2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/4127We study the primordial nucleosynthesis and cosmic age in the presence of a net lepton asymmetry as well as baryon asymmetry. We explore a previously unnoted region of the parameter space in which very large baryon densities $0.1 \le Ω_b \le 1$ can be accommodated within the light-element constraints from primordial nucleosynthesis. This parameter space consists of $ν_μ$ and $ν_τ$ degeneracies with a small $ν_e$ degeneracy. Constraints from cosmic microwave background fluctuations are also discussed (orito00).Proceedings of COSMO-01, Rovaniemi, Finland, August 29 -- September 4, 2001Astrophysicstext