Physics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aipc...81..548s&link_type=abstract
AIP Conference Proceedings, Volume 81, pp. 548-571 (1982).
Physics
Origin And Formation Of The Universe, Origin, Formation, And Abundances Of The Elements, Elementary Particle Processes
Scientific paper
Constraints on cosmology and on neutrino physics are provided by the abundances of the light elements produced during the early evolution of the universe. The predictions of primordial nucleosynthesis depend on the nucleon to photon ratio ɛ and on the number of types of two component neutrinos Nν. A comparison between the big bang predictions and the observed abundances of D, 3He, 4He and 7Li shows that ɛ is constrained to a narrow range around 4×10-10 and Nν<~4. An important consequence of the derived value of ɛ is that the universal density of nucleon is small, raising the possibility that our Universe may be dominated by massive relic neutrinos. The constraint on Nn suggests that (almost) all lepton species are now known.
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