Real hypersurfaces in quaternionic space forms.

Real hypersurfaces in quaternionic space forms.
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DOI:
10.1515/crll.1991.419.9
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发表时间:
1991
期刊:
Journal für die reine und angewandte Mathematik (Crelles Journal)
影响因子:
--
通讯作者:
J. Berndt
J. Berndt
中科院分区:
其他
文献类型:
--
作者:
J. Berndt

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显然,黎曼流形的每个全脐超曲面都是曲率适应的。在常截面曲率的空间中,每个超曲面都是曲率适应的。但在其他环境空间中,我们的定义是限制性的。例如,在具有常全纯截面曲率的非欧几里德空间中,曲率适应的(真实的)超曲面就是Hopf超曲面(参见[3]中的Hopf超曲面概念)。在局部对称空间中,事实证明,对于曲率适应超曲面几何的研究,雅可比场论可能非常有用(s可以在第5节中看到)。
Obviously, every totally umbilical hypersurface of a Riemannian manifold is curvature-adapted. In spaces of constant sectional curvature every hypersurface is curvature-adapted. But in other ambient spaces our definition is restrictive. For example, in non-Euclidean spaces of constant holomorphic sectional curvature the curvature-adapted (real) hypersurfaces are exactly the Hopf hypersurfaces (see [3] for the notion of Hopf hypersurfaces). In locally Symmetrie spaces it turns out that for the investigation of the geometry of curvature-adapted hypersurfaces Jacobi field theory may be very useful ( s can be seen in section 5).