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arXiv 0812.5053gr-qcmath.DG
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Einstein时空的局部叶理和最佳正则性

Local foliations and optimal regularity of Einstein spacetimes

Bing-Long Chen, Philippe G. LeFloch

摘要:

我们研究了指向时空的局部正则性,指向时空是指向时间的洛伦兹流形,其中选择了一个点和一个指向未来的单位类时向量(观察者)。我们的主要结果涵盖了爱因斯坦真空时空类。仅在曲率和内射性的条件下,我们建立了定义在一定大小的球上的局部坐标图的存在性,其中度量系数具有最佳正则性。证明是基于定量估计,一方面,为一个恒定的平均曲率(CMC)叶理由类空超曲面定义的局部附近的观察者,另一方面,在局部坐标的度量空间谐波在每个CMC切片。本文的结果和技巧在广义相对论的背景下,对研究爱因斯坦方程解的长时间行为是有用的。

英文摘要:

We investigate the local regularity of pointed spacetimes, that is, time-oriented Lorentzian manifolds in which a point and a future-oriented, unit timelike vector (an observer) are selected. Our main result covers the class of Einstein vacuum spacetimes. Under curvature and injectivity bounds only, we establish the existence of a local coordinate chart defined in a ball with definite size in which the metric coefficients have optimal regularity. The proof is based on quantitative estimates, on one hand, for a constant mean curvature (CMC) foliation by spacelike hypersurfaces defined locally near the observer and, on the other hand, for the metric in local coordinates that are spatially harmonic in each CMC slice. The results and techniques in this paper should be useful in the context of general relativity for investigating the long-time behavior of solutions to the Einstein equations.

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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