arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1901.01693math.AP
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拟线性抛物型方程弱解的一致有界性

Uniform boundedness for weak solutions of quasilinear parabolic equations

Karthik Adimurthi, Sukjung Hwang

摘要:

本文研究了拟线性抛物型方程\[u_t - \text{div} \mathcal{A}(x,t,\nabla u) = 0, \]弱解的有界性,其中非线性项\[u_t - \text{div} \mathcal{A}(x,t,\nabla u) = 0, \]是在$p$-Laplace算子之后建立的.有界性问题在过去的几十年里受到了广泛的关注,现有的文献表明$\frac{2N}{N+2}<p<2$,$p=2$或$2<p$中的弱解是有界的。证明基本上分为三种情况,主要是因为在过去获得的估计总是包括一个$\frac{1}{p-2}$或$\frac{1}{2-p}$形式的指数,它被放大为$p \rightarrow 2$。本文证明了弱解在全值域$\frac{2N}{N+2} < p < \infty$内的有界性,而不必分别考虑奇异和退化情形.随后,在一个略小的制度$\frac{2N}{N+1} < p < \infty$,我们也证明了一个改进的有界估计。

英文摘要:

In this paper, we study the boundedness of weak solutions to quasilinear parabolic equations of the form \[u_t - \text{div} \mathcal{A}(x,t,\nabla u) = 0, \] where the nonlinearity $\mathcal{A}(x,t,\nabla u)$ is modelled after the well studied $p$-Laplace operator. The question of boundedness has received lot of attention over the past several decades with the existing literature showing that weak solutions in either $\frac{2N}{N+2}<p<2$, $p=2$ or $2<p$ are bounded. The proof is essentially split into three cases mainly because the estimates that have been obtained in the past always included an exponent of the form $\frac{1}{p-2}$ or $\frac{1}{2-p}$ which blows up as $p \rightarrow 2$. In this note, we prove the boundedness of weak solutions in the full range $\frac{2N}{N+2} < p < \infty$ without having to consider the singular and degenerate cases separately. Subsequently, in a slightly smaller regime of $\frac{2N}{N+1} < p < \infty$, we also prove an improved boundedness estimate.

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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