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• W3168294805 abstract "The null curvature condition (NCC) is the requirement that the Ricci curvature of a Lorentzian manifold be nonnegative along null directions, which ensures the focusing of null geodesic congruences. In this note, we show that the NCC together with the causal structure significantly constrain the metric. In particular, we prove that any conformal rescaling of a vacuum spacetime introduces either geodesic incompleteness or negative null curvature, provided the conformal factor is non-constant on at least one complete null geodesic. In the context of bulk reconstruction in AdS/CFT, our results combined with the technique of light-cone cuts can be used in vacuum spacetimes to reconstruct the full metric in regions probed by complete null geodesics reaching the boundary. For non-vacuum spacetimes, our results constrain the conformal factor, giving an approximate reconstruction of the metric." @default.
• W3168294805 created "2021-06-22" @default.
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• W3168294805 date "2021-06-16" @default.
• W3168294805 modified "2023-09-27" @default.
• W3168294805 title "Conformal Rigidity from Focusing" @default.
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• W3168294805 hasPublicationYear "2021" @default.
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