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Astron. Astrophys. 327, 443-452

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Primordial nucleosynthesis with massive FORMULA neutrinos

J.B. Rehm1, G.G. Raffelt2, and A. Weiss1

1Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str.1, D-85745 Garching, Germany
2Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 München, Germany

Received 2 December 1996 / Accepted 26 June 1997


A massive long-lived FORMULA neutrino in the MeV regime modifies the primordial light-element abundances predicted by big-bang nucleosynthesis (BBN) calculations. This effect has been used to derive limits on FORMULA. Because recently the observational situation has become somewhat confusing and, in part, intrinsically inconsistent, we reconsider the BBN limits on FORMULA. To this end we use our newly developed BBN code to calculate the primordial abundances as a function of FORMULA and of the cosmic baryon density FORMULA. We derive concordance regions in the FORMULA-FORMULA-plane for several sets of alleged primordial abundances. In some cases a concordance region exists only for a nonvanishing FORMULA. At the present time BBN does not provide clear evidence for or against a FORMULA neutrino mass.

Key words: elementary particles - nuclear reactions, nucleosynthesis, abundances - cosmology: early universe

Send offprint requests to: J. Rehm (jan@mpa-garching.mpg.de)

© European Southern Observatory (ESO) 1997

Online publication: October 14, 1997
Last change: April 6, 1998