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arXiv 1211.2115math.DG
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论Killing潜水的分类及其等距性

On the classification of Killing submersions and their isometries

José M. Manzano

摘要:

Killing浸没是从可定向三维流形到可定向曲面的黎曼浸没,该曲面的纤维是三维流形中单位Killing向量场的积分曲线。我们对单连通黎曼曲面上的Killing淹没进行了分类,并给出了包括单连通常高斯曲率曲面上的Killing淹没在内的许多Killing淹没的显式模型.我们还充分描述了保持垂直方向的全空间的等距。因此,我们证明了只有E(κ,τ)-空间才是具有Killing淹没结构的单连通齐性三维流形,其等距群的维数至少为4。

英文摘要:

A Killing submersion is a Riemannian submersion from an orientable 3-manifold to an orientable surface whose fibers are the integral curves of a unit Killing vector field in the 3-manifold. We classify all Killing submersions over simply-connected Riemannian surfaces and give explicit models for many Killing submersions including those over simply-connected constant Gaussian curvature surfaces. We also fully describe the isometries of the total space preserving the vertical direction. As a consequence, we prove that the only simply-connected homogeneous 3-manifolds which admit a structure of Killing submersion are the E(κ,τ)-spaces, whose isometry group has dimension at least 4.

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