Limits on the neutrino number and baryon density of a realistic universe

Details Limits on the neutrino number and baryon density of a realistic universe Limits on the neutrino number and baryon density of a realistic universe

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.203..393b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 203, Apr. 1983, p. 393-401.

Astronomy and Astrophysics

Astronomy

22

Baryons, Cosmology, Neutrinos, Nuclear Fusion, Particle Density (Concentration), Universe, Abundance, Deuterium, Helium, Inhomogeneity, Space Density

Scientific paper

The authors calculate the yield of helium-4 and deuterium from primordial nucleosynthesis in a universe possessing a realistic baryon inhomogeneity at the nucleosynthesis epoch. Using observational ranges of 0.22-0.25 for the helium mass function and 2×10-4-2×10-5 for deuterium they show that no more than three light, stable neutrinos can be accommodated regardless of the inhomogeneity. Tight limits are placed on the allowed ranges of the present baryon density, entropy per baryon and primordial baryon inhomogeneity in universes containing two and three light neutrino species.

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