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arXiv 0908.4545math.DG
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广义Obata定理及其在叶理上的应用

Generalized Obata theorem and its applications on foliations

Seoung Dal Jung, Keum Ran Lee, Ken Richardson

摘要:

我们证明了关于叶理的广义Obata定理。设M是一个完备黎曼流形,其叶理F的余维为$q>1$,度量为类三角形度量.则$(M, F)$与(q+1)维欧几里得空间中半径为1/c的q球横截等距,当且仅当存在一个非常数基函数f使得对于所有基本法向量域X,$ \nabla_X df = -c^2 f X^ \flat,其中c是正常数,\nabla是正常束上的连接。利用推广的Obata定理,对这类流形进行了分类。

英文摘要:

We prove the generalized Obata theorem on foliations. Let M be a complete Riemannian manifold with a foliation F of codimension $q>1$ and a bundle-like metric. Then $(M, F)$ is transversally isometric to the q-sphere of radius 1/c in (q+1)-dimensional Euclidean space endowed with the action of a discrete subgroup of the orthogonal group O(q), if and only if there exists a non-constant basic function f such that $\nabla_X df = -c^2 f X^\flat for all basic normal vector fields X, where c is a positive constant and \nabla is the connection on the normal bundle. By the generalized Obata theorem, we classify such manifolds which admit transversal non-isometric conformal fields.

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