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arXiv 0909.0590math.DGmath.AP
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黎曼流形中的Willmore型小曲面

Small surfaces of Willmore type in Riemannian manifolds

T. Lamm, J. Metzger

摘要:

本文研究了黎曼流形中Willmore型小曲面的性质。通过\emph{small}曲面,我们表示包含在半径足够小的测地线球中的拓扑球面。特别地,我们证明了如果存在这样的曲面,具有正的中曲率的测地线球$B_r(p)$,任意小半径$r$周围的一个点$p$在黎曼流形,那么数量曲率必须有一个临界点在$p$。作为副产品,我们的估计,我们得到了一个加强版的不存在的结果Mondino \cite{Mondino:2008},这意味着不存在的某些临界点的Willmore功能的数量曲率是非零的区域。

英文摘要:

In this paper we investigate the properties of small surfaces of Willmore type in Riemannian manifolds. By \emph{small} surfaces we mean topological spheres contained in a geodesic ball of small enough radius. In particular, we show that if there exist such surfaces with positive mean curvature in the geodesic ball $B_r(p)$ for arbitrarily small radius $r$ around a point $p$ in the Riemannian manifold, then the scalar curvature must have a critical point at $p$. As a byproduct of our estimates we obtain a strengthened version of the non-existence result of Mondino \cite{Mondino:2008} that implies the non-existence of certain critical points of the Willmore functional in regions where the scalar curvature is non-zero.

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