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arXiv 1609.05974math.PR
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完全图上具有随机转移率的SIR模型的相变

Phase transition for the SIR model with random transition rates on complete graphs

Xiaofeng Xue

摘要:

本文研究了具有$n$顶点的完全图$C_n$上具有随机转移率的易感-传染-消除模型.我们分配i。I. D.每个顶点上的正随机变量$ξ$的副本作为恢复率,i. I. d个正随机变量$ρ$的拷贝作为边感染权重。我们假设一个易感染的顶点是由一个感染率成正比的连接这两个顶点的边的边的权重,而一个感染的顶点成为删除率等于恢复率,然后我们表明,该模型进行以下相变时,在$t=0$的一个顶点是感染性的,其他的是易感染的。当$λ<λ_c$时,曾经感染过的顶点的比例弱收敛到$0$,如$n\rightarrow+\infty$,而当$λ>λ_c$时,存在$c(λ)>0$和$b(λ)>0$,使得对于概率至少为$b(λ)$的每个$n\geq 1$,曾经感染过的顶点的比例至少为$c(λ)$。进一步证明了$λ_c$是$ρ$的平均值的乘积的逆和$ξ$的逆的平均值。

英文摘要:

In this paper we are concerned with the Susceptible-Infective-Removed model with random transition rates on complete graphs $C_n$ with $n$ vertices. We assign i. i. d. copies of a positive random variable $ξ$ on each vertex as the recovery rates and i. i. d copies of a positive random variable $ρ$ on each edge as the edge infection weights. We assume that a susceptible vertex is infected by an infective one at rate proportional to the edge weight on the edge connecting these two vertices while an infective vertex becomes removed with rate equals the recovery rate on it, then we show that the model performs the following phase transition when at $t=0$ one vertex is infective and others are susceptible. When $λ<λ_c$, the proportion of vertices which have ever been infective converges to $0$ weakly as $n\rightarrow+\infty$ while when $λ>λ_c$, there exist $c(λ)>0$ and $b(λ)>0$ such that for each $n\geq 1$ with probability at least $b(λ)$ the proportion of vertices which have ever been infective is at least $c(λ)$. Furthermore, we prove that $λ_c$ is the inverse of the production of the mean of $ρ$ and the mean of the inverse of $ξ$.

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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