Fermi-Dirac corrections to relic abundances

Details Fermi-Dirac corrections to relic abundances Fermi-Dirac corrections to relic abundances

1992-11-09

arxiv.org/abs/hep-ph/9211231v1

Nucl.Phys. B402 (1993) 349-359

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages TPI-MINN-92/59-T

Scientific paper

10.1016/0550-3213(93)90646-7

We derive an equation for the evolution of the number density of a massive particle species in the early Universe, which correctly accounts for the Fermi-Dirac (FD) statistics. The FD-corrections are sizable and potentially important if the decoupling from the thermal equilibrium takes place at temperatures of the order of, or less than the mass of the particle. This is the case e.g.\ for a few MeV tau neutrino with the ordinary weak interactions.

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