A reexamination of the cosmological bound to the number of neutrino flavors

Details A reexamination of the cosmological bound to the number of neutrino flavors A reexamination of the cosmological bound to the number of neutrino flavors

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phlb..176...33s&link_type=abstract

Physics Letters B, Volume 176, Issue 1-2, p. 33-38.

Physics

77

Scientific paper

The predictions of the light element abundances produced primordially in the standard hot big bang cosmological model with three species of light neutrinos (Nν=3) is consistent with current observational data. If additional species of light neutrinos exist, additional 4He is produced primordially; consistency with observations of 4He leads to an upper bound to Nν which depends on the neutron half-life (τ1/2), the nucleon-to-photon ratio (or, equivalently, the primordial abundances of deuterium and helium-3) and the primordial mass fraction of 4He (Yp). The bounds to these quantities are reexamined and Nν<=4.0 is reconfirmed.

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