NOTES ON REAL HYPERSURFACES IN A COMPLEX SPACE FORM

NOTES ON REAL HYPERSURFACES IN A COMPLEX SPACE FORM
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关于复杂空间形式的真实超表面的注释

DOI:
10.4134/bkms.2015.52.1.335
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发表时间:
2015
影响因子:
0.5
通讯作者:
Jong Taek Cho
Jong Taek Cho
中科院分区:
数学4区
文献类型:
--
作者:
Jong Taek Cho

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抽象。本文分别刻画了(A)型齐次真实的超曲面和非齐次复空间形式中直纹真实的超曲面。1.设(Mfn(c),J,eg)是具有常全纯截面曲率c的K¨ ahler结构(J,eg)的n维复空间形式,M是Mfn(c)中的可定向真实的超曲面.则M具有由(J,eg)导出的几乎切触度量结构(η,φ,θ,g)(见第1节)。U.- H. Ki和Y。J.Suh [13]证明了在满足φA+Aφ = 0的复空间形式中不存在真实的超曲面.由此我们可以看出,在非复空间形式中不存在几乎余辛或几乎Kenmotsu真实的超曲面(见第3节命题4)。设P = φA + Aφ。然后证明了P是沿着Reeb流形不变的,即P = 0当且仅当M局部同余于Pn C或Hn C中的(A)型超曲面(定理9).第四节证明了对于非单调复空间形式Mf中的真实的超曲面M
Abstract. We characterize a homogeneous real hypersurface of type (A)or a ruled real hypersurface in a non-flat complex space form, respectively. 1. IntroductionLet (Mf n (c),J,eg) be an n-dimensional complex space form with K¨ahlerianstructure (J,eg) of constant holomorphic sectional curvature c and let M be anorientable real hypersurface in Mf n (c). Then M has an almost contact metricstructure (η,φ,ξ,g) induced from (J,eg) (see Section 1). U.-H. Ki and Y. J.Suh [13] proved that are no real hypersurfaces in a non-flat complex space formsatisfying φA+Aφ = 0. From this we see that there are no almost cosymplecticor almost Kenmotsu real hypersurfaces in a non-flat complex space form (seeProposition 4 in Section 3). We put P = φA + Aφ. Then we prove that Pis invariant along the Reeb flow, that is, £ ξ P = 0 if and only if M is locallycongruent to a homogeneoushypersurface oftype (A) in P n Cor H n C(Theorem9).In Section 4, we prove that for a real hypersurface M in a non-flat com-plex space form Mf
*-复杂空间形式的爱因斯坦真实超曲面
DOI: --
发表时间: 2008
期刊:
影响因子: --
作者:
U. Hertrich-Jeromin;Y. Suyama;Tatsuyoshi Hamada
通讯作者: Tatsuyoshi Hamada