Blackbody radiation contains (on average) an entropy of 3.9± 2.5 bits per photon. If the emission process

is unitary, then this entropy is exactly compensated by “hidden information” in the correlations. We

extend this argument to the Hawking radiation from GR black holes, demonstrating that the assumption

of unitarity leads to a perfectly reasonable entropy/information budget. The key technical aspect of our

calculation is a variant of the “average subsystem” approach developed by Page, which we extend beyond

bipartite pure systems, to a tripartite pure system that considers the influence of the environment.

© 2017 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license

is unitary, then this entropy is exactly compensated by “hidden information” in the correlations. We

extend this argument to the Hawking radiation from GR black holes, demonstrating that the assumption

of unitarity leads to a perfectly reasonable entropy/information budget. The key technical aspect of our

calculation is a variant of the “average subsystem” approach developed by Page, which we extend beyond

bipartite pure systems, to a tripartite pure system that considers the influence of the environment.

© 2017 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license

typ: | article |
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journal: | Physics Letters B |

volume: | 776 |

pages: | 10-16 |

year: | 2018 |

grant: | Centrum Alberta Einsteina pro gravitaci a astrofyziku, GAČR 14-37086G, 2014-2018 |

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physlettb776.pdf (395.01 kB) |