Impact of massive tau-neutrinos on primordial nucleosynthesis. Exact calculations

Details Impact of massive tau-neutrinos on primordial nucleosynthesis. Exact calculations Impact of massive tau-neutrinos on primordial nucleosynthesis. Exact calculations

1997-12-06

arxiv.org/abs/hep-ph/9712284v3

Nucl.Phys. B524 (1998) 621-638

Physics

High Energy Physics

High Energy Physics - Phenomenology

30 pages, 9 figures, 2 tables, revised figures, minor changes

Scientific paper

10.1016/S0550-3213(98)00307-1

The influence of a massive Majorana tau-neutrino on primordial nucleosynthesis is rigorously calculated. The system of three integro-differential kinetic equations is solved numerically for the tau-neutrino mass in the interval from 0 to 20 MeV. It is found that the usual assumption of kinetic equilibrium is strongly violated and non-equilibrium corrections considerably amplify the effect. Even a very weak restriction from nucleosynthesis, allowing for one extra massless neutrino species, permits to conclude that m_\nu_\tau < 1 MeV. For a stricter bound, e.g. for dN < 0.3, the limit is m_\nu_\tau < 0.35 MeV.

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