论文摘要
自黎曼几何诞生以来,黎曼流形的研究一直成为黎曼几何研究的核心内容。对外围空间具有良好对称性的黎曼流形中子流形的研究特别是对球空间中子流形的研究已经获得了非常丰富的结果。当把外围空间推广到其它情形如局部对称空间或Lorentz空间时,对此类空间中的黎曼流形的研究,许多学者已经获得了不少具有重要价值的研究成果。本文利用外微分法、活动标架法、积分法以及局部和整体相结合的方法研究了局部对称空间中的超曲面和局部对称Lorentz空间中的类空超曲面及De Sitter空间中的线性Weingarten类空超曲面的各种内在量之间所蕴含的几何性质,并获得了内在量满足某种关系时的内蕴刚性定理,具体地讲,本文的主要研究成果有以下几个方面。1.研究了局部对称空间中具有常数量曲率的超曲面,利用丘成桐教授的自伴随算子给出了此超曲面的第二基本形式满足一定刚性条件时全脐的内蕴刚性定理,从而推广了李海中教授的一个结论。2.首先给出了局部对称Lorentz空间的定义,利用丘成桐教授和Omori教授的广义极大值原理以及自伴随算子分别研究了此空间中具有常平均曲率的完备类空超曲面和常数量曲率的紧致类空超曲面,得出了两个内蕴刚性定理,把欧阳崇祯、李镇琦和刘西民等人的主要结果推广到局部对称Lorentz空间。3.首先引入de Sitter空间中线性Weingarten类空超曲面的概念并利用丘成桐和陈省身的自伴随算子口研究了此线性Weingarten类空超曲面,并得到了两个重要的内蕴刚性定理。其推广了Zheng[19]和Li[20]关于de Sitter空间中具有常平均曲率和常数量曲率类空超曲面的两个重要结果。
论文目录
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标签：黎曼流形论文; 局部对称论文; 超曲面论文; 空间论文; 内蕴刚性论文; 常平均曲率论文; 常数量曲率论文; 类空超曲面论文; 线性类空超曲面论文;