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A Note on the Majority Dynamics in Inhomogeneous Random Graphs
Results in Mathematics ( IF 2.2 ) Pub Date : 2021-05-24 , DOI: 10.1007/s00025-021-01436-z
Yilun Shang

In this note, we study discrete time majority dynamics over an inhomogeneous random graph G obtained by including each edge e in the complete graph \(K_n\) independently with probability \(p_n(e)\). Each vertex is independently assigned an initial state \(+1\) (with probability \(p_+\)) or \(-1\) (with probability \(1-p_+\)), updated at each time step following the majority of its neighbors’ states. Under some regularity and density conditions of the edge probability sequence, if \(p_+\) is smaller than a threshold, then G will display a unanimous state \(-1\) asymptotically almost surely, meaning that the probability of reaching consensus tends to one as \(n\rightarrow \infty \). The consensus reaching process has a clear difference in terms of the initial state assignment probability: In a dense random graph \(p_+\) can be near a half, while in a sparse random graph \(p_+\) has to be vanishing. The size of a dynamic monopoly in G is also discussed.



中文翻译:

关于不均匀随机图的多数动力学的一个注记

在本注释中,我们研究了不均匀随机图G上的离散时间多数动力学,该随机图G是通过以概率\(p_n(e)\)独立地将每个边e包括在完整图\(K_n \)中而获得的。每个顶点被独立分配一个初始状态\(+ 1 \)(概率为\(p _ + \))或\(-1 \)(概率为((1-p _ + \))),并在随后的每个时间步进行更新邻国的大多数国家。在边缘概率序列的某些规律性和密度条件下,如果\(p _ + \)小于阈值,则G将显示一致状态\(-1 \)渐近地几乎可以肯定地表示,这意味着达成共识的可能性趋于为\(n \ rightarrow \ infty \)。就初始状态分配概率而言,共识达成过程存在明显差异:在密集的随机图中\(p _ + \)可能接近一半,而在稀疏的随机图中\(p _ + \)必须消失。还讨论了G中动态垄断的规模。

更新日期:2021-05-24
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