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arXiv 2201.07270math.PRcond-mat.stat-mechmath-phmath.MP
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Beta分布随机环境中非负整数上的随机游动

Random walk on nonnegative integers in beta distributed random environment

Guillaume Barraquand, Mark Rychnovsky

摘要:

考虑了空间-不定常随机环境中非负整数上的随机游动.我们假设转移概率由独立的$\mathrm{Beta}(μ,μ)$分布随机变量给出,在边界处具有特定的行为,由额外的参数$η$控制。我们证明了这个模型是完全可解的,并证明了随机热核的混合矩的一个公式。然后,我们提供了两个公式,使我们能够研究大尺度的行为。第一个涉及到Fredholm Pfwestan,我们用它来证明一个局部极限定理,描述边界参数$η$如何影响回报概率。第二个是一个明确的一系列的积分,我们表明,非严格的临界点渐近性表明,这个半空间的随机游动在随机环境中的大偏差行为是相同的类似随机游动$\mathbb{Z}$。

英文摘要:

We consider random walks on the nonnegative integers in a space-time dependent random environment. We assume that transition probabilities are given by independent $\mathrm{Beta}(μ,μ)$ distributed random variables, with a specific behaviour at the boundary, controlled by an extra parameter $η$. We show that this model is exactly solvable and prove a formula for the mixed moments of the random heat kernel. We then provide two formulas that allow us to study the large-scale behaviour. The first involves a Fredholm Pfaffian, which we use to prove a local limit theorem describing how the boundary parameter $η$ affects the return probabilities. The second is an explicit series of integrals, and we show that non-rigorous critical point asymptotics suggest that the large deviation behaviour of this half-space random walk in random environment is the same as for the analogous random walk on $\mathbb{Z}$.

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