Sterile neutrinos with pseudoscalar self-interactions and cosmology

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

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Abstract

Sterile neutrinos in the electronvolt mass range are hinted at by a number of terrestrial neutrino experiments. However, such neutrinos are highly incompatible with data from the cosmic microwave background and large scale structure. This paper discusses how charging sterile neutrinos under a new pseudoscalar interaction can reconcile eV sterile neutrinos with cosmological data. We show that this model provides a fit to all available data which is way better than the standard Λ cold dark matter model with one additional fully thermalized sterile neutrino. In particular it also prefers a value of the Hubble parameter much closer to the locally measured value.
Original languageEnglish
Article number045004
JournalPhysical Review D
Volume93
Issue number4
DOIs
Publication statusPublished - 4 Feb 2016

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