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arXiv 2102.01408math.PR
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无矩条件下双曲空间上随机游动的指数界

Exponential bounds for random walks on hyperbolic spaces without moment conditions

Sébastien Gouëzel

摘要:

考虑一般双曲空间上的非初等随机游动。没有任何时刻条件的步行,我们表明,它逃脱线性无穷大,指数误差界。我们甚至可以得到这样的指数界,直到行走的逃逸率。我们的证明依赖于行走的归纳分解,记录它可以在几个独立方向上走向无穷大的时间,并使用这些时间来控制进一步的回溯。

英文摘要:

We consider nonelementary random walks on general hyperbolic spaces. Without any moment condition on the walk, we show that it escapes linearly to infinity, with exponential error bounds. We even get such exponential bounds up to the rate of escape of the walk. Our proof relies on an inductive decomposition of the walk, recording times at which it could go to infinity in several independent directions, and using these times to control further backtracking.

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