2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46725We show that in the presence of sufficiently strong tau neutrino annihilations into majorons, the primordial nucleosynthesis constraints can not rule out tau neutrino masses in the MeV range.7 pages, LaTeX, 4 Postscript Figures. Talk given at the International Workshop "New Worlds in Astroparticle Physics", held in Faro, Portugal, 8-10 September 1996High Energy Physics - Phenomenologytext