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arXiv 1306.0120math.DG
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紧Lorentz流形的Abel完整性

Completeness of compact Lorentzian manifolds with Abelian holonomy

Thomas Leistner, Daniel Schliebner

摘要:

我们解决的问题,找到条件下,一个紧凑的洛伦兹流形是测地完备的,一个属性,这始终适用于紧凑的黎曼流形。已知紧致洛伦兹流形是测地线完备的,如果它是齐次的,或具有常曲率,或允许类时共形向量场。我们考虑某些洛仑兹流形与阿贝尔holonomy,这是局部建模的所谓的pp波,并在一般情况下,不满足任何上述条件。%的条件,即它们的曲率将正交于向量场的向量发送到向量场的倍数。我们证明了紧PP波是由一个向量空间的普遍覆盖,确定度量的普遍覆盖,并证明了他们是测地完备的。利用这一点,我们证明了每一个Ricci平坦紧致pp波是一个平面波。

英文摘要:

We address the problem of finding conditions under which a compact Lorentzian manifold is geodesically complete, a property, which always holds for compact Riemannian manifolds. It is known that a compact Lorentzian manifold is geodesically complete if it is homogeneous, or has constant curvature, or admits a time-like conformal vector field. We consider certain Lorentzian manifolds with Abelian holonomy, which are locally modelled by the so called pp-waves, and which, in general, do not satisfy any of the above conditions. %the condition that their curvature sends vectors that are orthogonal to the vector field to a multiple of the vector field. We show that compact pp-waves are universally covered by a vector space, determine the metric on the universal cover, and prove that they are geodesically complete. Using this, we show that every Ricci-flat compact pp-wave is a plane wave.

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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