Constraints from Primordial Nucleosynthesis on Neutrino Degeneracy
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.
KeywordsLight Element Light Neutrino Baryon Asymmetry Stringent Constraint Allowed Region
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
Kang, H.-S. and Steigman, G. (1990), to be submitted to Nucl. Phys
, Dec. 1990.Google Scholar
David, Y. and Reeves, H., (1980), Phil. Trans. Roy. Soc.
, 415.ADSGoogle Scholar
Steigman, G., (1979), Ann. Rev. Nucl. Part. Sci.
, 313.ADSCrossRefGoogle Scholar
Steigman, G., (1985), Nucleosynthesis and Its Implications on Nuclear and Particle Physics
, in J. Audouze and N. Mathieu (eds.), NATO ASI Series, vol. 163, p. 45.Google Scholar
© Springer Science+Business Media Dordrecht 1991