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arXiv 1905.08481math.PR
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基于位置选择的优先连接:非凝聚相中的度分布

Preferential attachment with location-based choice: Degree distribution in the noncondensation phase

Arne Grauer, Lukas Lüchtrath, Mark Yarrow

AI总结:

本文研究带位置选择的优先连接模型,提出刻画凝聚相变的函数,并用随机逼近证明非凝聚相的渐近度分布服从幂律。

摘要:

我们考虑由 Haslegrave、Jordan 和 Yarrow 引入的基于位置选择的优先连接模型,该模型是一个可能发生凝聚现象的模型 [Haslegrave et al. 2020]。在该模型中,每个顶点都带有一个独立且均匀抽取的位置。模型从一棵初始树开始,按离散时间演化。在每个时间步,通过按照与顶点度成比例的抽样概率、从图中有放回地选取 $r$ 个候选顶点,将一个新顶点加入树中。随后,新顶点依据一个与候选顶点位置排名相关的给定概率,连接到其中一个候选顶点。本文中,我们引入一个函数来描述凝聚可能发生时的相变。考虑非凝聚相,我们使用随机逼近方法,研究处于给定最大度的给定区间内顶点的(渐近)比例的界。我们利用这些界观察到由上述函数描述的渐近度分布的幂律。因此,该函数完整刻画了我们感兴趣的性质。在凝聚相与非凝聚相之间的相变处,幂律指数取临界值一。

英文摘要:

We consider the preferential attachment model with location-based choice introduced by Haslegrave, Jordan and Yarrow as a model in which condensation phenomena can occur [Haslegrave et al. 2020]. In this model every vertex carries an independent and uniformly drawn location. Starting from an initial tree the model evolves in discrete time. At every time step, a new vertex is added to the tree by selecting $r$ candidate vertices from the graph with replacement according to a sampling probability proportional to these vertices' degrees. The new vertex then connects to one of the candidates according to a given probability associated to the ranking of their locations. In this paper, we introduce a function that describes the phase transition when condensation can occur. Considering the noncondensation phase, we use stochastic approximation methods to investigate bounds for the (asymptotic) proportion of vertices inside a given interval of a given maximum degree. We use these bounds to observe a power law for the asymptotic degree distribution described by the aforementioned function. Hence, this function fully characterises the properties we are interested in. The power law exponent takes the critical value one at the phase transition between the condensation - noncondensation phase.

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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