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arXiv 1306.1417math.AP
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一般区域上半线性heat equations解的爆破

Blow up of solutions of semilinear heat equations in general domains

Valeria Marino, Filomena Pacella, Berardino Sciunzi

摘要:

考虑有界光滑区域$Ω\subset \R^n$上的非线性热方程$v_t -Δv= |v|^{p-1} v$,其边界条件为$n>2$和Dirichlet边界条件.给定$u_{p}$一个满足适当假设的变号平稳解,证明了当$ |θ-1|>0$足够小且$p$足够接近临界指数时,以$θu_{p} $为初值的解在有限时间内爆破.由于对于$θ=1$,解是全局的,这表明,一般来说,解是全局的初始数据集不是星形的。这种现象以前已经观察到的情况下,当域是一个球和固定的解决方案是径向对称的。

英文摘要:

Consider the nonlinear heat equation $v_t -Δv= |v|^{p-1} v$ in a bounded smooth domain $Ω\subset \R^n$ with $n>2$ and Dirichlet boundary condition. Given $u_{p}$ a sign-changing stationary solution fulfilling suitable assumptions, we prove that the solution with initial value $θu_{p} $ blows up in finite time if $ |θ-1|>0$ is sufficiently small and if $p$ is sufficiently close to the critical exponent. Since for $θ=1$ the solution is global, this shows that, in general, the set of the initial data for which the solution is global is not star-shaped. This phenomenon had been previously observed in the case when the domain is a ball and the stationary solution is radially symmetric.

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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