Comments on quantum gravity and entanglement

Details Comments on quantum gravity and entanglement Comments on quantum gravity and entanglement

2009-07-17

arxiv.org/abs/0907.2939v2

Physics

High Energy Physics

High Energy Physics - Theory

28 pages, 13 figures, v2: minor changes, reference added

Scientific paper

In this note, we attempt to provide some insights into the structure of non-perturbative descriptions of quantum gravity using known examples of gauge-theory / gravity duality. We argue that in familiar examples, a quantum description of spacetime can be associated with a manifold-like structure in which particular patches of spacetime are associated with states or density matrices in specific quantum systems. We argue that quantum entanglement between microscopic degrees of freedom plays an essential role in the emergence of a dual spacetime from the nonperturbative degrees of freedom. In particular, in at least some cases, classically connected spacetimes may be understood as particular quantum superpositions of disconnected spacetimes.

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