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

G. Steigman; K. A. Olive; D. N. Schramm; M. S. Turner

doi:10.1016/0370-2693(86)90920-2

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

G. Steigman, K. A. Olive, D. N. Schramm, M. S. Turner

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

82 Scopus citations

Abstract

The predictions of the light element abundances produced primordially in the standard hot big bang cosmological model with three species of light neutrinos (N_ν=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 N_ν 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 (Y_p). The bounds to these quantities are reexamined and N_ν≤4.0 is reconfirmed.

Original language	English (US)
Pages (from-to)	33-38
Number of pages	6
Journal	Physics Letters B
Volume	176
Issue number	1-2
DOIs	https://doi.org/10.1016/0370-2693(86)90920-2
State	Published - Aug 21 1986

Bibliographical note

Funding Information:
NSF and the DOE and, at Fermilab their research is supported by NASA.

Funding Information:
The research of Gary Steigman is supported at Bartol by the DOE (DE-AC02-78ER-05007), that of K.A.O. is supported at Minnesota also by the DOE (DE-AC02-83ER-40105), at Chicago the research of D.N.S. and M.S.T. is supported by the

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title = "A reexamination of the cosmological bound to the number of neutrino flavors",

abstract = "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.",

author = "G. Steigman and Olive, {K. A.} and Schramm, {D. N.} and Turner, {M. S.}",

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doi = "10.1016/0370-2693(86)90920-2",

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AU - Steigman, G.

AU - Olive, K. A.

AU - Schramm, D. N.

AU - Turner, M. S.

N1 - Funding Information: NSF and the DOE and, at Fermilab their research is supported by NASA. Funding Information: The research of Gary Steigman is supported at Bartol by the DOE (DE-AC02-78ER-05007), that of K.A.O. is supported at Minnesota also by the DOE (DE-AC02-83ER-40105), at Chicago the research of D.N.S. and M.S.T. is supported by the

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

Abstract

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