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Astron. Astrophys. 327, 443-452 (1997)

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Primordial nucleosynthesis with massive [FORMULA] neutrinos

J.B. Rehm 1, G.G. Raffelt 2 and A. Weiss 1

1 Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str.1, D-85745 Garching, Germany
2 Max-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)


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© European Southern Observatory (ESO) 1997

Online publication: April 6, 1998