Modified Baryonic Dynamics: two-component cosmological simulations with
  light sterile neutrinos
  In this article we continue to test cosmological models centred on Modified
Newtonian Dynamics (MOND) with light sterile neutrinos, which could in
principle be a way to solve the fine-tuning problems of the standard model on
galaxy scales while preserving successful predictions on larger scales. Due to
previous failures of the simple MOND cosmological model, here we test a
speculative model where the modified gravitational field is produced only by
the baryons and the sterile neutrinos produce a purely Newtonian field (hence
Modified Baryonic Dynamics). We use two component cosmological simulations to
separate the baryonic N-body particles from the sterile neutrino ones. The
premise is to attenuate the over-production of massive galaxy cluster halos
which were prevalent in the original MOND plus light sterile neutrinos
scenario. Theoretical issues with such a formulation notwithstanding, the
Modified Baryonic Dynamics model fails to produce the correct amplitude for the
galaxy cluster mass function for any reasonable value of the primordial power
spectrum normalisation.
