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2015

Sterile neutrinos with pseudoscalar self-interactions and cosmology

Archidiacono, Maria, Hannestad, Steen, Hansen, Rasmus Sloth et al.

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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 terrestrial neutrino data.
We show that this model can reconcile eV sterile neutrinos in cosmology, providing a fit to all available data which is way better than the standard $\Lambda$CDM model with one additional fully thermalized sterile neutrino.

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