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arXiv 1202.2674math.AP
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具有梯度吸收项的非线性抛物型方程的$L^{\infty}$估计和唯一性结果

$L^{\infty}$ estimates and uniqueness results for nonlinear parabolic equations with gradient absorption terms

Marie-Françoise Bidaut-Véron, Nguyen Anh Dao

摘要:

本文研究了粘性Hamilton-Jacobi问题\[ \left\{\begin{array} [c]{c}% u_{t}-νΔu+|\nabla u|^{q}=0, u(0)=u_{0}, \end{array} \right. \]在$Q_{Ω,T}=Ω\times\left(0,T\right) ,$中的非负解,其中$q>1,ν\geqq 0,T\in\left(0,\infty\right] ,$和$Ω=\mathbb{R}^{N}$或$Ω$是光滑有界区域,$u_{0}\in L^{r}(Ω),r\geqq1,$或$u_{0}% \in\mathcal{M}_{b}(Ω).$我们给出了$L^{\infty}$的衰减估计,对\textit{any weak solution},\textit{without any conditions a},$\left\| x\right\| \rightarrow\infty,$和\textit{without uniqueness assumptions}都是有效的.因此,我们得到了新的唯一性结果,当$u_{0}\in \mathcal{M}_{b}(Ω)$和$q<(N+2)/(N+1),$或$u_{0}\in L^{r}(Ω)$和$q<(N+2r)/(N+r).$我们还推广了一些衰减性质的拟线性方程的模型类型\[ u_{t}-Δ_{p}u+\left\| u\right\| ^{λ-1}u|\nabla u|^{q}=0 \]其中$p>1,λ\geqq0,$和$u$是一个有符号的解决方案。

英文摘要:

Here we study the nonnegative solutions of the viscous Hamilton-Jacobi problem \[ \left\{\begin{array} [c]{c}% u_{t}-νΔu+|\nabla u|^{q}=0, u(0)=u_{0}, \end{array} \right. \] in $Q_{Ω,T}=Ω\times\left(0,T\right) ,$ where $q>1,ν\geqq 0,T\in\left(0,\infty\right] ,$ and $Ω=\mathbb{R}^{N}$ or $Ω$ is a smooth bounded domain, and $u_{0}\in L^{r}(Ω),r\geqq1,$ or $u_{0}% \in\mathcal{M}_{b}(Ω).$ We show $L^{\infty}$ decay estimates, valid for \textit{any weak solution}, \textit{without any conditions a}s $\left\| x\right\| \rightarrow\infty,$ and \textit{without uniqueness assumptions}. As a consequence we obtain new uniqueness results, when $u_{0}\in \mathcal{M}_{b}(Ω)$ and $q<(N+2)/(N+1),$ or $u_{0}\in L^{r}(Ω)$ and $q<(N+2r)/(N+r).$ We also extend some decay properties to quasilinear equations of the model type \[ u_{t}-Δ_{p}u+\left\| u\right\| ^{λ-1}u|\nabla u|^{q}=0 \] where $p>1,λ\geqq0,$ and $u$ is a signed solution.

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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