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Evolution of primordial black hole spin due to Hawking radiation
ABSTRACT Near extremal Kerr black holes (BHs) are subject to the Thorne limit $a\lt a^*_{\rm lim}=0.998$ in the case of thin disc accretion, or some generalized version of this in other disc geometries. However, any limit that differs from the thermodynamics limit a* < 1 can in principle be evade...
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Published in: | Monthly notices of the Royal Astronomical Society 2020-05, Vol.494 (1), p.1257-1262 |
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container_title | Monthly notices of the Royal Astronomical Society |
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creator | Arbey, Alexandre Auffinger, Jérémy Silk, Joseph |
description | ABSTRACT
Near extremal Kerr black holes (BHs) are subject to the Thorne limit $a\lt a^*_{\rm lim}=0.998$ in the case of thin disc accretion, or some generalized version of this in other disc geometries. However, any limit that differs from the thermodynamics limit a* < 1 can in principle be evaded in other astrophysical configurations, and in particular if the near extremal BHs are primordial and subject to evaporation by Hawking radiation only. We derive the lower mass limit above which Hawking radiation is slow enough so that a primordial black hole with a spin initially above some generalized Thorne limit can still be above this limit today. Thus, we point out that the observation of Kerr BHs with extremely high spin should be a hint of either exotic astrophysical mechanisms or primordial origin. |
doi_str_mv | 10.1093/mnras/staa765 |
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Near extremal Kerr black holes (BHs) are subject to the Thorne limit $a\lt a^*_{\rm lim}=0.998$ in the case of thin disc accretion, or some generalized version of this in other disc geometries. However, any limit that differs from the thermodynamics limit a* < 1 can in principle be evaded in other astrophysical configurations, and in particular if the near extremal BHs are primordial and subject to evaporation by Hawking radiation only. We derive the lower mass limit above which Hawking radiation is slow enough so that a primordial black hole with a spin initially above some generalized Thorne limit can still be above this limit today. Thus, we point out that the observation of Kerr BHs with extremely high spin should be a hint of either exotic astrophysical mechanisms or primordial origin.</description><identifier>ISSN: 0035-8711</identifier><identifier>EISSN: 1365-2966</identifier><identifier>DOI: 10.1093/mnras/staa765</identifier><language>eng</language><publisher>Oxford University Press</publisher><subject>Astrophysics ; General Relativity and Quantum Cosmology ; Physics</subject><ispartof>Monthly notices of the Royal Astronomical Society, 2020-05, Vol.494 (1), p.1257-1262</ispartof><rights>2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society 2020</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c445t-91588d9691494a0d80abfedbcd302954ee3601bb1b96c506d38c74efc7175c513</citedby><cites>FETCH-LOGICAL-c445t-91588d9691494a0d80abfedbcd302954ee3601bb1b96c506d38c74efc7175c513</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,885,1604,27924,27925</link.rule.ids><linktorsrc>$$Uhttps://dx.doi.org/10.1093/mnras/staa765$$EView_record_in_Oxford_University_Press$$FView_record_in_$$GOxford_University_Press</linktorsrc><backlink>$$Uhttps://hal.science/hal-02165581$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Arbey, Alexandre</creatorcontrib><creatorcontrib>Auffinger, Jérémy</creatorcontrib><creatorcontrib>Silk, Joseph</creatorcontrib><title>Evolution of primordial black hole spin due to Hawking radiation</title><title>Monthly notices of the Royal Astronomical Society</title><description>ABSTRACT
Near extremal Kerr black holes (BHs) are subject to the Thorne limit $a\lt a^*_{\rm lim}=0.998$ in the case of thin disc accretion, or some generalized version of this in other disc geometries. However, any limit that differs from the thermodynamics limit a* < 1 can in principle be evaded in other astrophysical configurations, and in particular if the near extremal BHs are primordial and subject to evaporation by Hawking radiation only. We derive the lower mass limit above which Hawking radiation is slow enough so that a primordial black hole with a spin initially above some generalized Thorne limit can still be above this limit today. Thus, we point out that the observation of Kerr BHs with extremely high spin should be a hint of either exotic astrophysical mechanisms or primordial origin.</description><subject>Astrophysics</subject><subject>General Relativity and Quantum Cosmology</subject><subject>Physics</subject><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNqF0D1PwzAQBmALgUQpjOweYQi9iz8Sb1RVoUiVWGC2HNuhoWlc2WkR_56GVqxMJ52e93R6CblFeEBQbLLpokmT1BtTSHFGRsikyHIl5TkZATCRlQXiJblK6RMAOMvliDzO96Hd9U3oaKjpNjabEF1jWlq1xq7pKrSepm3TUbfztA90Yb7WTfdBozmoIXZNLmrTJn9zmmPy_jR_my2y5evzy2y6zCznos8UirJ0SirkihtwJZiq9q6yjkGuBPeeScCqwkpJK0A6VtqC-9oWWAgrkI3J_fHuyrR6-NPEbx1MoxfTpR52kKMUosT9YLOjtTGkFH39F0DQQ1X6typ9qurg744-7Lb_0B_ZNmu0</recordid><startdate>20200501</startdate><enddate>20200501</enddate><creator>Arbey, Alexandre</creator><creator>Auffinger, Jérémy</creator><creator>Silk, Joseph</creator><general>Oxford University Press</general><general>Oxford University Press (OUP): Policy P - Oxford Open Option A</general><scope>AAYXX</scope><scope>CITATION</scope><scope>1XC</scope><scope>VOOES</scope></search><sort><creationdate>20200501</creationdate><title>Evolution of primordial black hole spin due to Hawking radiation</title><author>Arbey, Alexandre ; Auffinger, Jérémy ; Silk, Joseph</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c445t-91588d9691494a0d80abfedbcd302954ee3601bb1b96c506d38c74efc7175c513</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Astrophysics</topic><topic>General Relativity and Quantum Cosmology</topic><topic>Physics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Arbey, Alexandre</creatorcontrib><creatorcontrib>Auffinger, Jérémy</creatorcontrib><creatorcontrib>Silk, Joseph</creatorcontrib><collection>CrossRef</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Arbey, Alexandre</au><au>Auffinger, Jérémy</au><au>Silk, Joseph</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Evolution of primordial black hole spin due to Hawking radiation</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><date>2020-05-01</date><risdate>2020</risdate><volume>494</volume><issue>1</issue><spage>1257</spage><epage>1262</epage><pages>1257-1262</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><abstract>ABSTRACT
Near extremal Kerr black holes (BHs) are subject to the Thorne limit $a\lt a^*_{\rm lim}=0.998$ in the case of thin disc accretion, or some generalized version of this in other disc geometries. However, any limit that differs from the thermodynamics limit a* < 1 can in principle be evaded in other astrophysical configurations, and in particular if the near extremal BHs are primordial and subject to evaporation by Hawking radiation only. We derive the lower mass limit above which Hawking radiation is slow enough so that a primordial black hole with a spin initially above some generalized Thorne limit can still be above this limit today. Thus, we point out that the observation of Kerr BHs with extremely high spin should be a hint of either exotic astrophysical mechanisms or primordial origin.</abstract><pub>Oxford University Press</pub><doi>10.1093/mnras/staa765</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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title | Evolution of primordial black hole spin due to Hawking radiation |
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