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arXiv 0905.2310math.PR
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在选举模型中从四个到两个意见块的通过时间和在四分之一平面中的行走时间

Passage time from four to two blocks of opinions in the voter model and walks in the quarter plane

Irina Kurkova, Kilian Raschel

摘要:

考虑$Z_+^2$中的随机游走,其内部空间均匀,在轴处吸收,从任意点$(i_0,j_0)$开始,并具有图1中绘制的步长概率。明确了随机游走在给定时间到达给定点$(i,j)\in Z_+^2$的概率的三元母函数$k\geq 0$。在给定的时间$k$和在一个给定的轴的吸收概率被发现,其精确的渐近推导出的时间$k\to\infty$。等价的两种典型的方式的条件,这种随机游动永远不会达到轴的建立。结果也适用于分析的选举模型与两个候选人,最初,在人口$Z$,四个连接块相同的意见。然后,一个公民改变主意的速度与不同意他的邻居的数量成正比。也就是说,从四块到两块意见的通道进行了研究。

英文摘要:

A random walk in $Z_+^2$ spatially homogeneous in the interior, absorbed at the axes, starting from an arbitrary point $(i_0,j_0)$ and with step probabilities drawn on Figure 1 is considered. The trivariate generating function of probabilities that the random walk hits a given point $(i,j)\in Z_+^2$ at a given time $k\geq 0$ is made explicit. Probabilities of absorption at a given time $k$ and at a given axis are found, and their precise asymptotic is derived as the time $k\to\infty$. The equivalence of two typical ways of conditioning this random walk to never reach the axes is established. The results are also applied to the analysis of the voter model with two candidates and initially, in the population $Z$, four connected blocks of same opinions. Then, a citizen changes his mind at a rate proportional to the number of its neighbors that disagree with him. Namely, the passage from four to two blocks of opinions is studied.

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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