Mathematics – Probability
Scientific paper
2011-12-14
Mathematics
Probability
Scientific paper
The dynamical discrete web is a system of one-dimensional coalescing random walks that evolves in an extra dynamical time parameter. At any deterministic dynamical time, the paths behave as coalescing simple symmetric random walks. This paper studies the existence of (random) exceptional dynamical times at which the paths violate certain almost sure properties of random walks. It was shown in 2009 by Fontes, Newman, Ravishankar and Schertzer that there exist exceptional times at which the path starting from the origin violates the law of the iterated logarithm. Their results gave exceptional times at which the path is slightly subdiffusive in one direction. This paper extends this to obtain times at which the path is slightly subdiffusive in both directions. We then obtain upper and lower bounds for the Hausdorff dimensions of this set, and related sets, of exceptional times.
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