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arXiv 1706.01403math.AP
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具有正初值的非线性heat equation的变号自相似解

Sign-changing self-similar solutions of the nonlinear heat equation with positive initial value

Thierry Cazenave, Flávio Dickstein, Ivan Naumkin, Fred B. Weissler

摘要:

本文考虑${\mathbb R}^N$上的非线性热方程$u_t - Δu = |u|^αu$,其中$α>0$和$N\ge 1$ .证明了在$0 < α<\frac {4} {N-2}$范围内,对每个$μ>0$,初值为$u_0 (x)= μ|x|^{-\frac {2} {α}}$的Cauchy问题存在无穷多个变号自相似解.该构造是基于对相关反演剖面方程的分析。特别是,我们构造(符号变化)自相似的解决方案,它是已知的,不存在任何本地的,非负的解决方案。

英文摘要:

We consider the nonlinear heat equation $u_t - Δu = |u|^αu$ on ${\mathbb R}^N$, where $α>0$ and $N\ge 1$. We prove that in the range $0 < α<\frac {4} {N-2}$, for every $μ>0$, there exist infinitely many sign-changing, self-similar solutions to the Cauchy problem with initial value $u_0 (x)= μ|x|^{-\frac {2} {α}}$. The construction is based on the analysis of the related inverted profile equation. In particular, we construct (sign-changing) self-similar solutions for positive initial values for which it is known that there does not exist any local, nonnegative solution.

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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