Entanglement entropy, black holes and holography

Details Entanglement entropy, black holes and holography Entanglement entropy, black holes and holography

2005-10-03

arxiv.org/abs/hep-th/0510021v1

Phys.Lett. B644 (2007) 72-76

Physics

High Energy Physics

High Energy Physics - Theory

4 pages, revtex

Scientific paper

We observe that the entanglement entropy resulting from tracing over a subregion of an initially pure state can grow faster than the surface area of the subregion (indeed, proportional to the volume), in contrast to examples studied previously. The pure states with this property have long-range correlations between interior and exterior modes and are constructed by purification of the desired density matrix. We show that imposing a no-gravitational collapse condition on the pure state is sufficient to exclude faster than area law entropy scaling. This observation leads to an interpretation of holography as an upper bound on the realizable entropy (entanglement or von Neumann) of a region, rather than on the dimension of its Hilbert space.

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