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arXiv · 2305.13369

Limits on light primordial black holes from high-scale leptogenesis

Roberta Calabrese·Marco Chianese·Jacob Gunn·Gennaro Miele·Stefano Morisi·Ninetta Saviano
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Abstract

We investigate the role that the evaporation of light primordial black holes may have played in the production of the baryon asymmetry of the Universe through the high-scale leptogenesis. In particular, for mass of primordial black hole in the range [$10^6$-$10^9$] g, we find a dilution of thermally generated lepton asymmetry via entropy injection in the primordial plasma after the sphaleron freeze-out. As a consequence, we can put strong constraints on the primordial black hole parameters, showing the mutual exclusion limits between primordial black holes and high-scale leptogenesis. Remarkably, we point out an interplay between the upper bound on the initial abundance of primordial black holes and the active neutrino mass scale.

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Roberta Calabrese, Marco Chianese, Jacob Gunn, Gennaro Miele, Stefano Morisi, Ninetta Saviano. 2023-05-22. Limits on light primordial black holes from high-scale leptogenesis. https://doi.org/10.1103/physrevd.107.123537

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