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arXiv 2102.00332math.APmath.DS
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一类具有加权反应的反应扩散方程的永恒解

Eternal solutions for a reaction-diffusion equation with weighted reaction

Razvan Gabriel Iagar, Ariel Sánchez

摘要:

对于$\real^N$中提出的加权反应扩散方程$$ \partial_tu=Δu^m+|x|^σu^p, $$,证明了\emph{eternal solutions}在时间上以指数速率增长的自相似形式的存在性和唯一性,其中$m>1$、$0<p<1$和权重的临界值为$$ σ=\frac{2(1-p)}{m-1}. $$。当$m+p\geq2$时,某些特定解的存在性和唯一性成立。相反,如果$m+p<2$。我们还分类指数自相似的解决方案与不同的界面行为时,$m+p>2$。本文还介绍了对反应对流扩散方程和行波解的一些变换。

英文摘要:

We prove existence and uniqueness of \emph{eternal solutions} in self-similar form growing up in time with exponential rate for the weighted reaction-diffusion equation $$ \partial_tu=Δu^m+|x|^σu^p, $$ posed in $\real^N$, with $m>1$, $0<p<1$ and the critical value for the weight $$ σ=\frac{2(1-p)}{m-1}. $$ Existence and uniqueness of some specific solution holds true when $m+p\geq2$. On the contrary, no eternal solution exists if $m+p<2$. We also classify exponential self-similar solutions with a different interface behavior when $m+p>2$. Some transformations to reaction-convection-diffusion equations and traveling wave solutions are also introduced.

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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