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A brief history of Hawking’s information paradox

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journal contribution
posted on 2023-06-10, 04:17 authored by Xavier CalmetXavier Calmet, Stephen D H Hsu
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 factorization assumption which is central to the original paradox. Black hole information is encoded in entangled macroscopic superposition states of the radiation.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

European Physical Society Letters (EPL)

ISSN

0295-5075

Publisher

Institute of Physics Publishing

Issue

4

Volume

139

Page range

1-5

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2022-07-19

First Compliant Deposit (FCD) Date

2022-07-18

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