Abstract
It is suggested that Goldstone bosons may be masquerading as fractional cosmic neutrinos, contributing about 0.39 to what is reported as the effective number of neutrino types in the era before recombination. The broken symmetry associated with these Goldstone bosons is further speculated to be the conservation of the particles of dark matter.
- Received 8 April 2013
DOI:https://doi.org/10.1103/PhysRevLett.110.241301
© 2013 American Physical Society
