Neutrinoless universe

Abstract

The consequences for the relic neutrino abundance, if extra neutrino interactions are allowed, were analyzed. It was observed that the relic neutrinos would annihilate to bosons for a wide range of couplings not excluded by other considerations. It was found that the φ boson could be brought into thermal equilibrium through its coupling to the neutrinos. It was also found that the epoch of matter denomination is delayed in the interacting neutrino scenario which leads to a small suppression of the matter power spectrum on small scales.