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arxiv: math/0412018 · v1 · submitted 2004-12-01 · 🧮 math.PR

Frequently visited sets for random walks

classification 🧮 math.PR
keywords finitelimitoccupationrandomsetstimebrownianconnection
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We study the occupation measure of various sets for a symmetric transient random walk in $Z^d$ with finite variances. Let $\mu^X_n(A)$ denote the occupation time of the set $A$ up to time $n$. It is shown that $\sup_{x\in Z^d}\mu_n^X(x+A)/\log n$ tends to a finite limit as $n\to\infty$. The limit is expressed in terms of the largest eigenvalue of a matrix involving the Green's function of $X$ restricted to the set $A$. Some examples are discussed and the connection to similar results for Brownian motion is given.

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