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arXiv 0709.0436math.DG
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非平坦复空间型实超曲面上沿结构流的Jacobi算子

Jacobi operators along the structure flow on real hypersurfaces in a nonflat complex space form

U-Hang Ki, Hiroyuki Kurihara, Ryoichi Takagi

摘要:

设$M$是复空间型的实超曲面,具有几乎切触度量结构$(ϕ, ξ, η, g)$ .本文研究复空间型中的实超曲面,其结构Jacobi算子$R_ξ=R(\cdot,ξ)ξ$是$ξ$ -平行的.特别地,我们证明了当$R_ξ ϕS=S ϕR_ξ$在$M$上成立时,条件$\nabla_ξ R_ξ=0$刻画了复射影空间或复双曲空间中的$A$型齐次实超曲面,其中$S$表示$M$上的(1,1)型Ricci张量.

英文摘要:

Let $M$ be a real hypersurface of a complex space form with almost contact metric structure $(ϕ, ξ, η, g)$. In this paper, we study real hypersurfaces in a complex space form whose structure Jacobi operator $R_ξ=R(\cdot,ξ)ξ$ is $ξ$-parallel. In particular, we prove that the condition $\nabla_ξ R_ξ=0$ characterizes the homogeneous real hypersurfaces of type $A$ in a complex projective space or a complex hyperbolic space when $R_ξ ϕS=S ϕR_ξ$ holds on $M$, where $S$ denotes the Ricci tensor of type (1,1) on $M$.

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