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arXiv 0810.4683q-bio.PEcond-mat.stat-mechphysics.bio-ph
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一个简单传染病模型中的波动和振荡

Fluctuations and oscillations in a simple epidemic model

Ganna Rozhnova, Ana Nunes

摘要:

我们发现,最简单的随机流行病模型的空间相关性表现出两种类型的振荡行为在地方病阶段。在一个大的参数范围内,振荡是由于共振放大的随机波动,一般机制首次报道的捕食者-猎物动力学。在一个狭窄的参数范围内,包括许多传染病,赋予持久的免疫力的振荡持续无限的人口。这种效应在模拟可变大小系统中的随机过程时很明显,并且可以从确定性对近似方程的相图中理解。这两种机制结合在一起,在解释真实数据和流行病及其他相关模型的模拟结果中普遍存在的振荡行为方面发挥了核心作用。

英文摘要:

We show that the simplest stochastic epidemiological models with spatial correlations exhibit two types of oscillatory behaviour in the endemic phase. In a large parameter range, the oscillations are due to resonant amplification of stochastic fluctuations, a general mechanism first reported for predator-prey dynamics. In a narrow range of parameters that includes many infectious diseases which confer long lasting immunity the oscillations persist for infinite populations. This effect is apparent in simulations of the stochastic process in systems of variable size, and can be understood from the phase diagram of the deterministic pair approximation equations. The two mechanisms combined play a central role in explaining the ubiquity of oscillatory behaviour in real data and in simulation results of epidemic and other related models.

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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