Geodesics and Recurrence of Random Walks in Disordered Systems

Geodesics and Recurrence of Random Walks in Disordered Systems
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无序系统中随机游走的测地线和递归

DOI:
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发表时间:
2002
期刊:
影响因子:
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通讯作者:
Jean
Jean
中科院分区:
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文献类型:
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作者:
D. Boivin;Jean

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在正方形格子上的第一次通过渗流模型中,如果通过时间是独立的,那么测地线的数量要么是0,要么是+infty。如果通过时间是平稳的,遍历的,并且有一个有限阶矩,那么测地线的数目要么是0,要么是+infty。我们构建了一个具有固定通过时间的模型,使得$Elbrack t(e)^alpha brack < infty$,对于每个$0 < alpha < 1/2$,并且具有唯一的测地线。研究了具有平稳电导的随机环境$(a(e);e$是$mathbb{Z}^2)$中可逆随机游动的常返性和瞬态性.
In a first-passage percolation model on the square lattice $Z^2$, if the passage times are independent then the number of geodesics is either $0$ or $+infty$. If the passage times are stationary, ergodic and have a finite moment of order $alpha > 1/2$, then the number of geodesics is either $0$ or $+infty$. We construct a model with stationary passage times such that $Elbrack t(e)^alpha brack < infty$, for every $0 < alpha < 1/2$, and with a unique geodesic. The recurrence/transience properties of reversible random walks in a random environment with stationary conductances $( a(e);e$ is an edge of $mathbb{Z}^2)$ are considered.