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arXiv 1209.4339math.PRmath.CO
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初始集稠密的自举渗流的时间

The time of bootstrap percolation with dense initial sets for all thresholds

Béla Bollobás, Paul Smith, Andrew J. Uzzell

摘要:

本文研究了离散环面$(\Z/n\Z)^d$上$r$ -近邻自举渗流模型的渗流时间.对于$t$至多是$n$的一个多对数函数,且初始感染概率在一定范围内依赖于$t$,我们证明了当$n$趋于无穷大时,环面的一个随机子集的渗流时间以高概率恰好等于$t$.我们的证明关键在于三个新的极值定理,共同建立一个几乎完整的理解的几何行为的$r$邻居引导过程中的密集设置。我们结果的特例$d-r=0$最近被Bollobás,Holmgren,Smith和Uzzell证明.

英文摘要:

We study the percolation time of the $r$-neighbour bootstrap percolation model on the discrete torus $(\Z/n\Z)^d$. For $t$ at most a polylog function of $n$ and initial infection probabilities within certain ranges depending on $t$, we prove that the percolation time of a random subset of the torus is exactly equal to $t$ with high probability as $n$ tends to infinity. Our proof rests crucially on three new extremal theorems that together establish an almost complete understanding of the geometric behaviour of the $r$-neighbour bootstrap process in the dense setting. The special case $d-r=0$ of our result was proved recently by Bollobás, Holmgren, Smith and Uzzell.

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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