TY - JOUR
T1 - A reexamination of the cosmological bound to the number of neutrino flavors
AU - Steigman, G.
AU - Olive, K. A.
AU - Schramm, D. N.
AU - Turner, M. S.
PY - 1986/8/21
Y1 - 1986/8/21
N2 - 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 (τ 1 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.
AB - 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 (τ 1 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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U2 - 10.1016/0370-2693(86)90920-2
DO - 10.1016/0370-2693(86)90920-2
M3 - Article
AN - SCOPUS:0002007738
VL - 176
SP - 33
EP - 38
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 1-2
ER -