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局部对称的伪黎曼流形中的极大类空子流形
Maximal space like submanifolds in locally symmetric pseudo Riemannian spaces.
【摘要】 :Nn+ pp 为 n+ p维局部对称的完备连通伪黎曼流形 ,它的截面曲率 KN 满足 c1 ≤ KN≤ c2 .Mn为 Nn+ pp 中的极大类空子流形 .给出了 Mn 完备或紧致情况下它的第二基本形式模长平方的估计 .推广了已有的结论
【Abstract】 Let N n+p p be a locally symmetric, complete and connected pseudo Riemannian manifold, whose sectional curvature K N satisties c 1≤K N≤c 2. Let M n be a maximal spaclike submanifold in N n+p p . An estimate is given for the square of the length of the second fundamental form of M n when M n is complete or compact, and the results obtained by Ishihara and W. D. Song respectively are generalized.
【关键词】 伪黎曼流形;
极大类空;
局部对称;
全测地;
【Key words】 pseudo Riemannian manifold; maximal spacelike; locally symmetric; totally geodesic;
【Key words】 pseudo Riemannian manifold; maximal spacelike; locally symmetric; totally geodesic;
【基金】 国家自然科学基金青年基金资助 (10 2 0 10 2 8)
- 【文献出处】 浙江大学学报(理学版) ,Journal of Zhejiang University(Sciences Edition) , 编辑部邮箱 ,2003年02期
- 【分类号】O186.1
- 【被引频次】11
- 【下载频次】86