arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0905.4919math.DG
收藏

具有双翘曲结构的半黎曼流形

Semi-Riemannian manifolds with a doubly warped structure

Manuel Gutiérrez, Benjamín Olea

摘要:

我们调查流形作为一个商的双翘曲产品。我们表明,他们总是覆盖的产品的两个合适的叶。这使我们能够证明,在正则性假设下,这些流形是一个双重翘曲产品的零措施由工会的叶子形成的子集。我们还得到了一个确保整个流形分解的充要条件,并利用它给出了几何性质的充分条件。最后,研究了非单连通情形下的直积分解的唯一性。

英文摘要:

We investigate manifolds obtained as a quotient of a doubly warped product. We show that they are always covered by the product of two suitable leaves. This allows us to prove, under regularity hypothesis, that these manifolds are a doubly warped product up to a zero measure subset formed by an union of leaves. We also obtain a necessary and sufficient condition which ensures the decomposition of the whole manifold and use it to give sufficient conditions of geometrical nature. Finally, we study the uniqueness of direct product decomposition in the non simply connected case.

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。

↑