Ornstein-Uhlenbeck process in a random potential. (English) Zbl 0617.60078

Let \(X_ t\) be an Ornstein-Uhlenbeck process in \({\mathbb{R}}^ d\times {\mathbb{R}}^ d\) with random infinitesimal generator of the form \[ \sum^{d}_{i=1}[\frac{\partial^ 2}{\partial v^ 2_ i}-v_ i\frac{\partial}{\partial v_ i}+q_ i(x)\frac{\partial}{\partial v_ i}+v_ i\frac{\partial}{\partial x_ i}] \] where \(q_ i\) are suitably random. Suppose X starts at 0 with initial velocity distribution \((2\pi)^{-d/2}\exp (2^{-1}| v|^ 2)dv\). Then the scaled process \(\epsilon X(t\epsilon^{-2})\) behaves, for small \(\epsilon\), like a d-dimensional Brownian motion with some non-singular matrix.
Reviewer: M.Rao


60J65 Brownian motion
60G15 Gaussian processes
Full Text: DOI


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