Quantum Hair and Black Hole Information

Abstract

It has been shown that the quantum state of the graviton field outside a black hole horizon carries information about the internal state of the hole. We explain how this allows unitary evaporation: the final radiation state is a complex superposition which depends linearly on the initial black hole state. Under time reversal, the radiation state evolves back to the original black hole quantum state. Formulations of the information paradox on a fixed semiclassical geometry describe only a small subset of the evaporation Hilbert space, and do not exclude overall unitarity.

arXiv comment10 pages. Published version (typos corrected): Physics Letters B Volume 827, 10 April 2022, 136995

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• A Brief History of Hawking's Information Paradox
• Quantum Hair During Gravitational Collapse
• Nonthermal radiation of evaporating black holes
• Semiclassical Dynamics of Hawking Radiation
• Quantum Gravitational Hair in Gravastars and Observational Tests
• Encoded information of mixed correlations: the views from one dimension higher
• Black hole information recovery from gravitational waves
• Quantum geodesics reflecting the internal structure of stars composed of shells
• Black Hole Menagerie, Charged/Dyonic BHs and Radiation from Interacting Dyonic BH Pairs
• Listening to Quantum Gravity?