Local quenches, bulk entanglement entropy and a unitary Page curve
arXiv:2004.15010 · doi:10.1007/JHEP08(2020)152
Abstract
Quantum corrections to the entanglement entropy of matter fields interacting with dynamical gravity have proven to be very important in the study of the black hole information problem. We consider a one-particle excited state of a massive scalar field infalling in a pure AdS geometry and compute these corrections for bulk subregions anchored on the AdS boundary. In the dual CFT, the state is given by the insertion of a local primary operator and its evolution thereafter. We calculate the area and bulk entanglement entropy corrections at order , both in AdS and its CFT dual. The two calculations match, thus providing a non-trivial check of the FLM formula in a dynamical setting. Further, we observe that the bulk entanglement entropy follows a Page curve. We explain the precise sense in which our setup can be interpreted as a simple model of black hole evaporation and comment on the implications for the information problem.
arXiv comment52 pages + 2 appendices. Multiple figures. v2: new title, significantly improved introduction and minor changes in the text. v3: extended discussion on interpretation. Version to appear in JHEP
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