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arXiv 0812.2248math.PRnlin.CD
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一类空间传染病模型的混沌

Chaos in a spatial epidemic model

Rick Durrett, Daniel Remenik

摘要:

我们研究了一个相互作用的粒子系统的灵感来自舞毒蛾,其人口增长,直到他们变得足够密集,使流行病减少到一个低水平。我们考虑这个过程的随机3-正则图和$d$ -维格和环面,与$d\geq2$。在具有全局扩散或扩散半径随站点数增长的有限图上,我们证明了对于某些参数值收敛到一个混沌的动力系统。我们猜想,在一个固定的有限扩散距离的无限晶格,遥远的部分晶格振荡的相位,所以有一个独特的非平凡的平稳分布。

英文摘要:

We investigate an interacting particle system inspired by the gypsy moth, whose populations grow until they become sufficiently dense so that an epidemic reduces them to a low level. We consider this process on a random 3-regular graph and on the $d$-dimensional lattice and torus, with $d\geq2$. On the finite graphs with global dispersal or with a dispersal radius that grows with the number of sites, we prove convergence to a dynamical system that is chaotic for some parameter values. We conjecture that on the infinite lattice with a fixed finite dispersal distance, distant parts of the lattice oscillate out of phase so there is a unique nontrivial stationary distribution.

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