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arXiv 1712.03334math.PRmath.CO
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非正则伪随机图上的站点渗流

Site percolation on non-regular pseudo-random graphs

Suman Chakraborty

摘要:

本文研究了图序列$\{G_n\}_{n\geq1}$在$n$顶点上的点渗透问题,其中每个顶点的度都在区间$(np -a_n, np+a_n)$内,且每对顶点的余度至多为${n}p^2+ b_n$,其中$p \in (0,1)$和$\{a_n\}_{n\geq1}$,$\{b_n\}_{n\geq1}$是实数序列.在适当的条件下,$p \in (0,1)$,$a_n$的和$b_n$的,我们表明,这些序列的图上的网站渗流在$\frac{1}{np}$进行急剧的相变。更精确地说,对于$\varepsilon>0$,我们通过以概率$ρ_n$独立地包括$G_n$的每个顶点来形成随机集$R(ρ_n)$。如果$ρ_n = \frac{1-\varepsilon}{np}$,则对每个足够小的$\varepsilon>0$和足够大的$n$,由$R(ρ_n)$诱导的$G_n$的子图中的所有连通分支在$n$中以高概率最多是多对数的.如果$ρ_n = \frac{1+\varepsilon}{np}$,则对于每个足够小的$\varepsilon>0$和足够大的$n$,由$R(ρ_n)$诱导的$G_n$的子图以高概率包含大小至少为$\frac{\varepsilon}{p}$的“巨”连通分支。此外,我们证明了在一个额外的假设下,$\{b_n\}_{n\geq 1}$的巨组件是唯一的。这部分地解决了Krivelevich \cite{krivelevich2016phase}重新分级的唯一性的巨人组成部分网站渗流在一般类的定期伪随机图的问题。我们希望我们证明巨连通分支唯一性的方法也适用于其他情况。

英文摘要:

We study site percolation on a sequence of graphs $\{G_n\}_{n\geq1}$ on $n$ vertices where degree of each vertex is in the interval $(np -a_n, np+a_n)$ and the co-degree of every pair of vertices is at most ${n}p^2+ b_n$, where $p \in (0,1)$ and $\{a_n\}_{n\geq1}$, $\{b_n\}_{n\geq1}$ are sequences of real numbers. Under suitable conditions on $p \in (0,1)$, $a_n$'s and $b_n$'s we show that site percolation on these sequences of graphs undergo a sharp phase transition at $\frac{1}{np}$. More precisely for $\varepsilon>0$, we form a random set $R(ρ_n)$ by including each vertex of $G_n$ independently with probability $ρ_n$. If $ρ_n = \frac{1-\varepsilon}{np}$, then for every small enough $\varepsilon>0$ and $n$ large enough, all connected components in the subgraph of $G_n$ induced by $R(ρ_n)$ are of size at most poly-logarithmic in $n$ with high probability. If $ρ_n = \frac{1+\varepsilon}{np}$, then for every small enough $\varepsilon>0$ and $n$ large enough, the subgraph of $G_n$ induced by $R(ρ_n)$ contains a 'giant' connected component of size at least $\frac{\varepsilon}{p}$ with high probability. Further, we show that under an additional assumption on $\{b_n\}_{n\geq 1}$ the giant component is unique. This partially resolves a question by Krivelevich \cite{krivelevich2016phase} regrading uniqueness of the giant component of site percolation in a general class of regular pseudo-random graphs. We hope that our method of proving uniqueness of the giant component will be applicable in other contexts as well.

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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