Sterile neutrinos with pseudoscalar self-interactions and cosmology
  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. In particular it also prefers a value of the Hubble parameter much
closer to the locally measured value.
