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Black hole remnants and the information loss paradox
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Number of Authors: 3
2015 (English)In: Physics reports, ISSN 0370-1573, E-ISSN 1873-6270, Vol. 603, 1-45 p.Article, review/survey (Refereed) Published
Abstract [en]

Forty years after the discovery of Hawking radiation, its exact nature remains elusive. If Hawking radiation does not carry any information out from the ever shrinking black hole, it seems that unitarity is violated once the black hole completely evaporates. On the other hand, attempts to recover information via quantum entanglement lead to the firewall controversy. Amid the confusions, the possibility that black hole evaporation stops with a remnant has remained unpopular and is often dismissed due to some undesired properties of such an object. Nevertheless, as in any scientific debate, the pros and cons of any proposal must be carefully scrutinized. We fill in the void of the literature by providing a timely review of various types of black hole remnants, and provide some new thoughts regarding the challenges that black hole remnants face in the context of the information loss paradox and its latest incarnation, namely the firewall controversy. The importance of understanding the role of curvature singularity is also emphasized, after all there remains a possibility that the singularity cannot be cured even by quantum gravity. In this context a black hole remnant conveniently serves as a cosmic censor. We conclude that a remnant remains a possible end state of Hawking evaporation, and if it contains large interior geometry, may help to ameliorate the information loss paradox and the firewall controversy. We hope that this will raise some interests in the community to investigate remnants more critically but also more thoroughly.

Place, publisher, year, edition, pages
2015. Vol. 603, 1-45 p.
Keyword [en]
Black hole remnants, Black hole information paradox, Black hole firewall, Singularity in general relativity and quantum gravity
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-125802DOI: 10.1016/j.physrep.2015.10.007ISI: 000367026300001OAI: diva2:896662
Available from: 2016-01-22 Created: 2016-01-18 Last updated: 2016-01-22Bibliographically approved

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Ong, Yen Ching
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