TY  - JOUR
AU  - Archidiacono, M.
AU  - Gariazzo, S.
AU  - Giunti, C.
AU  - Hannestad, S.
AU  - Tram, T.
PY  - 2020
DA  - 2020//
TI  - Sterile neutrino self-interactions: H-0 tension and short-baseline anomalies
T2  - J. Cosmol. Astropart. Phys.
JO  - Journal of Cosmology and Astroparticle Physics
SP  - 029
EP  - 20pp
VL  - 12
IS  - 12
PB  - Iop Publishing Ltd
KW  - cosmological neutrinos
KW  - cosmological parameters from CMBR
KW  - particle physics – cosmology connection
KW  - physics of the early universe
AB  - Sterile neutrinos with a mass in the eV range have been invoked as a possible explanation of a variety of short baseline (SBL) neutrino oscillation anomalies. However, if one considers neutrino oscillations between active and sterile neutrinos, such neutrinos would have been fully thermalised in the early universe, and would be therefore in strong conflict with cosmological bounds. In this study we first update cosmological bounds on the mass and energy density of eV-scale sterile neutrinos. We then perform an updated study of a previously proposed model in which the sterile neutrino couples to a new light pseudoscalar degree of freedom. Consistently with previous analyses, we find that the model provides a good fit to all cosmological data and allows the high value of H-0 measured in the local universe to be consistent with measurements of the cosmic microwave background. However, new high l polarisation data constrain the sterile neutrino mass to be less than approximately 1 eV in this scenario. Finally, we combine the cosmological bounds on the pseudoscalar model with a Bayesian inference analysis of SBL data and conclude that only a sterile mass in narrow ranges around 1 eV remains consistent with both cosmology and SBL data.
SN  - 1475-7516
UR  - https://arxiv.org/abs/2006.12885
UR  - https://doi.org/10.1088/1475-7516/2020/12/029
DO  - 10.1088/1475-7516/2020/12/029
LA  - English
N1  - WOS:000609105900015
ID  - Archidiacono_etal2020
ER  -