Neutrino degeneracy and cosmological nucleosynthesis, revisited

Details Neutrino degeneracy and cosmological nucleosynthesis, revisited Neutrino degeneracy and cosmological nucleosynthesis, revisited

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9129110o&link_type=abstract

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Computer Science

Big Bang Cosmology, Leptons, Neutrinos, Nuclear Fusion, Photon Density, Photons, Reaction Kinetics

Scientific paper

A reexamination of the effects of non-zero degeneracies on Big Bang Nucleosynthesis is made. As previously noted, non-trivial alterations of the standard model conclusions can be induced only if excess lepton numbers Li, comparable to photon number densities etatau, are assumed (where etatau is approx. 3 times 109 etab). Furthermore, the required lepton number densities (Li etatau) must be different for upsilone than for upsilonmu and epsilontau. It is shown that this loophole in the standard model of nucleosynthesis is robust and will not vanish as abundance and reaction rate determinations improve. However, it is also argued that theoretically (Le) approx. (Lmu) approx. (Ltau) approx. etab is much less than etatau which would preclude this loophole in standard unified models.

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