arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2409.09437math.AP
收藏

非散度型奇异或退化抛物方程的Harnack不等式

Harnack inequality for singular or degenerate parabolic equations in non-divergence form

Sungwon Cho, Junyuan Fang, Tuoc Phan

AI总结:

研究带可测主系数的非散度型奇异/退化抛物方程,引入加权抛物柱体与权平均振荡小性条件,结合摄动法与抛物ABP极值原理,证明Krylov-Safonov型Harnack不等式,得到Hölder正则性与Liouville型定理。

摘要:

本文研究一类非散度型线性抛物方程,其主系数是可测的,且可能具有奇异性或退化性,对应的权函数属于Muckenhoupt权的$A_{1+\ rac{1}{n}}$类。在权函数的加权平均振荡满足某种小性假设的条件下,本文证明了解的Krylov-Safonov型Harnack不等式。为证明该结果,我们引入了一类通用加权抛物柱体,以及关于权函数加权平均振荡的小性条件,并借此建立了若干增长引理。此外,本文还运用了摄动方法,并将抛物型Aleksandrov-Bakelman-Pucci型最大值原理关键地应用于合适的屏障函数以管控解的行为。作为推论,本文得到了解关于拟距离的Hölder正则性估计,以及一个Liouville型定理。

英文摘要:

This paper studies a class of linear parabolic equations in non-divergence form in which the leading coefficients are measurable and they can be singular or degenerate as a weight belonging to the $A_{1+\frac{1}{n}}$ class of Muckenhoupt weights. Krylov-Safonov Harnack inequality for solutions is proved under some smallness assumption on a weighted mean oscillation of the weight. To prove the result, we introduce a class of generic weighted parabolic cylinders and the smallness condition on the weighted mean oscillation of the weight through which several growth lemmas are established. Additionally, a perturbation method is used and the parabolic Aleksandrov-Bakelman-Pucci type maximum principle is crucially applied to suitable barrier functions to control the solutions. As corollaries, Hölder regularity estimates of solutions with respect to a quasi-distance, and a Liouville type theorem are obtained in the paper.

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。

↑