Primordial nucleosynthesis & neutrinos with mass and degeneracy

We reanalyze primordial nucleosynthesis in the presence of a net lepton asy mmetry. We show that a previously unnoted region of the parameter space exi sts in which very large baryon densities 0.1 less than or equal to Omega (b ) less than or equal to 1 can be accommodated within the light-element cons traints assuming that some destruction of primordial lithium has occurred, this parameter space consists of large v(mu), v(tau) degeneracies together with a moderate v, degeneracy. Constraints on this parameter space from non -big-bang considerations, such as Cosmic Background Radiation measurements, are also discussed [1].