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On the distribution of random walk hitting times in random trees

机译:在随机树中随机散步的分布

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The hitting time H_(xy) between two vertices x and y of a graph is the average time that the standard simple random walk takes to get from x to y. In this paper, we study the distribution of the hitting time between two randomly chosen vertices of a random tree. We consider both uniformly random labelled trees and a more general model with vertex weights akin to simply generated trees. We show that the r-th moment of the hitting time is of asymptotic order n~(3r/2) in trees of order n, and we describe the limiting distribution upon normalisation by means of its moments. Moreover, we also obtain joint moments with the distance between the two selected vertices. Finally, we discuss a somewhat different model of randomness, namely random recursive trees. In this setup, the root is of special importance, and so we study the hitting time from the root to a random vertex or from a random vertex to the root. Interestingly, the hitting time from the root is of order n log n, with a normal limit law, while the hitting time to the root is only of linear order and has a non-Gaussian limit law.
机译:两个顶点x和y之间的击球时间h_(xy)是图形的平均时间,标准简单随机步行从x到y。在本文中,我们研究了随机树的两个随机选择顶点之间的击中时间的分布。我们考虑均匀随机标记的树木和具有顶点权重的更常规模型类似于简单地生成的树木。我们表明,击中时间的第一个时刻是订单N的树木中的渐近顺序n〜(3r / 2),我们通过瞬间描述了在标准化时的限制分布。此外,我们还获得了两个选定顶点之间的距离的关节矩。最后,我们讨论了一种不同的随机性模型,即随机递归树。在此设置中,根具有特殊重要性,因此我们将击中时间从根到随机顶点或从根目录的随机顶点进行研究。有趣的是,从根源的击中时间是命令n log n,具有正常的限制法,而击球时间仅为线性顺序,并且具有非高斯限制法。

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