Random Walks on Small World Networks

Random Walks on Small World Networks
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小世界网络上的随机游走

DOI:
10.1145/3382208
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发表时间:
2020
影响因子:
1.3
通讯作者:
Dyer M
Dyer M
中科院分区:
计算机科学3区
文献类型:
--
作者:
Dyer M

文献摘要

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本文研究了小世界网络上随机游动的混合时间:从二维周期网格开始,每对距离d> 1的顶点{u,v}被添加为概率与d-r成正比的“长程”边,其中r≥ 0是模型的一个参数。Kleinberg [33]{研究了这个网络模型的一个近似变体,并证明了当r =2时(分散)路由时间为O((logn)2),当r = 2时为nΩ(1)。在这里,我们证明了随机游动也经历了atr=2的相变,但在这种情况下,相变是不同的形式。我们建立了r< 2时混合时间为n Ω(logn),r =2时为O((logn)4),r> 2时为n Ω(1).
We study the mixing time of random walks on small-world networks modelled as follows: starting with the 2-dimensional periodic grid, each pair of vertices {u,v} with distance d> 1 is added as a “long-range” edge with probability proportional to d-r, where r≥ 0 is a parameter of the model. Kleinberg [33{ studied a close variant of this network model and proved that the (decentralised) routing time is O((logn)2) whenr=2 and nΩ (1)when r≠ 2. Here, we prove that the random walk also undergoes a phase transition atr=2, but in this case, the phase transition is of a different form. We establish that the mixing time is ϴ (log n) for r< 2, O((logn)4) forr=2, andnΩ (1)for r> 2.