Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-02-03
Astropart.Phys.21:689-702,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, 4 figures, final version, including minor corrections
Scientific paper
10.1016/j.astropartphys.2004.05.
The decoupling of a cold relic, during a decaying-particle-dominated cosmological evolution is analyzed, the relic density is calculated both numerically and semi-analytically and the results are compared with each other. Using plausible values (from the point of view of supersymmetric models) for the mass and the thermal averaged cross section times the velocity of the cold relic, we investigate scenaria of equilibrium or non-equilibrium production. In both cases, acceptable results for the dark matter abundance can be obtained, by constraining the reheat temperature of the decaying particle, its mass and the averaged number of the produced cold relic. The required reheat temperature is in any case lower than about $20 {\rm GeV}$.
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