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The entropy of Hawking radiation
Reviews of Modern Physics  (IF50.485),  Pub Date : 2021-07-21, DOI: 10.1103/revmodphys.93.035002
Ahmed Almheiri, Thomas Hartman, Juan Maldacena, Edgar Shaghoulian, Amirhossein Tajdini

In this review, recent progress on the black hole information problem that involves a new understanding of how to calculate the entropy of Hawking radiation is described. The review shows how the method for computing gravitational fine-grained entropy, developed over the past 15 years, can be extended to capture the entropy of Hawking radiation. This technique reveals large corrections needed for the entropy to be consistent with unitary black hole evaporation.