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2019

Simple holographic models of black hole evaporation

Akers, Chris, Engelhardt, Netta, Harlow, Daniel

Understand

Several recent papers have shown a close relationship between entanglement wedge reconstruction and the unitarity of black hole evaporation in AdS/CFT.

The analysis of these papers however has a rather puzzling feature: all calculations are done using bulk dynamics which are essentially those Hawking used to predict information loss, but applying ideas from entanglement wedge reconstruction seems to suggest a Page curve which is consistent with information conservation.
Why should two different calculations in the same model give different answers for the Page curve? In this note we present a new pair of models which clarify this situation.
Our first model gives a holographic illustration of unitary black hole evaporation, in which the analogue of the Hawking radiation purifies itself as expected, and this purification is reproduced by the entanglement wedge analysis.