https://doi.org/10.1140/epjc/s10052-024-12689-7
Letter
How many dark neutrino sectors does cosmology allow?
1
Technical University Munich (TUM), James-Franck-Strasse 1, 85748, Garching, Germany
2
Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, 80805, Munich, Germany
Received:
6
October
2023
Accepted:
17
March
2024
Published online:
29
March
2024
We present the very first constraints on the number of Standard Model (SM) copies with an additional Dirac right-handed neutrino. From cosmology, we are able to pose strong limits on large regions of the parameter space. Moreover, we show that it is possible to account for the right dark matter density in form of stable particles from the dark sectors.
© The Author(s) 2024
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