Big Bang Nucleosynthesis and Lepton Number Asymmetry in the Universe

K. Kohri; M. Kawasaki; Katsuhiko Sato

doi:10.1017/S0074180900133030

Big Bang Nucleosynthesis and Lepton Number Asymmetry in the Universe

Published online by Cambridge University Press: 25 May 2016

K. Kohri ,

M. Kawasaki and

Katsuhiko Sato

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K. Kohri: Affiliation:
Institute for Cosmic Ray Research, University of Tokyo, Tanashi, Tokyo 188, Japan
M. Kawasaki: Affiliation:
Institute for Cosmic Ray Research, University of Tokyo, Tanashi, Tokyo 188, Japan
Katsuhiko Sato: Affiliation:
Department of Physics and Research Center for the Early Universe, School of Science, University of Tokyo, Tokyo 113, Japan

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Recently it has been reported that there may be a discrepancy between big bang nucleosynthesis theory and observations (BBN crisis) (Hata et al., 1995). One way to solve the discrepancy might be to adopt some modifications of standard physics used in SBBN (Kawasaki et al, 1997). We show that BBN predictions agree with the primordial abundances of light elements, 4He, D, 3He and 7Li inferred from the observational data if the electron neutrino has a net chemical potential ξve due to lepton asymmetry (Kohri et al., 1997). We study BBN with the effects of the neutrino degeneracy in details using Monte Carlo simulation and make a likelihood analysis using the most recent data. We estimate that (95% C.L.) and (95% C.L.) adopting the presolar Deuterium abundance as the primordial values. If we adopted the low D abundance which is obtained by the observation of the high redshift QSO absorption systems, (95% C.L.) and The estimated chemical potential of ve is about 10−5 eV which is much smaller than experiments can detect (≃ 1 eV). In other words, BBN gives the most stringent constraint on the chemical potential of ve.