How degenerate can cosmological neutrinos be?

Abstract

There are well-known bounds on light neutrino masses from cosmological energy density arguments. These arguments assume the neutrinos to be non-degenerate. We show how these bounds are affected if the neutrinos are degenerate. In this case, we obtain correlated bounds between neutrino mass and degeneracy.

Comments: 5 pages, Latex, uses epsf.sty. (Some details added at the referee's request. One reference added.)