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arXiv 1012.2352math.PR
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具有给定度序列的临界随机图的分支数

The component sizes of a critical random graph with given degree sequence

Adrien Joseph

摘要:

考虑一个临界随机多重图$\mathcal{G}_n$,它的$n$的顶点是由配置模型构造的,使得它的顶点度是独立的随机变量,具有相同的分布$ν$(临界性意味着$ν$的二阶矩是有限的,并且等于它的一阶矩的两倍).我们指定的缩放限制的有序序列的组件大小的$\mathcal{G}_n$的$n$趋于无穷大,在不同的情况下。当$ν$有有限个三阶矩时,由$n^{-2/3}$重新标度的分量大小收敛到在过去极小值之上具有抛物线漂移的布朗运动的漂移长度,而当$ν$是指数为$γ\in(3,4)$的幂律分布时,由$n^{-(γ-2)/(γ-1)}$重新标度的分量大小收敛到在过去极小值之上具有独立增量独立增量过程的漂移长度.当$ν$有有限个三阶矩时,我们得到了临界随机单图的分支大小的渐近性质。

英文摘要:

Consider a critical random multigraph $\mathcal{G}_n$ with $n$ vertices constructed by the configuration model such that its vertex degrees are independent random variables with the same distribution $ν$ (criticality means that the second moment of $ν$ is finite and equals twice its first moment). We specify the scaling limits of the ordered sequence of component sizes of $\mathcal{G}_n$ as $n$ tends to infinity in different cases. When $ν$ has finite third moment, the components sizes rescaled by $n^{-2/3}$ converge to the excursion lengths of a Brownian motion with parabolic drift above past minima, whereas when $ν$ is a power law distribution with exponent $γ\in(3,4)$, the components sizes rescaled by $n^{-(γ-2)/(γ-1)}$ converge to the excursion lengths of a certain nontrivial drifted process with independent increments above past minima. We deduce the asymptotic behavior of the component sizes of a critical random simple graph when $ν$ has finite third moment.

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