Nucleosynthesis bounds on small Dirac neutrino masses due to chiral symmetry breaking

Details Nucleosynthesis bounds on small Dirac neutrino masses due to chiral symmetry breaking Nucleosynthesis bounds on small Dirac neutrino masses due to chiral symmetry breaking

1996-10-10

arxiv.org/abs/hep-ph/9610324v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex 18 pages, 3 figures. Additional discussion of nucleosynthesis. No change in conclusions

Scientific paper

We consider nucleosynthesis constraints on models which use chiral symmetry breaking as a basis for understanding very small Dirac neutrino masses. We show that present big-bang nucleosynthesis constraints impose a well-defined upper bound of 0.1eV on the neutrino masses. This bound may become several orders of magnitude more stringent in the future as our understanding of the observational constraints on nucleosynthesis improves. We discuss the phenomenological implications for neutrino dark matter, the solar neutrino problem and the atmospheric neutrino deficit.

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