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arXiv math/0701698math.PR
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空间传染病:一维的临界行为

Spatial Epidemics: Critical Behavior in One Dimension

Steven P. Lalley

摘要:

在简单平均场SIS和SIR传染病模型中,传染病通过独立的p-硬币投掷从有限总体的感染者传递到易感者。这些模型的空间变量,其中有限总体的大小N是位于一个晶格的网站和传染性接触仅限于个人在相邻的网站。这些模型的比例律的感染参数p是这样的流行病是临界的。它表明,在所有情况下,有一个临界阈值的数量最初感染:低于阈值,流行病的演变基本上是相同的方式,其分支信封,但在阈值演变像一个分支过程与大小依赖漂移。相应的标度极限分别为超布朗运动和带killing的Dawson-Watanabe过程。

英文摘要:

In the simple mean-field SIS and SIR epidemic models, infection is transmitted from infectious to susceptible members of a finite population by independent p-coin tosses. Spatial variants of these models are proposed, in which finite populations of size N are situated at the sites of a lattice and infectious contacts are limited to individuals at neighboring sites. Scaling laws for these models are given when the infection parameter p is such that the epidemics are critical. It is shown that in all cases there is a critical threshold for the numbers initially infected: below the threshold, the epidemic evolves in essentially the same manner as its branching envelope, but at the threshold evolves like a branching process with a size-dependent drift. The corresponding scaling limits are super-Brownian motions and Dawson-Watanabe processes with killing, respectively.

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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