Mass Spectrum Of Small Primordial Black Holes

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arXiv.org > astro-ph > arXiv:2109.02446


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Astrophysics > Cosmology and Nongalactic Astrophysics


Submission history From: Alexander Kirillov [ view email ]
[v1]
Mon, 6 Sep 2021 13:17:56 UTC (1,074 KB)


astro-ph


gr-qc


hep-th





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Cosmology and Nongalactic Astrophysics (astro-ph.CO) ; General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
(or
arXiv:2109.02446v1 [astro-ph.CO] for this version)



This paper examines the mass spectrum of primordial black holes that should result if the early universe consisted of small density fluctuations superposed on a Friedmann background. It is shown that only a certain type of fluctuation favors the formation of primordial black holes and that, consequently, their spectrum should always have a particular form. Since both the fluctuations which arise naturally and the fluctuations which are often invoked to explain galaxy formation are of the required type, primordial black holes could have had an important effect on the evolution of the universe. Although primordial black holes are unlikely to have a critical density, big ones could have been sufficiently numerous to act as condensation nuclei for galaxies. Observational limits on the spectrum of primordial black holes place strong constraints on the magnitude of density fluctuations in the early universe and support the assumption that the early universe was nearly Friedmann rather than chaotic. Any model in which the early universe has a soft equation of state for a prolonged period is shown to be suspect, since primordial black holes probably form too prolifically in such a situation to be consistent with observation.


The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative
Agreement NNX16AC86A


https://arxiv.org/abs/2109.02446
https://ui.adsabs.harvard.edu/abs/1975ApJ...201....1C/abstract
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