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      Gravity from entanglement for boundary subregions

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          Abstract

          We explore several aspects of the relation between gravity and entanglement in the context of AdS/CFT, in the simple setting of 3 bulk dimensions. Specifically, we consider small perturbations of the AdS metric and the CFT vacuum state and study what can be learnt about the metric perturbation from the Ryu-Takayanagi (RT) formula alone. It is well-known that, if the RT formula holds for all boundary spacelike segments, then the metric perturbation satisfies the linearized Einstein equations throughout the bulk. We generalize this result by showing that, if the RT formula holds for all spacelike segments contained in a certain boundary region, then the metric perturbation satisfies the linearized Einstein equations in a corresponding bulk region (in fact, it is completely determined in that region). We also argue that the same is true for small perturbations of the planar BTZ black hole and the CFT thermal state. We discuss the relation between our results and the ideas of subregion-subregion duality, and we point out that our argument also serves as a holographic proof of the linearized RT formula for boundary segments.

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          Building up spacetime with quantum entanglement

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            Author and article information

            Journal
            05 March 2018
            Article
            1803.01874
            b8d283e3-9340-49ed-8b74-a4dff31ec910

            http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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            18 pages, 5 figures
            hep-th gr-qc math-ph math.MP

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