Abundance of Cosmological Relics in Low-Temperature Scenarios

Details Abundance of Cosmological Relics in Low-Temperature Scenarios Abundance of Cosmological Relics in Low-Temperature Scenarios

2006-03-21

arxiv.org/abs/hep-ph/0603165v2

Phys.Rev. D73 (2006) 123502

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages, 8 figures, comments added, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.73.123502

We investigate the relic density n_\chi of non-relativistic long-lived or stable particles \chi in cosmological scenarios in which the temperature T is too low for \chi to achieve full chemical equilibrium. The case with a heavier particle decaying into \chi is also investigated. We derive approximate solutions for n_\chi(T) which accurately reproduce numerical results when full thermal equilibrium is not achieved. If full equilibrium is reached, our ansatz no longer reproduces the correct temperature dependence of the \chi number density. However, it does give the correct final relic density, to an accuracy of about 3% or better, for all cross sections and initial temperatures.

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