Singular solutions of some nonlinear parabolic equations with spatially inhomogeneous absorption
Singular solutions of some nonlinear parabolic equations with spatially inhomogeneous absorption
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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
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发表时间:
2007
影响因子:
2.1
通讯作者:
L. Véron
中科院分区:
文献类型:
--
作者:
A. Shishkov;L. Véron
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).