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Cutoff-Stable Null Convergence and Directional Rigidity in Bianchi I Spacetimes

Zhou, Ye et al.
arXiv (OAI Expanded) · Papers
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general-relativity-and-quantum-cosmologyhigh-energy-physics-theory
We derive an endpoint-free optical rigidity theorem and use it to separate two rigidity regimes in Bianchi I spacetimes, without assuming that the spatial metric is diagonal in a fixed basis. For a smooth, regular, twist-free null congruence, the affine Raychaudhuri equation expresses a finite null-
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