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arXiv 1809.00552math.AP
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具有线性增长的加权反应的拟线性反应扩散方程的爆破剖面

Blow up profiles for a quasilinear reaction-diffusion equation with weighted reaction with linear growth

Razvan Iagar, Ariel Sánchez

摘要:

本文研究了具有非均相反应的二阶反应扩散方程:$$ \partial_tu=\partial_{xx}(u^m) + |x|^σu, $$和$σ>0$的爆破剖面.通过这些研究,我们发现非齐次系数$|x|^σ$对解的爆破行为有很强的影响。首先,它遵循有限时间爆破发生自相似的解决方案$u$,一个功能,不出现在众所周知的自治情况下$σ=0$。此外,我们发现,有三种不同类型的爆破自相似配置文件,这取决于是否指数$σ$是接近于零或不。我们还发现了一个明确的爆炸轮廓。结果表明,当$σ>0$足够小时,\emph{global blow up}发生,而当$σ>0$足够大时,\emph{occurs only at infinity}爆破,并给出了这些现象的自相似解的原型.这项工作是一个更大的程序的一部分,了解非齐次权重的影响,爆破集和利率。

英文摘要:

We study the blow up profiles associated to the following second order reaction-diffusion equation with non-homogeneous reaction: $$ \partial_tu=\partial_{xx}(u^m) + |x|^σu, $$ with $σ>0$. Through this study, we show that the non-homogeneous coefficient $|x|^σ$ has a strong influence on the blow up behavior of the solutions. First of all, it follows that finite time blow up occurs for self-similar solutions $u$, a feature that does not appear in the well known autonomous case $σ=0$. Moreover, we show that there are three different types of blow up self-similar profiles, depending on whether the exponent $σ$ is closer to zero or not. We also find an explicit blow up profile. The results show in particular that \emph{global blow up} occurs when $σ>0$ is sufficiently small, while for $σ>0$ sufficiently large blow up \emph{occurs only at infinity}, and we give prototypes of these phenomena in form of self-similar solutions with precise behavior. This work is a part of a larger program of understanding the influence of non-homogeneous weights on the blow up sets and rates.

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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