arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1207.6344math.APmath.DG
收藏

一种新的基于距离函数的对称性判据及其在PDE中的应用

A new symmetry criterion based on the distance function and applications to PDE's

Graziano Crasta, Ilaria Fragalà

摘要:

证明了:若$Ω\subset \mathbb{R}^n$是$C^2$类的开有界星形整环,则函数$$φ(y) = \int_0^{λ(y)} \prod_{j=1}^{n-1}[1-t κ_j(y)]\, dt$$在$\partial Ω$上的恒常性蕴涵着$Ω$是球.这里,$k_j(y)$和$λ(y)$分别表示边界点$y \in \partial Ω$的主曲率和截止值。我们将这个几何结果应用于不同的对称性问题的偏微分方程:一个超定系统的蒙格-康托洛维奇型方程(这可以被视为限制为$p \to + \infty$的Serrin的对称性问题的$p$ -拉普拉斯算子),和方程的发散形式的解决方案只依赖于从边界的距离在一些子集的域。

英文摘要:

We prove that, if $Ω\subset \mathbb{R}^n$ is an open bounded starshaped domain of class $C^2$, the constancy over $\partial Ω$ of the function $$φ(y) = \int_0^{λ(y)} \prod_{j=1}^{n-1}[1-t κ_j(y)]\, dt$$ implies that $Ω$ is a ball. Here $k_j(y)$ and $λ(y)$ denote respectively the principal curvatures and the cut value of a boundary point $y \in \partial Ω$. We apply this geometric result to different symmetry questions for PDE's: an overdetermined system of Monge-Kantorovich type equations (which can be viewed as the limit as $p \to + \infty$ of Serrin's symmetry problem for the $p$-Laplacian), and equations in divergence form whose solutions depend only on the distance from the boundary in some subset of their domain.

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。

↑