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arXiv 1804.09243math.AP
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向量Bernoulli问题自由边界的正则性

Regularity of the free boundary for the vectorial Bernoulli problem

Dario Mazzoleni, Susanna Terracini, Bozhidar Velichkov

摘要:

本文研究了向量值Bernoulli问题的自由边界的正则性,边界数据不作任何符号假设。更确切地说,给定一个开的,光滑的有限测度集$D\subset \mathbb{R}^d$,$Λ>0$和$φ_i\in H^{1/2}(\partial D)$,我们处理\[ \min{\left\{\sum_{i=1}^k\int_D|\nabla v_i|^2+Λ\Big|\bigcup_{i=1}^k\{v_i\not=0\}\Big|\;:\;v_i=φ_i\;\mbox{on }\partial D\right\}}. \]。我们证明了,对于任何最优向量$U=(u_1,\dots, u_k)$,自由边界$\partial (\cup_{i=1}^k\{u_i\not=0\})\cap D$是由一个正则部分,它是相对开放的,局部的$C^\infty$函数的图,一个奇异部分,它是相对封闭的,最多有Hausdorff维数$d-d^*$,对于一个$d^*\in\{5,6,7\}$和一组分支(两相)点,这是相对封闭的和有限的$\mathcal{H}^{d-1}$措施。我们的论证是基于自由边界规则部分的NTA结构。

英文摘要:

In this paper we study the regularity of the free boundary for a vector-valued Bernoulli problem, with no sign assumptions on the boundary data. More precisely, given an open, smooth set of finite measure $D\subset \mathbb{R}^d$, $Λ>0$ and $φ_i\in H^{1/2}(\partial D)$, we deal with \[ \min{\left\{\sum_{i=1}^k\int_D|\nabla v_i|^2+Λ\Big|\bigcup_{i=1}^k\{v_i\not=0\}\Big|\;:\;v_i=φ_i\;\mbox{on }\partial D\right\}}. \] We prove that, for any optimal vector $U=(u_1,\dots, u_k)$, the free boundary $\partial (\cup_{i=1}^k\{u_i\not=0\})\cap D$ is made of a regular part, which is relatively open and locally the graph of a $C^\infty$ function, a singular part, which is relatively closed and has Hausdorff dimension at most $d-d^*$, for a $d^*\in\{5,6,7\}$ and by a set of branching (two-phase) points, which is relatively closed and of finite $\mathcal{H}^{d-1}$ measure. Our arguments are based on the NTA structure of the regular part of the free boundary.

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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