Variational formulas of higher order mean curvatures
首发时间:2011-11-08
Abstract:In this paper, we establish the first variational formula and its Euler-Lagrange equation for the total 2p-th mean curvature functional of a n-dimensional submanifold M in a general (n+m)-dimensional Riemannian manifold N. As an example, we prove that closed complex submanifolds in complex projective spaces are critical points of the total 2p-th mean curvature functional, called relatively 2p-minimal submanifolds, for all p. At last, we discuss the relations between relatively 2p-minimal submanifolds and austere submanifolds in real space forms, as well as a special variational problem.
keywords: Differential Geometry 2p-minimal mean curvature austere submanifold
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高阶平均曲率的变分公式
摘要:本文建立了一般黎曼流形中n维子流形的2p阶平均曲率泛函的第一变分公式和欧拉-拉格朗日方程。作为例子,证明了复射影空间中的闭复子流形是这种变分问题的临界点,称为相对2p极小子流形,对所有p成立。最后,讨论了实空间形式中相对2p极小子流形和austere子流形之间的关系,以及一个特殊变分问题。
关键词: 微分几何 2p极小 平均曲率 austere子流形
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