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Journal Article

Pseudoscalar - sterile neutrino interactions: reconciling the cosmos with neutrino oscillations


Hansen,  Rasmus
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Archidiacono, M., Gariazzo, S., Giunti, C., Hannestad, S., Hansen, R., Laveder, M., et al. (2016). Pseudoscalar - sterile neutrino interactions: reconciling the cosmos with neutrino oscillations. Journal of Cosmology and Astroparticle Physics, 2016: 067. doi:10.1088/1475-7516/2016/08/067.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002B-9D13-4
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.