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arXiv 1003.4189math.AP
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一类抛物型反应扩散方程组的后向爆破估计和初始迹

Backward blow-up estimates and initial trace for a parabolic system of reaction-diffusion

Marie-Françoise Bidaut-Véron, Marta Garcia-Huidobro, Cecilia Yarur

摘要:

本文研究了竞争型抛物半线性方程组\[ \left\{\begin{array} [c]{c}% u_{t}-Δu+v^{p}=0, v_{t}-Δv+u^{q}=0, \end{array} \right. \]在$Ω\times\left(0,T\right) $中的正解,其中$Ω$是$\mathbb{R}^{N},$和$p,q>0,$ $pq\neq1.$的一个区域,尽管缺乏比较原理,我们证明了局部上估计在超线性的情况下$pq>1$的形式\[ u(x,t)\leqq Ct^{-(p+1)/(pq-1)},\qquad v(x,t)\leqq Ct^{-(q+1)/(pq-1)}% \]在$ω\times\left(0,T_{1}\right) ,$对于任何域PDMATHAMV和$T_{1}\in\left(0,T\right) ,$和$C=C(N,p,q,T_{1}% ,ω).$对于$p,q>1,$我们证明了初始迹的存在性最后证明了当p,q \geqq 1+2/N时,时间$0$上的点奇点是可去的.

英文摘要:

In this article we study the positive solutions of the parabolic semilinear system of competitive type \[ \left\{\begin{array} [c]{c}% u_{t}-Δu+v^{p}=0, v_{t}-Δv+u^{q}=0, \end{array} \right. \] in $Ω\times\left(0,T\right) $, where $Ω$ is a domain of $\mathbb{R}^{N},$ and $p,q>0,$ $pq\neq1.$ Despite of the lack of comparison principles, we prove local upper estimates in the superlinear case $pq>1$ of the form \[ u(x,t)\leqq Ct^{-(p+1)/(pq-1)},\qquad v(x,t)\leqq Ct^{-(q+1)/(pq-1)}% \] in $ω\times\left(0,T_{1}\right) ,$ for any domain $ω\subset\subsetΩ$ and $T_{1}\in\left(0,T\right) ,$ and $C=C(N,p,q,T_{1}% ,ω).$ For $p,q>1,$ we prove the existence of an initial trace at time 0, which is a Borel measure on $Ω.$ Finally we prove that the punctual singularities at time $0$ are removable when $p,q\geqq1+2/N.

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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