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arXiv 0711.4871math.PR
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Z上的一个漂移由零处的占有时间驱动的随机游动

A random walk on Z with drift driven by its occupation time at zero

Iddo Ben-Ari, Mathieu Merle, Alexander Roitershtein

摘要:

考虑一维整数格点上最近邻随机游动,其向原点的漂移由到零的访问次数的渐近消失函数决定。我们表明存在不同的制度,根据衰减的漂移率。特别地,当速率足够慢时,适当归一化的随机游动的位置收敛到对称的指数律。在这种情况下,与经典情况相反,行走的范围与其位置不同。

英文摘要:

We consider a nearest neighbor random walk on the one-dimensional integer lattice with drift towards the origin determined by an asymptotically vanishing function of the number of visits to zero. We show the existence of distinct regimes according to the rate of decay of the drift. In particular, when the rate is sufficiently slow, the position of the random walk, properly normalized, converges to a symmetric exponential law. In this regime, in contrast to the classical case, the range of the walk scales differently from its position.

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