Stability of travelling waves for degenerate reaction-diffusion equations of KPP-type

Stability of travelling waves for degenerate reaction-diffusion equations of KPP-type
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KPP型简并反应扩散方程的行波稳定性

DOI:
10.1515/ans-2002-0402
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发表时间:
2002
影响因子:
1.8
通讯作者:
Z. Biró
Z. Biró
中科院分区:
数学3区
文献类型:
--
作者:
Z. Biró

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摘要研究一类非线性退化kpp型扩散反应方程ut = (um)xx + up - uq,其中m、p、q为正参数的Cauchy问题解在t→∞时的渐近性。我们的结果与Kolmogorov, Petrowsky和Piscunov的相应结果相似;即,我们证明了对于一类广泛的初值函数,解在x上t→∞时一致逼近V(x - c*t),其中V是一个最小速度为c*的行波解。
Abstract The aim of this paper is to investigate the asymptotic behaviour as t → ∞ of the solutions to the Cauchy problem for the nonlinear degenerate KPP-type diffusion-reaction equation ut = (um)xx + up - uq, where m,p and q are positive parameters. Our result is similar to the corresponding one of Kolmogorov, Petrowsky and Piscunov; namely, we prove that for a wide class of initial functions, the solution approaches V(x - c*t) as t → ∞ uniformly in x, where V is a travelling-wave solution with a minimal speed c*.