthausen, Erwin. Exit laws from large balls of (an)isotropic random walks in random environment. Ann. Probab. 43 (2015), no. 6, 2859--2948. doi:10.1214/14-AOP948. https://projecteuclid.org/euclid.aop/1449843623

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