Secret neutrino interactions: a pseudoscalar model

Maria Archidiacono, Steen Hannestad, Rasmus Sloth Hansen, Thomas Tram

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Neutrino oscillation experiments point towards the existence of additional mostly sterile neutrino mass eigenstates in the eV mass range. At the same time, such sterile neutrinos are disfavoured by cosmology (Big Bang Nucleosynthesis, Cosmic Microwave Background and Large Scale Structure), unless they can be prevented from being thermalised in the early Universe. To this aim, we introduce a model of sterile neutrino secret interactions mediated by a new light pseudoscalar: The new interactions can accomodate sterile neutrinos in the early Universe, providing a good fit to all the up to date cosmological data.

Original languageEnglish
Article number032002
JournalJournal of Physics: Conference Series
Issue number3
Publication statusPublished - 9 Jun 2016
EventXIV International Conference on Topics in Astroparticle and Underground Physics - Torino, Italy
Duration: 7 Sept 201511 Sept 2015


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