Neutrino degeneracy and cosmological nucleosynthesis, revisited

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

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phlb..265..239o&link_type=abstract

Physics Letters B, Volume 265, Issue 3-4, p. 239-244.

Physics

47

Scientific paper

A reexamination of the effects of non-zero neutrino degeneracies on big bang nucleosynthesis is made. As previously noted, non-trivial alterations of the standard model conclusions can only be induced if excess lepton numbers Li, comparable to photon number densities nγ, are assumed (where nγ~3×109nb). Furthermore, the required lepton number densities (Linγ) must be different for νe than for νμ and ντ. 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 ~ Lμ ~ Lτ ~ nb << nγ which would preclude this loophole in standard unified models.

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