Pseudoscalar—sterile neutrino interactions: reconciling the cosmos with neutrino oscillations
- Institute for Theoretical Particle Physics and Cosmology (TTK), RWTH Aachen University, D-52056 Aachen (Germany)
- Department of Physics, University of Torino, Via P. Giuria 1, I–10125 Torino (Italy)
- INFN, Sezione di Torino, Via P. Giuria 1, I–10125 Torino (Italy)
- Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C (Denmark)
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg (Germany)
- Dipartimento di Fisica e Astronomia ''G. Galilei'', Università di Padova, and INFN, Sezione di Padova, Via F. Marzolo 8, I–35131 Padova (Italy)
- Institute of Gravitation and Cosmology, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth, PO1 3FX (United Kingdom)
The Short BaseLine (SBL) neutrino oscillation anomalies hint at the presence of a sterile neutrino with a mass of around 1 eV. However, such a neutrino is incompatible with cosmological data, in particular observations of the Cosmic Microwave Background (CMB) anisotropies. However, this conclusion can change by invoking new physics. One possibility is to introduce a secret interaction in the sterile neutrino sector mediated by a light pseudoscalar. In this pseudoscalar model, CMB data prefer a sterile neutrino mass that is fully compatible with the mass ranges suggested by SBL anomalies. In addition, this model predicts a value of the Hubble parameter which is completely consistent with local measurements.
- OSTI ID:
- 22679484
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 08; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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