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Recurrence of Simple Random Walk on $Z^2$ is Dynamically Sensitive
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Benjamini, Haggstrom, Peres and Steif introduced the concept of a dynamical random walk. This is a continuous family of random walks, {S_n(t)}. Benjamini et. al. proved that if d=3 or d=4 then there is an exceptional set of t such that {S_n(t)} returns to the origin infinitely often. In this paper we consider a dynamical random walk on Z^2. We show that with probability one there exists t such that {S_n(t)} never returns to the origin. This exceptional set of times has dimension one. This proves a conjecture of Benjamini et. al.
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Noise sensitivity and exceptional times of transience for a simple symmetric random walk in one dimension
For the switch random walk, exceptional times of transience exist almost surely, the exceptional set has Hausdorff dimension 1/2, and the positivity event is maximally noise sensitive.
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