Singular solutions of some nonlinear parabolic equations with spatially inhomogeneous absorption

Singular solutions of some nonlinear parabolic equations with spatially inhomogeneous absorption
复制标题

一些具有空间非均匀吸收的非线性抛物型方程的奇异解

DOI:
10.1007/s00526-008-0165-6
复制
发表时间:
2007
影响因子:
2.1
通讯作者:
L. Véron
L. Véron
中科院分区:
数学2区
文献类型:
--
作者:
A. Shishkov;L. Véron

文献摘要

被引文献

相似文献

我们研究了$${\partial_t} u- \Delta u + h解的极限行为(|X|) |u| ^{p-1}u = 0,in\,{\mathbb{R}}^N \times(0,T)}$$当k → ∞时,初始数据k为δ 0,其中p为非减正函数且p> 1.如果h(r)=rβ,β>N(p− 1)− 2,我们证明了极限函数u ∞是显式非常奇异解,而当β≤N(p− 1)− 2时,这样的解不存在。当liminfr → 0 r2 ln(1/h(r))> 0时,u∞在(0,t)(t≥ 0)处存在持续奇点.如果u∞有一个局部于(0,0)的点态奇点.
We study the limit behaviour of solutions of $${{\partial_t} u- \Delta u + h(|x|) |u|^{p-1}u = 0\,in\,{\mathbb{R}}^N \times (0,T)}$$ with initial datakδ0whenk→ ∞, wherehis a positive nondecreasing function andp> 1. Ifh(r) =rβ,β>N(p− 1) − 2, we prove that the limit functionu∞is an explicit very singular solution, while such a solution does not exist ifβ≤N(p− 1) − 2. Ifliminfr→ 0r2ln (1/h(r))  >  0,u∞has a persistent singularity at (0,t) (t≥  0). If,u∞has a pointwise singularity localized at (0, 0).