【摘要】 采用活动标架法,得到de Sitter空间中类时子流形的Ricci恒等式和第二基本形式长度平方的Laplacian,并得到de Sitter空间中紧致极大类时子流形成为全测地子流形的一些充分条件.更多还原

【Abstract】 Based on the moving frams,the Ricci identity and the Laplacian about the squared norm of the second fundamental form for the timelike submanifolds in de Sitter space were calculated,and some necessary conditions for the compact maximal timelike submanifold in de Sitter space were given.更多还原