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Evolution of primordial black hole spin due to Hawking radiation
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abstract
Near extremal Kerr black holes are subject to the Thorne limit $a<a^*_{\rm lim}=0.998$ 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 black holes 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 black holes with extremely high spin should be a hint of either exotic astrophysical mechanisms or primordial origin.
Forward citations
Cited by 3 Pith papers
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Revisiting PBH accretion, evaporation and their cosmological consequences
Relativistic accretion onto Kerr primordial black holes gives roughly 4.5x mass growth and fast spin-down, strengthening BBN bounds, lowering the survival mass to ~2.7e14 g, and erasing the high-frequency stochastic g...
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Comprehensively Constraining Ultra-Light Primordial Black Holes Through Relic Formation and Early Mergers
Ultra-light primordial black holes that evaporate before Big Bang nucleosynthesis can still be probed through Planck-mass relics and early binary mergers, leaving a narrow window where relics make up all dark matter.
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Refining primordial black hole dark matter constraints with dust heating: the role of spin and halo profile dependence
Dust-heating constraints on PBH dark matter tighten to f_PBH ≈ 10^-4 when PBH spin is included, with the strongest limits for the Isothermal halo profile and weakest for Burkert.
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