The Divisible Sandpile at Critical Density
The Divisible Sandpile at Critical Density
复制标题
临界密度下的可分沙堆
DOI:
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发表时间:
2015
期刊:
影响因子:
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通讯作者:
B. Ugurcan
中科院分区:
文献类型:
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作者:
Lionel Levine;M. Murugan;Y. Peres;B. Ugurcan
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.