Abstract
Early-Universe decay of 17 keV neutrinos is likely to happen in equilibrium for lifetime < sec. For 3×<<1× sec the primordial mass fraction may be reduced by up to 0.028 relative to the standard model. Bosons from the decay can form a Bose condensate, with interesting consequences for galaxy formation and the dark-matter problem. The effects are generic to early-Universe decay of fermions, not just of relevance for 17 keV neutrinos.
- Received 7 April 1992
DOI:https://doi.org/10.1103/PhysRevLett.69.571
©1992 American Physical Society