Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..697y&link_type=abstract
Astrophysical Journal, Part 1, vol. 227, Feb. 1, 1979, p. 697-704.
Astronomy and Astrophysics
Astrophysics
141
Abundance, Astronomical Models, Big Bang Cosmology, Neutrinos, Nuclear Fusion, Gravitational Constant, Helium, Light Elements, Nucleons
Scientific paper
Calculations of primordial nucleosynthesis are performed and used to study the dependence of the predicted abundances on the number of neutrino flavors and the time variation of the gravitational constant. Constraints on the primordial abundance of He-4 are reviewed, and it is suggested that this abundance, Y, is not greater than about 0.25. Severe constraints are placed on the number of lepton flavors (i.e., the number of types of light two-component neutrino), the present nucleon density, and the time variation of the gravitational constant. Primordial abundances of D, He-3, He-4, and Li-7 are computed for several values of lepton number over a range of nucleon densities. The results are compared with the observed abundances of D and Li-7. It is concluded that the universe cannot be closed by nucleons.
Rood Robert T.
Schramm David N.
Steigman Gary
Yang Jaek-Jin
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