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arXiv 1206.6575math.AP
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反应扩散方程的环境引导波前

Traveling fronts guided by the environment for reaction-diffusion equations

Henri Berestycki, Guillemette Chapuisat

摘要:

研究了一类KPP反应扩散方程在介质引导下的波前解的存在性,该方程来自于一个种群动力学模型,其中一个数量遗传性状具有局部偏好值,且具有空间扩散和遗传突变.我们的目标是了解在这种异质背景下的传播和入侵。我们证明了一个门限值的存在性的非零渐近配置文件(一个固定的限制解决方案)。当非零渐近轮廓存在时,我们证明了旅行前的存在性。这使我们能够完全识别KPP情况下抛物问题的解的行为。我们在这里也研究了一个例子。该方程为大脑皮层扩散性抑制模型提供了一个一般框架。我们证明了当反应区足够大时存在行波波前,当反应区太小时不存在行波波前。

英文摘要:

This paper deals with the existence of traveling fronts guided by the medium for a KPP reaction-diffusion equation coming from a model in population dynamics in which there is spatial spreading as well as genetic mutation of a quantitative genetic trait that has a locally preferred value. The goal is to understand spreading and invasions in this heterogeneous context. We prove the existence of a threshold value on the existence of a nonzero asymptotic profile (a stationary limiting solution). When a nonzero asymptotic profile exists, we prove the existence of a traveling front. This allows us to completely identify the behavior of the solution of the parabolic problem in the KPP case. We also study here the bistable case. The equation provides a general framework for a model of cortical spreading depressions in the brain. We prove the existence of traveling front if the area where theere is reaction is large enough and the non-existence if it is too small.

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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