1999/08/31 by Kevork N. Abazajian, Kevork Abazajian, George M. Fuller +1
Physics and Astronomy · #Astrophysics #Astrophysics and Cosmic Phenomena #Lepton #Mixing (physics) #Neutrino #Neutrino Physics Research #Nuclear physics #Nucleosynthesis #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #Stars #astro-ph #hep-ph
paper · pdf · doi:10.1103/physrevd.62.093003
published as Phys.Rev. D62 (2000) 093003 · 12 pages, including 4 figures, to appear in Phys. Rev. D
arxiv created 2000/08/10 · openalex publication_date 2000/09/25 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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\ifmmode×\else\texttimes\fi4 mixing matrices and show how possible symmetries in these can affect the BBN 4He 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 \ensuremathν_\ensuremathμ\ensuremath\rightleftharpoons\ensuremathνe oscillation interpretation of LSND would allow unique new constraints on the neutrino mixing angles in this model.