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arXiv 0810.0654math.AP
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带源项的p-Laplace heat equation:自相似解的再认识

The p-Laplace heat equation with a source term : self-similar solutions revisited

Marie-Françoise Bidaut-Véron

摘要:

本文研究了方程u_{t} -div的任意符号的自相似解(|&#8711;u| ^{p-2}&#8711; u)= |u| ^{q-1}u,在R^{N}中,其中p,q>1。我们将Haraux-Weissler在p=2时得到的结果推广到q>p-1>0的情形。特别是我们研究的存在性缓慢或快速衰减的解决方案。对于给定的t>0,快速解u(t,.)当p>2时,在R^{N}中有紧支集,当p<2时,|x| ^{p/(2-p)}u(t,x)在无穷远处有界。我们描述了所有解决方案的大|x|的行为。根据q相对于第一临界指数p-1+p/N和临界Sobolev指数q^{ }的位置,研究了u(t,.)的正解的存在性或零点个数.证明了任意解u(t,.)当p<2且q接近于1时是振荡的。

英文摘要:

We study the self-similar solutions of any sign of the equation u_{t}-div(|&#8711;u|^{p-2}&#8711;u)=|u|^{q-1}u, in R^{N}, where p,q>1. We extend the results of Haraux-Weissler obtained for p=2 to the case q>p-1>0. In particular we study the existence of slow or fast decaying solutions. For given t>0, the fast solutions u(t,.) have a compact support in R^{N} when p>2, and |x|^{p/(2-p)}u(t,x) is bounded at infinity when p<2. We describe the behaviour for large |x| of all the solutions. According to the position of q with respect to the first critical exponent p-1+p/N and the critical Sobolev exponent q^{&#8727;}, we study the existence of positive solutions, or the number of the zeros of u(t,.). We prove that any solution u(t,.) is oscillatory when p<2 and q is closed to 1.

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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