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arXiv 1909.01972math.PR
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正则图II上高斯自由场的水平集渗透:有限扩张子

Level-set percolation of the Gaussian free field on regular graphs II: Finite expanders

Angelo Abächerli, Jiří Černý

摘要:

本文研究一类固定$d\geq 3$的有限$d$ -正则图上的零平均高斯自由场。这类图包括$d$ -大围长正则扩张器和随机$d$ -正则图的典型实现。我们证明了零平均高斯自由场在$h$能级以上的能级集在$h_\star$能级发生相变,这与高斯自由场在无限$d$正则树上的能级集渗流的临界值一致.更准确地说,我们表明,概率趋于1的大小有限图趋于无穷大,水平集以上的水平$h$不包含任何连通组件大于对数大小时,$h>h_\star$,相反,每当$h<h_\star$,顶点的线性分数包含在水平集的高于水平$h$的连通分量中,其具有至少小分数的大小图的总尺寸的幂。它仍然开放是否在超临界阶段$h<h_\star$,作为图的大小趋于无穷大,人们观察到一个(潜在的唯一)巨大的连通组件的水平以上的水平集$h$的出现。本文中的证明利用了随附论文[AC 1]中的结果。

英文摘要:

We consider the zero-average Gaussian free field on a certain class of finite $d$-regular graphs for fixed $d\geq 3$. This class includes $d$-regular expanders of large girth and typical realisations of random $d$-regular graphs. We show that the level set of the zero-average Gaussian free field above level $h$ exhibits a phase transition at level $h_\star$, which agrees with the critical value for level-set percolation of the Gaussian free field on the infinite $d$-regular tree. More precisely, we show that, with probability tending to one as the size of the finite graphs tends to infinity, the level set above level $h$ does not contain any connected component of larger than logarithmic size whenever $h>h_\star$, and on the contrary, whenever $h<h_\star$, a linear fraction of the vertices is contained in connected components of the level set above level $h$ having a size of at least a small fractional power of the total size of the graph. It remains open whether in the supercritical phase $h<h_\star$, as the size of the graphs tends to infinity, one observes the emergence of a (potentially unique) giant connected component of the level set above level $h$. The proofs in this article make use of results from the accompanying paper [AC1].

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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