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Random Walks in Dirichlet Random Environments on $\mathbb...
Daniel J. Slonim · 2021-04-30 · via math.PR updates on arXiv.org

We examine a class of random walks in random environments on $\mathbb{Z}$ with bounded jumps, a generalization of the classic one-dimensional model. The environments we study have i.i.d. transition probability vectors drawn from Dirichlet distributions. For this model, we characterize recurrence and transience, and in the transient case we characterize ballisticity. For ballisticity, we give two parameters, $κ_0$ and $κ_1$. The parameter $κ_0$ governs finite trapping effects, and $κ_1$ governs repeated traversals of arbitrarily large regions of the graph. We show that the walk is right-transient if and only if $κ_1>0$, and in that case it is ballistic if and only if $\min(κ_0,κ_1)>1$.