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arXiv 2002.09999math.PR
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具有优先连接结构的增长随机图

Growing random graphs with a preferential attachment structure

Delphin Sénizergues

摘要:

本文的目的是发展一种方法来证明一类增长随机图模型在Gromov-Hausodorff-Prokhorov拓扑中的几乎必然收敛,推广了Rémy的二叉树算法。我们描述了使用一些迭代胶合建设,推广著名的Aldous的布朗树的线断裂建设所获得的限制。为了做到这一点,我们开发了一个框架,在这个框架中,度量空间是通过沿着(可能是无限的)离散树的结构粘合较小的度量空间(称为\emph{blocks})来构建的。我们的增长随机图视为度量空间可以在这个框架中理解,即,作为发展块粘在一个不断增长的离散树结构。通过分别证明每个块的几乎必然收敛和整个结构的相对紧性,得到了它们的标度极限收敛性.对于我们研究的特定模型,构造背后的离散树结构具有仿射优先连接树或加权递归树的分布。我们强烈依赖的结果,这两个模型的随机树和它们的连接,在一个配套文件中获得。

英文摘要:

The aim of this paper is to develop a method for proving almost sure convergence in Gromov-Hausodorff-Prokhorov topology for a class of models of growing random graphs that generalises Rémy's algorithm for binary trees. We describe the obtained limits using some iterative gluing construction that generalises the famous line-breaking construction of Aldous' Brownian tree. In order to do that, we develop a framework in which a metric space is constructed by gluing smaller metric spaces, called \emph{blocks}, along the structure of a (possibly infinite) discrete tree. Our growing random graphs seen as metric spaces can be understood in this framework, that is, as evolving blocks glued along a growing discrete tree structure. Their scaling limit convergence can then be obtained by separately proving the almost sure convergence of every block and verifying some relative compactness property for the whole structure. For the particular models that we study, the discrete tree structure behind the construction has the distribution of an affine preferential attachment tree or a weighted recursive tree. We strongly rely on results concerning those two models of random trees and their connection, obtained in a companion paper.

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