One-dimensional diffusion in an asymmetric random environment

According to a theorem of S. Schumacher, for a diffusion X in an environment determined by a stable process that belongs to an appropriate class and has index a, it holds that X-t/(log t)(a) converges in distribution as t -> infinity to a random variable having an explicit description in terms of the environment. We compute the density of this random variable in the case the stable process is spectrally one-sided. This computation extends a result of H. Kesten and quantifies the bias that the asymmetry of the environment causes to the behavior of the diffusion. (c) 2006 Elsevier Masson SAS. All rights reserved.