The Increase in the Primordial He-4 Yield in the Two-Doublet Four-Neutrino Mixing Scheme

Abstract

We assess the effects on Big Bang Nucleosynthesis (BBN) of lepton number generation in the early universe resulting from the two-doublet four-neutrino mass/mixing scheme. It has been argued that this neutrino mass/mixing arrangement gives the most viable fit to the existing data. We study full 4 x 4 mixing matrices and show how possible symmetries in these can affect the BBN He-4 abundance yields. Though there is as yet no consensus on the reliability of BBN calculations with neutrino flavor mixing, we show that, in the case where the sign of the lepton number asymmetry is unpredictable, BBN considerations may pick out specific relationships between mixing angles. In particular, reconciling the observed light element abundances with a \barν_μ<-> \barν_e oscillation interpretation of LSND would allow unique new constraints on the neutrino mixing angles in this model.

12 pages, including 4 figures, to appear in Phys. Rev. D

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Cited by in corpus (6)

• Sterile Neutrino Hot, Warm, and Cold Dark Matter
• Sterile neutrinos in cosmology
• Stringent Constraints on Cosmological Neutrino-Antineutrino Asymmetries from Synchronized Flavor Transformation
• Telling Three from Four Neutrinos with Cosmology
• Oscillation Induced Neutrino Asymmetry Growth in the Early Universe
• Big bang nucleosynthesis constraints on bulk neutrinos