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arXiv 2010.09149math.APmath.DG
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临界维数下高阶椭圆型方程组弱解的正则性

Regularity of weak solutions to higher order elliptic systems in critical dimensions

Chang-Yu Guo, Chang-Lin Xiang

摘要:

在本文中,我们开发了一个基本的和统一的治疗,在里维埃和Struwe(通讯纯。Appl.Math.2008),在不使用守恒律的情况下,探讨了高阶几何椭圆型方程组在临界维数下的弱解的正则性.结果,在系数函数的临界正则性假设下,我们得到了de Longueville和Gastel的高阶椭圆方程组\cite{deLongueville-Gastel-2019}在临界维数$$Δ^{k}u=\sum_{i=0}^{k-1}Δ^{i}\left\langle V_{i},du\right\rangle +\sum_{i=0}^{k-2}Δ^{i}δ\left(w_{i}du\right) \quad \text{in } B^{2k},$$下解的内部Hölder连续性.这验证了里维耶尔的期望,并提供了一个肯定的答案,在维度四时,$k=2$ Struwe的一个开放的问题。Hölder连续性也是Lamm和Rivière以及de Longueville和Gastel连续性结果的改进。

英文摘要:

In this paper, we develop an elementary and unified treatment, in the spirit of Rivière and Struwe (Comm. Pure. Appl. Math. 2008), to explore regularity of weak solutions of higher order geometric elliptic systems in critical dimensions without using conservation law. As a result, we obtain an interior Hölder continuity for solutions of the higher order elliptic system of de Longueville and Gastel \cite{deLongueville-Gastel-2019} in critical dimensions $$Δ^{k}u=\sum_{i=0}^{k-1}Δ^{i}\left\langle V_{i},du\right\rangle +\sum_{i=0}^{k-2}Δ^{i}δ\left(w_{i}du\right) \quad \text{in } B^{2k},$$ under critical regularity assumptions on the coefficient functions. This verifies an expectation of Rivière, and provides an affirmative answer to an open question of Struwe in dimension four when $k=2$. The Hölder continuity is also an improvement of the continuity result of Lamm and Rivière and de Longueville and Gastel.

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