Cosmological constraints on neutrino degeneracy

Details Cosmological constraints on neutrino degeneracy Cosmological constraints on neutrino degeneracy

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nuphb.372..494h&link_type=abstract

Nuclear Physics B, Volume 372, Issue 1-2, p. 494-520.

Physics

Nuclear Physics

79

Scientific paper

A large lepton asymmetry may be hidden in degenerate neutrinos. The cosmological consequences of neutrino degeneracy are explored with particular attention to the effects on primordial nucleosynthesis. Degenerate neutrinos will increase the density and expansion rate of the Universe so that cosmological data provides constraints on neutrino degeneracy. Although degenerate big-bang nucleosynthesis (DBBN) has two more free parameters (the electron-neutrino degeneracy and the degeneracy in non-electron-neutrinos) than is available in standard big-bang nucleosynthesis (SBBN), the cosmological constraints restrict the permitted range of these parameters. In particular, we find that a baryon-dominated, critical density Universe (ΩB) = 1 is not permitted. A combination of bounds from DBBN and the density and expansion rate of the Universe constraints the e-neutrino degeneracy (-0.06 <~ξe<~1.1), the μ, τ-neutrino degeneracy (ξμ,τ<~6.9) and, the nucleon-to-photon rati0 (2.8<~η10<~19).

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