arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.14760math.AP
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周期介质中具有快速扩散线的Fisher-KPP模型

A Fisher-KPP model with a fast diffusion line in periodic media

Elisa Affili

摘要:

本文讨论了一个周期环境中的种群动力学模型,该模型具有快速扩散线。这种现象是通过一个“路场”系统,这是一个系统的耦合反应扩散方程设置在不同的维度域建模。在这里,我们考虑的情况下,第一次的反应项依赖于一个空间变量的周期性的方式,这是非常感兴趣的数学困难和它的应用。我们得到的物种生存的充要条件中的一个合适的广义主特征值的符号。此外,我们比较了在相同环境中没有快速扩散线的种群的长期行为,发现该元素对生存机会没有影响。

英文摘要:

We treat a model of population dynamics in a periodic environment presenting a fast diffusion line. This phenomenon is modelled via a "road-field" system, which is a system of coupled reaction-diffusion equations set in domains of different dimensions. Here, we consider for the first time the case of a reaction term depending on a spatial variable in a periodic fashion, which is of great interest for both its mathematical difficulties and for its applications. We derive necessary and sufficient conditions for the survival of the species in terms of the sign of a suitable generalised principal eigenvalue. Moreover, we compare the long time behaviour of a population in the same environment without the fast diffusion line, finding that this element has no impact on the survival chances.

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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