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Author  |
Sanchis, H.; Barenboim, G.; Perez-Gonzalez, Y.F. |
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Title |
Neutrino emission and plasma heating from primordial black holes: an improved approach to Neff constraints |
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Journal Article |
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Year |
2025 |
Publication |
Journal of Cosmology and Astroparticle Physics |
Abbreviated Journal |
J. Cosmol. Astropart. Phys. |
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Volume |
08 |
Issue |
8 |
Pages |
049 - 29pp |
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Keywords |
cosmological neutrinos; primordial black holes; physics of the early universe; neutrino properties |
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Abstract |
We investigate the impact of neutrino emission via Hawking radiation from primordial black holes (PBHs) on the cosmological effective number of neutrino species, Neff, after neutrino decoupling. By comparing this effect with observational limits, we derive bounds on the abundance of light PBHs. Our analysis incorporates two previously unaccounted-for effects: the emission of secondary neutrinos from unstable particles, which increases Neff, and the modification of the neutrino-photon temperature ratio due to particle emission heating the photon plasma, which lowers Neff. Overall, including these effects allows us to impose constraints on PBHs with initial masses in the range 109 g <= Mini <= 1013 g. However, our limits remain less stringent than those derived from Big Bang Nucleosynthesis. |
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Address |
[Sanchis, Hector; Barenboim, Gabriela] Univ Valencia, CSIC, Dept Fis Teor, E-46100 Burjassot, Spain, Email: hector.sanchis@uv.es; |
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Publisher |
IOP Publishing Ltd |
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Language |
English |
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Original Title |
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Series Volume |
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Edition |
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ISSN |
1475-7516 |
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Notes |
WOS:001553678200003 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
no |
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Call Number |
IFIC @ pastor @ |
Serial |
6811 |
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