Other
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..478..448f&link_type=abstract
Second international workshop on particle physics and the early universe (COSMO-98). AIP Conference Proceedings, Volume 478, pp
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1
Neutrino Mass And Mixing, Dark Matter, Big Bang Nucleosynthesis, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments
Scientific paper
The existence of small mixings between light active and sterile neutrino species could have implications for Big Bang and Supernova Heavy Element Nucleosynthesis. As well, such mixing would force us to abandon cherished constraints on light neutrino Dark Matter. Two proposed 4-neutrino mass and mixing schemes, for example, can both accomodate existing experimental results and lead to elegant solutions to the neutron-deficit problem for r-Process nucleosynthesis from neutrino-heated supernova ejecta. Each of these solutions is based on matter-enhanced (MSW) active-sterile neutrino transformation. In plausible extensions of these schemes to the early universe, Shi & Fuller have shown that relatively light mass (~200 eV to ~10 keV) sterile neutrinos produced via active-sterile MSW conversion can have a ``cold'' energy spectrum. Neutrinos produced in this way circumvent the principal problem of light neutrino dark matter and would be, essentially, Cold Dark Matter.
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