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Author  |
Benso, C.; Schwetz, T.; Vatsyayan, D. |
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Title |
Large neutrino mass in cosmology and keV sterile neutrino dark matter from a dark sector |
Type |
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 |
04 |
Issue |
4 |
Pages |
054 - 32pp |
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Keywords |
dark matter theory; neutrino masses from cosmology; cosmology of theories beyond the SM; particle physics-cosmology connection |
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Abstract |
We consider an extended seesaw model which generates active neutrino masses via the usual type-I seesaw and leads to a large number of massless fermions as well as a sterile neutrino dark matter (DM) candidate in the O(10-100) keV mass range. The dark sector comes into thermal equilibrium with Standard Model neutrinos after neutrino decoupling and before recombination via a U(1) gauge interaction in the dark sector. This suppresses the abundance of active neutrinos and therefore reconciles sizeable neutrino masses with cosmology. The DM abundance is determined by freeze-out in the dark sector, which allows avoiding bounds from X-ray searches. Our scenario predicts a slight increase in the effective number of neutrino species Neff at recombination, potentially detectable by future CMB missions. |
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Address |
[Benso, Cristina] Karlsruhe Inst Technol KIT, Inst Theoret Particle Phys TTP, D-76128 Karlsruhe, Germany, Email: cristina.benso@kit.edu; |
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Publisher |
IOP Publishing Ltd |
Place of Publication |
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Language |
English |
Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1475-7516 |
ISBN |
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Notes |
WOS:001473924800005 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6629 |
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