# A brief history of Hawking's information paradox

@article{Calmet2022ABH, title={A brief history of Hawking's information paradox}, author={Xavier Calmet and Stephen D. H. Hsu}, journal={Europhysics Letters}, year={2022}, volume={139} }

In this invited review, we describe Hawking's information paradox and a recently proposed resolution of it. Explicit calculations demonstrate the existence of quantum hair on black holes, meaning that the quantum state of the external graviton field depends on the internal state of the black hole. Simple quantum mechanics then implies that Hawking radiation amplitudes depend on the internal state, resulting in a pure final radiation state that preserves unitarity and, importantly, violates a…

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