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arXiv 2102.07281math.AP
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$C^1$ -Dini域上的边界唯一延拓与奇异集的大小

Boundary unique continuation on $C^1$-Dini domains and the size of the singular set

Carlos Kenig, Zihui Zhao

摘要:

设$u$是$C^1$域$D$中的调和函数,使得$u$在边界曲面球$\partial D \cap B_{5R}(0)$上为零.我们考虑了它的奇异集(直到边界)$\mathcal{S}(u):=\{X\in \overline{D}: u(X) = |\nabla u(X)| = 0\} $的一个有效形式,并给出了它的$(d-2)$维Minkowski容度的一个估计,它只依赖于以$0$为中心的$u$的某个修正频率函数的上界.当标准频率函数在每一点上单调时,在凸域的内部和边界上,这样的结果是已知的。我们的工作的新颖性Dini域是如何补偿缺乏这样的单调量在边界以及内点。

英文摘要:

Let $u$ be a harmonic function in a $C^1$-Dini domain $D$ such that $u$ vanishes on a boundary surface ball $\partial D \cap B_{5R}(0)$. We consider an effective version of its singular set (up to boundary) $\mathcal{S}(u):=\{X\in \overline{D}: u(X) = |\nabla u(X)| = 0\} $ and give an estimate of its $(d-2)$-dimensional Minkowski content, which only depends on the upper bound of some modified frequency function of $u$ centered at $0$. Such results are already known in the interior and at the boundary of convex domains, when the standard frequency function is monotone at every point. The novelty of our work on Dini domains is how to compensate for the lack of such monotone quantities at boundary as well as interior points.

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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