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On Spacetime Entanglement

Recently, it has been proposed that in quantum gravity, the entanglement entropy of a general region should be finite and the leading contribution is given by the Bekenstein-Hawking area law. This spacetime entanglement conjecture motivates the study of 'hole-ography' in the AdS/CFT correspondence. The latter construction allows the Bekenstein-Hawking entropy of codimension-two surfaces in the bulk spacetime to be evaluated in terms of the entanglement entropies evaluated in the boundary theory.