Evolution of primordial black hole spin due to Hawking radiation

被引:40
作者
Arbey, Alexandre [1 ,6 ]
Auffinger, Jeremy [1 ,2 ,3 ]
Silk, Joseph [2 ,4 ,5 ]
机构
[1] Univ Claude Bernard Lyon 1, Univ Lyon, IP2I Lyon, CNRS,IN2P3,UMR 5822, F-69622 Villeurbanne, France
[2] Sorbonne Univ, Inst Astrophys Paris, UMR 7095, CNRS, 98 Bis,Blvd Arago, F-75014 Paris, France
[3] Ecole Normale Super Lyon, Dept Phys, F-69342 Lyon, France
[4] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[5] Univ Oxford, Beecroft Inst Particle Astrophys & Cosmol, Oxford OX1 3RH, England
[6] Inst Univ France, 103 Blvd St Michel, F-75005 Paris, France
关键词
black hole physics; cosmology: theory; PARTICLE-EMISSION RATES; PERTURBATIONS; EQUATIONS;
D O I
10.1093/mnras/staa765
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Near extremal Kerr black holes (BHs) are subject to the Thorne limit a < a(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.
引用
收藏
页码:1257 / 1262
页数:6
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