Universal Lepton Asymmetry: New Constraints from the Cosmic Microwave Background and Primordial Nucleosynthesis
Abstract
We 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 Ωb 1 can be accommodated within the light-element constraints from primordial nucleosynthesis. This parameter space consists of νμ and ντ degeneracies with a small νe degeneracy. Constraints from cosmic microwave background fluctuations are also discussed (orito00).
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