Constraints from Primordial Nucleosynthesis on Neutrino Degeneracy

  • Ho-Shik Kang
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 169)


We present the permissible ranges of, and most stringent constraints on, the lepton asymmetry(degeneracy), particulary the electron-neutrino asymmetry, for different baryon asymmetries by comparing calculated primordial abundances of the light elements(D, 3 He, 4 He, 7 Li) in Big Bang Nucleosynthesis(BBN) with those abundances inferred from current observational data. Furthermore, we show that the Universe can be closed by baryons only (Ωb = 1) if neutrinos are sufficiently degenerate. Finally, we study the behaviour of the abundances of the light elements for different baryon and lepton asymmetries.


Light Element Light Neutrino Baryon Asymmetry Stringent Constraint Allowed Region 
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Copyright information

© Springer Science+Business Media Dordrecht 1991

Authors and Affiliations

  • Ho-Shik Kang
    • 1
  1. 1.Department of PhysicsThe Ohio State UniversityColumbusUSA

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