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arXiv 1302.4593math.DG
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奇异黎曼叶理及其对正曲率和非负曲率的应用

Singular Riemannian foliations and applications to positive and nonnegative curvature

Fernando Galaz-Garcia, Marco Radeschi

摘要:

本文确定了紧致单连通黎曼流形上闭奇异黎曼叶状结构的正则叶的基本群的结构。我们还研究了闭奇异黎曼叶理的叶子同胚到非球面或Bieberbach流形。这些叶理,我们称之为A-叶理和B-叶理,分别推广了黎曼流形上的等距环面作用。我们将我们的结果应用于具有正或非负截面曲率的紧致单连通Riemannian 4-和5-流形的分类问题。

英文摘要:

We determine the structure of the fundamental group of the regular leaves of a closed singular Riemannian foliation on a compact, simply connected Riemannian manifold. We also study closed singular Riemannian foliations whose leaves are homeomorphic to aspherical or to Bieberbach manifolds. These foliations, which we call A-foliations and B-foliations, respectively, generalize isometric torus actions on Riemannian manifolds. We apply our results to the classification problem of compact, simply connected Riemannian 4- and 5-manifolds with positive or nonnegative sectional curvature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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