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arXiv 1012.2392math.AP
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Fisher-KPP跃迁锋的存在性和不存在性

Existence and Non-existence of Fisher-KPP Transition Fronts

James Nolen, Jean-Michel Roquejoffre, Lenya Ryzhik, Andrej Zlatos

摘要:

考虑具有空间非齐次反应速率的Fisher-KPP型反应扩散方程.我们发现,一个足够强的本地化的不均匀性可能会阻止存在的过渡前型全球的时间解决方案,同时创建一个全球的时间凹凸解决方案。这是第一个不存在反应扩散过渡前沿的介质的例子。一个较弱的局部不均匀性导致存在的过渡前,但只有在有限的速度范围内。这些结果与均相介质中的Fisher-KPP反应以及非均相介质中的点燃型反应形成对比。

英文摘要:

We consider Fisher-KPP-type reaction-diffusion equations with spatially inhomogeneous reaction rates. We show that a sufficiently strong localized inhomogeneity may prevent existence of transition-front-type global in time solutions while creating a global in time bump-like solution. This is the first example of a medium in which no reaction-diffusion transition front exists. A weaker localized inhomogeneity leads to existence of transition fronts but only in a finite range of speeds. These results are in contrast with both Fisher-KPP reactions in homogeneous media as well as ignition-type reactions in inhomogeneous media.

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