Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..242..141f&link_type=abstract
Strong, weak, and electromagnetic interactions in nuclei, atoms, and astrophysics. AIP Conference Proceedings, Volume 242, pp.
Astronomy and Astrophysics
Astrophysics
Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, Supernovae
Scientific paper
The implications of the Z0-width experiment for the number of neutrino flavors taken together with the 4He constraint on the energy density at the nucleosynthesis epoch, can give a limit on the extent to which a right-handed neutrino sea could contribute to the expansion rate of the universe during Big Bang nucleosynthesis. Since the population of the right-handed neutrino sea depends on the neutrino mass we can extract a Dirac neutrino mass limit of mν<<400 keV. This limit could apply to νμ or ντ if they have purely Dirac masses. Similarly neutrino-nucleon scattering, nucleon-neutrino-pair- bremsstrahlung, and deexcitation of hot nuclei into neutrino pairs are all possible sources of sterile neutrinos in supernovae. The demand that sterile neutrino production not produce too much cooling leads to another limit on Dirac neutrino masses. This limit may be in a range low enough to have some leverage on recently discussed 17 keV neutrinos.
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