Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

Cosmological radiation density with non-standard neutrino physics

Jul 9, 2022, 9:00 AM
Room 8 (Blu)

Room 8 (Blu)

Parallel Talk Astroparticle Physics and Cosmology Astroparticle Physics and Cosmology


Sergio Pastor (IFIC, CSIC-Univ Valencia)


Non-standard neutrino properties can modify the picture of neutrino decoupling from the cosmic plasma. We have calculated the impact on the contribution of neutrinos to the cosmological radiation density, parameterized via the effective number of neutrinos ($N_{\rm eff}$), for some particular cases, including the presence of neutrino non-standard interactions (NSI) with electrons or mixing with a fourth, sterile neutrino state. We show the corresponding bounds on these scenarios from present analyses and future measurements of $N_{\rm eff}$. For instance, we find that future cosmological data would provide competitive and complementary constraints on some of the NSI parameters and their combinations (https://doi.org/10.1016/j.physletb.2021.136508)

In-person participation Yes

Primary author

Sergio Pastor (IFIC, CSIC-Univ Valencia)

Presentation materials