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arXiv 2108.09088math.APmath.DS
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一般维数下带权反应的反应扩散方程的自相似爆破模式

Self-similar blow-up patterns for a reaction-diffusion equation with weighted reaction in general dimension

Razvan Gabriel Iagar, Ana I. Muñoz, Ariel Sánchez

摘要:

本文对下列具有无界权的反应扩散方程的有限时间爆破剖面进行了分类:在任意空间维上的$$ \partial_tu=Δu^m+|x|^σu^p, $$,指数为$x\in\mathbf{R}^N$,$t\geq0$和指数为$m>1$,$p\in(0,1)$和$σ>2(1-p)/(m-1)$的方程.我们证明了爆破配置文件中存在的向后自相似形式的参数范围内,从而表明,无界的重量有很强的影响力的动力学方程,合并的非线性反应,以产生有限时间爆破。我们还证明了所有的爆破剖面都是\emph{compactly supported},并且在原点附近可能呈现两种不同类型的界面行为和三种不同的可能\emph{good behaviors},直接影响解的爆破行为.我们根据$σ$的大小对这些不同的局部行为进行分类。本文在维数$N>1$中推广了作者以前在维数$N=1$中的结果,并且还包括一些更精细的分类,即使在维数$N=1$中也是新的。

英文摘要:

We classify the finite time blow-up profiles for the following reaction-diffusion equation with unbounded weight: $$ \partial_tu=Δu^m+|x|^σu^p, $$ posed in any space dimension $x\in\mathbf{R}^N$, $t\geq0$ and with exponents $m>1$, $p\in(0,1)$ and $σ>2(1-p)/(m-1)$. We prove that blow-up profiles in backward self-similar form exist for the indicated range of parameters, showing thus that the unbounded weight has a strong influence on the dynamics of the equation, merging with the nonlinear reaction in order to produce finite time blow-up. We also prove that all the blow-up profiles are \emph{compactly supported} and might present two different types of interface behavior and three different possible \emph{good behaviors} near the origin, with direct influence on the blow-up behavior of the solutions. We classify all these profiles with respect to these different local behaviors depending on the magnitude of $σ$. This paper generalizes in dimension $N>1$ previous results by the authors in dimension $N=1$ and also includes some finer classification of the profiles for $σ$ large that is new even in dimension $N=1$.

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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