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arXiv 1802.09176math.AP
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拟线性抛物型方程很弱解的边界高阶可积性

Boundary higher integrability for very weak solutions of quasilinear parabolic equations

Karthik Adimurthi, Sun-Sig Byun

摘要:

我们证明边界更高的可积性的(空间)梯度的\emph{very weak}解决方案的形式$$u_t - \text{div}\,\mathcal{A}(x,t, \nabla u)=0 \quad \text{on} \ Ω\times \mathbb{R},$$的准线性抛物型方程的非线性结构$\text{div}\,\mathcal{A}(x, t,\nabla u)$建模后的$p$ -拉普拉斯算子。为此,我们证明了梯度在边界附近满足一个逆的赫尔德不等式.为了做到这一点,我们构造了一个合适的检验函数,它是Lipschitz连续的,并保持边界值。\emph{These results are new even for linear parabolic equations on domains with smooth boundary and make no assumptions on the smoothness of $\mathcal{A}(x,t,\nabla u)$}。这些结果也适用于系统以及高阶抛物型方程。

英文摘要:

We prove boundary higher integrability for the (spatial) gradient of \emph{very weak} solutions of quasilinear parabolic equations of the form $$u_t - \text{div}\,\mathcal{A}(x,t, \nabla u)=0 \quad \text{on} \ Ω\times \mathbb{R},$$ where the non-linear structure $\text{div}\,\mathcal{A}(x, t,\nabla u)$ is modelled after the $p$-Laplace operator. To this end, we prove that the gradients satisfy a reverse Hölder inequality near the boundary. In order to do this, we construct a suitable test function which is Lipschitz continuous and preserves the boundary values. \emph{These results are new even for linear parabolic equations on domains with smooth boundary and make no assumptions on the smoothness of $\mathcal{A}(x,t,\nabla u)$}. These results are also applicable for systems as well as higher order parabolic equations.

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