Limits on neutrino degeneracy from early nucleosynthesis

Details Limits on neutrino degeneracy from early nucleosynthesis Limits on neutrino degeneracy from early nucleosynthesis

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980stin...8225041s&link_type=abstract

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Astronomy and Astrophysics

Astrophysics

Degeneration, Neutrinos, Nuclear Fusion, Astronomical Models, Astrophysics, Helium, Hydrogen

Scientific paper

The abundances of (4)He and (2)H are calculated in terms of the baryon density and neutrino degeneration, under the assumption, that the present dynamical properties of the Universe are determined by neutrinos, as it is suggested by recent measurements. It is shown that only a limited range of these parameters gives the abundances in agreement with observations. This provides a limit on both rho(B), the baryon density of the Universe, and xi, the neutrino degeneration parameter. These limits are 2.10(+31) g/cm(3) rho(b) 3.10(+3)0 g/cm(3); -0.2xi0.05 which are in agreement with the observed amount of visible matter, rho*=3.10(+3) g/cm(3), and the value xi=10(+9), expected from SU(5) Grand Unification.

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