Is an 11eV sterile neutrino consistent with clusters, the cosmic microwave background and modified Newtonian dynamics?
In this paper, we show that if a single sterile neutrino exists such that , it can serendipitously solve all outstanding issues of the Modified Newtonian Dynamics. We focus on fitting the angular power spectrum of the cosmic microwave background (CMB) in detail which is possible using a flat Universe with and the usual baryonic and dark energy components. One cannot match the CMB if there is more than one massive sterile neutrino, nor with three active neutrinos of 2eV. This model has the same expansion history as the Λ cold dark matter (ΛCDM) model and only differs at the galactic scale, where the modified dynamics outperform ΛCDM comprehensively. We discuss how an 11eV sterile neutrino can explain the dark matter of galaxy clusters without influencing individual galaxies and potentially match the matter power spectrum.