An improved cosmological bound on the tau-neutrino mass

Abstract

We consider the influence of non-equilibrium electronic neutrinos (and anti-neutrinos) on the neutron-to-proton ratio. These neutrinos would come from massive ${\nu }_{\tau }$ annihilations ${\bar{\nu }}_{\tau }{\nu }_{\tau }\to {\bar{\nu }}_e{\nu }_e$. For sufficiently large ${\nu }_{\tau }$ masses this new effect would strongly enhance the (n/p)-ratio, leading to a very stringent bound on the ${\nu }_{\tau }$ mass, even adopting a rather weak upper bound on the effective number on neutrino species during nucleosynthesis.

arXiv comment10 pages, LaTex file + 1 figure compressed using uufiles

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Cited by in corpus (12)

• Big Bang nucleosynthesis and physics beyond the Standard Model
• Renormalization Group Induced Neutrino Mass in Supersymmetry without R-parity
• A Simple Phenomenological Parametrization of Supersymmetry without R-Parity
• Supersymmetry without R-parity : Constraints from Leptonic Phenomenology
• Primordial Nucleosynthesis, Majorons and Heavy Tau Neutrinos
• LEP Sensitivities to Spontaneous R-Parity Violating Signals
• Impact of massive tau-neutrinos on primordial nucleosynthesis. Exact calculations
• Unstable massive tau-neutrinos and primordial nucleosynthesis
• Nonequilibrium corrections to energy spectra of massive particles in expanding universe
• Cosmological abundances of right-handed neutrinos
• Neutrinos Properties Beyond the Standard Model
• Recent Results on Neutrino Masses