Convergence to a single wave in the Fisher-KPP equation

Convergence to a single wave in the Fisher-KPP equation
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Fisher-KPP 方程收敛为单波

DOI:
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发表时间:
2016
期刊:
影响因子:
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通讯作者:
L. Ryzhik
L. Ryzhik
中科院分区:
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文献类型:
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作者:
J. Nolen;J. Roquejoffre;L. Ryzhik

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研究了Fisher-KPP反应扩散方程的解的大时间渐近性,初始条件为阶跃函数的紧摄动。Bramson的一个著名结果指出,在以2t−(3/2)logt+x∞运动的参考系中,方程的解收敛为t→+∞到对应于最小速度c*=2的行波的平移。常数x∞取决于初始条件u(0,x)。这一证明是详尽的,而且是基于概率论证。本文的目的是提供一种基于偏微分方程论的简单证明。
The authors study the large time asymptotics of a solution of the Fisher-KPP reaction-diffusion equation, with an initial condition that is a compact perturbation of a step function. A well-known result of Bramson states that, in the reference frame moving as 2t−(3/2)log t+x∞, the solution of the equation converges as t → +∞ to a translate of the traveling wave corresponding to the minimal speed c* = 2. The constant x∞ depends on the initial condition u(0, x). The proof is elaborate, and based on probabilistic arguments. The purpose of this paper is to provide a simple proof based on PDE arguments.
DOI: 10.1007/s00440-012-0464-x
发表时间: 2011-03
影响因子: 2
作者:
L. Arguin;Anton Bovier;N. Kistler
通讯作者: L. Arguin;Anton Bovier;N. Kistler