Reconciling sterile neutrinos with big bang nucleosynthesis

Details Reconciling sterile neutrinos with big bang nucleosynthesis Reconciling sterile neutrinos with big bang nucleosynthesis

1995-08-10

arxiv.org/abs/hep-ph/9508275v2

Phys.Rev.Lett. 75 (1995) 4350

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, LaTeX, no figures, several minor changes have been made, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.75.4350

We re-examine the big bang nucleosynthesis (BBN) bounds on the mixing of neutrinos with sterile species. These bounds depend on the assumption that the relic neutrino asymmetry $L_{\nu}$ is very small. We show that for $L_{\nu}$ large enough (greater than about $10^{-5}$) the standard BBN bounds do not apply. We apply this result to the sterile neutrino solution to the atmospheric neutrino anomaly and show that for $L_{\nu} > 7 \times 10^{-5}$ it is consistent with BBN. The BBN bounds on sterile neutrinos mixing with electron neutrinos can also be weakened considerably.

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