Neutrino degeneracy and cosmological nucleosynthesis, revisited

Keith A. Olive, David N. Schramm, David Thomas, Terry P. Walker

Research output: Contribution to journalArticle

59 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)239-244
Number of pages6
JournalPhysics Letters B
Volume265
Issue number3-4
DOIs
StatePublished - Aug 15 1991

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