The Divisible Sandpile at Critical Density

The Divisible Sandpile at Critical Density
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临界密度下的可分沙堆

DOI:
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发表时间:
2015
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通讯作者:
B. Ugurcan
B. Ugurcan
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作者:
Lionel Levine;M. Murugan;Y. Peres;B. Ugurcan

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可分沙堆从I.I.D.开始。在一个无限的顶点传递图的顶点上随机变量(“质量”),并通过局部倾倒规则重新分配质量,试图使所有质量≤为1。如果m为1,则该过程几乎肯定是稳定的,当m为1时,它几乎肯定不稳定,其中m是每个顶点的平均质量。本文的主要结果是,在临界情况下,如果初始质量具有有限的方差,则该过程几乎肯定不稳定。为了给出有限图上的定量估计,我们将浇注的数量与离散的双拉普拉斯高斯场联系起来。
The divisible sandpile starts with i.i.d. random variables (“masses”) at the vertices of an infinite, vertex-transitive graph, and redistributes mass by a local toppling rule in an attempt to make all masses ≤  1. The process stabilizes almost surely if m < 1 and it almost surely does not stabilize if m > 1, where m is the mean mass per vertex. The main result of this paper is that in the critical case m = 1, if the initial masses have finite variance, then the process almost surely does not stabilize. To give quantitative estimates on a finite graph, we relate the number of topplings to a discrete bi-Laplacian Gaussian field.