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arXiv 1306.5079math.DG
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平均凸边界流形的比较定理

Comparison Theorems for Manifold with Mean Convex Boundary

Jian Ge

摘要:

设$M^n$是一个具有边界$\partial M$的$n$维黎曼流形.假设里奇曲率从下方由$(n-1)k$界定,对于$k\in \RR$,我们根据边界的中曲率界给出了$ρ(x)=\dis(x, \partial M)$上界的精确估计。当$\partial M$是紧的时,当且仅当$M$等距于空间形式的圆盘时,达到上界。一个Kaehler版本的估计也被证明。证明了Kaehler流形上距离函数的一个Laplace比较定理,并估计了实Laplacian的第一特征值。

英文摘要:

Let $M^n$ be an $n$-dimensional Riemannian manifold with boundary $\partial M$. Assume that Ricci curvature is bounded from below by $(n-1)k$, for $k\in \RR$, we give a sharp estimate of the upper bound of $ρ(x)=\dis(x, \partial M)$, in terms of the mean curvature bound of the boundary. When $\partial M$ is compact, the upper bound is achieved if and only if $M$ is isometric to a disk in space form. A Kaehler version of estimation is also proved. Moreover we prove a Laplace comparison theorem for distance function to the boundary of Kaehler manifold and also estimate the first eigenvalue of the real Laplacian.

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