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Paper detail

Dark radiation constraints on light primordial black holes

Light black holes could have formed in the very early universe through the collapse of large primordial density fluctuations. These primordial black holes (PBHs), if light enough, would have evaporated by now because of the emission of Hawking radiation; thus they could not represent a sizable fraction of dark matter today. However, they could have left imprints in the early cosmological epochs. We will discuss the impact of massless graviton emission by (rotating) PBHs before the onset of big bang nucleosynthesis (BBN) and conclude that this contribution to dark radiation is constrained by the cosmic microwave background (CMB) (with the future CMB Stage 4) and BBN in the lighter portion of the PBH mass range, under the hypothesis that they dominated the energy density of the universe.

preprint2022arXivOpen access
Jérémy AuffingerAlexandre ArbeyPearl SandickBarmak Shams Es HaghiKuver Sinha
astro-ph.COastro-ph.HEgr-qchep-th
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Jérémy AuffingerAlexandre ArbeyPearl SandickBarmak Shams Es HaghiKuver Sinha

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