Leptonic numbers and the neutron to proton ratio in the hot big bang model

Details Leptonic numbers and the neutron to proton ratio in the hot big bang model Leptonic numbers and the neutron to proton ratio in the hot big bang model

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....49..415b&link_type=abstract

Astronomy and Astrophysics, vol. 49, no. 3, June 1976, p. 415-419. Research supported by the United States-Israel Binational Sc

Astronomy and Astrophysics

Astrophysics

31

Astronomical Models, Big Bang Cosmology, Density (Number/Volume), Helium Isotopes, Leptons, Temperature Effects, Abundance, Neutrons, Nuclear Fusion, Protons, Ratios

Scientific paper

The neutron-to-proton (n/p) ratio before nucleosynthesis in a hot big-bang model is calculated as a function of temperature for nonzero electron and muon leptonic numbers or, equivalently, for nonzero neutrino degeneracy parameters. A Lemaitre-Friedmann universe is assumed, and the effect of nonzero leptonic numbers on the temperature dependence of the n/p ratio is considered. The results are used to estimate the primeval yield of He-4 and to set limits on the leptonic numbers.

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