Universal Lepton Asymmetry: New Constraints from the Cosmic Microwave Background and Primordial Nucleosynthesis

Details Universal Lepton Asymmetry: New Constraints from the Cosmic Microwave Background and Primordial Nucleosynthesis Universal Lepton Asymmetry: New Constraints from the Cosmic Microwave Background and Primordial Nucleosynthesis

2002-02-06

arxiv.org/abs/astro-ph/0202114v1

Astronomy and Astrophysics

Astrophysics

Proceedings of COSMO-01, Rovaniemi, Finland, August 29 -- September 4, 2001

Scientific paper

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 $0.1 \le \Omega_b \le 1$ can be accommodated within the light-element constraints from primordial nucleosynthesis. This parameter space consists of $\nu_\mu$ and $\nu_\tau$ degeneracies with a small $\nu_e$ degeneracy. Constraints from cosmic microwave background fluctuations are also discussed (orito00).

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