Mathematics – Dynamical Systems
Scientific paper
2011-10-31
Mathematics
Dynamical Systems
25 pages
Scientific paper
We present recent results about the asymptotic behavior of ergodic products of isometries of a metric space X. If we assume that the displacement is integrable, then either there is a sublinear diffusion or there is, for almost every trajectory in X, a preferred direction at the boundary. We discuss the precise statement when X is a proper metric space and compare it with classical ergodic theorems. Applications are given to ergodic theorems for nonintegrable functions, random walks on groups and Brownian motion on covering manifolds.
Karlsson Anders
Ledrappier Francois
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