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arXiv 1012.3386math.PR
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关于平移不变渗流中有偏随机游动的速度

On the speed of biased random walk in translation invariant percolation

Maria Deijfen, Olle Häggström

摘要:

对于超临界i.i.d.中无限团簇上的有偏随机游动,在$\Z^2$上的渗流,其中行走的偏差由参数$β>1$量化,已经证实(并且部分证明)存在临界值$β_c>1$,使得当$β<β_c$时行走具有正速度,并且当$β>β_c$时行走具有零速度。本文研究了$\Z^2$上某个平移不变渗流过程在无限簇上的有偏随机游动。该示例显示出与i.i.d.预期相反的行为。在这个意义上,它具有临界值$β_c$,使得对于$β<β_c$,随机游动的速度为零,而对于$β>β_c$,速度为正。因此,$β$的单调性是i.i.d.猜想的一部分。渗流不能扩展到一般的平移不变渗流过程。

英文摘要:

For biased random walk on the infinite cluster in supercritical i.i.d.\ percolation on $\Z^2$, where the bias of the walk is quantified by a parameter $β>1$, it has been conjectured (and partly proved) that there exists a critical value $β_c>1$ such that the walk has positive speed when $β<β_c$ and speed zero when $β>β_c$. In this paper, biased random walk on the infinite cluster of a certain translation invariant percolation process on $\Z^2$ is considered. The example is shown to exhibit the opposite behavior to what is expected for i.i.d.\ percolation, in the sense that it has a critical value $β_c$ such that, for $β<β_c$, the random walk has speed zero, while, for $β>β_c$, the speed is positive. Hence the monotonicity in $β$ that is part of the conjecture for i.i.d.\ percolation cannot be extended to general translation invariant percolation processes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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