PoS - Proceedings of Science
Volume 414 - 41st International Conference on High Energy physics (ICHEP2022) - Astroparticle Physics and Cosmology
Cosmological radiation density with non-standard neutrino physics
S. Pastor
Full text: pdf
Pre-published on: November 03, 2022
Published on: June 15, 2023
Many extended models of particle physics that explain non-zero neutrino mases also include non-standard interactions (NSI) of
these elusive particles with other fermions. The NSIs that modify the collisions between neutrinos and electrons have an impact on the process of
neutrino decoupling in the early universe, leading to a different contribution to the radiation energy density, parameterised by the effective number of neutrinos, $N_{\rm eff}$. We have performed an analysis of the influence of non-universal and flavour-changing NSI on $N_{\rm eff}$, both for one-parameter and multi-parameter choices. In comparison with current constraints from terrestrial experiments, cosmology is less sensitive to NSI parameters, but future cosmological observations could provide competitive and complementary bounds for some combinations of NSI couplings.
DOI: https://doi.org/10.22323/1.414.0075
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