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arXiv 0906.3487math.SGmath.DGmath.GT
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接触度量三维流形的紧性

Tightness in contact metric 3-manifolds

John B. Etnyre, Rafal Komendarczyk, Patrick Massot

摘要:

本文研究了黎曼几何与三维流形上切触结构的整体性质之间的关系。特别是我们证明了一个类似的球面定理从黎曼几何中设置的接触几何。具体地说,如果一个给定的三维切触流形(M,M)允许一个具有正的4/9-捏曲率的完全相容黎曼度量,那么其基础的切触结构是紧的;特别地,被拉回到万有覆盖的切触结构是S ^3上的标准切触结构。我们还描述了几何条件,在三维空间中的普遍紧张的非正曲率设置。

英文摘要:

This paper begins the study of relations between Riemannian geometry and global properties of contact structures on 3-manifolds. In particular we prove an analog of the sphere theorem from Riemannian geometry in the setting of contact geometry. Specifically, if a given three dimensional contact manifold (M,ξ) admits a complete compatible Riemannian metric of positive 4/9-pinched curvature then the underlying contact structure ξis tight; in particular, the contact structure pulled back to the universal cover is the standard contact structure on S^3. We also describe geometric conditions in dimension three for ξto be universally tight in the nonpositive curvature setting.

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