Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-09-10
JCAP 0901:027,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
Published Version
Scientific paper
10.1088/1475-7516/2009/01/027
The impact of a kination-dominated phase generated by a quintessential exponential model on the thermal abundance of gravitinos and axinos is investigated. We find that their abundances become proportional to the transition temperature from the kination to the radiation era; since this temperature is significantly lower than the initial ("reheating") temperature, the abundances decrease with respect to their values in the standard cosmology. For values of the quintessential energy-density parameter close to its upper bound, at the eve of nucleosynthesis, we find the following: (i) for unstable gravitinos, the gravitino constraint is totally evaded; (ii) If the gravitino is stable, its thermal abundance is not sufficient to account for the cold dark matter of the universe; (iii) the thermal abundance of axinos can satisfy the cold dark matter constraint for values of the initial temperature well above those required in the standard cosmology. A novel calculation of the axino production rate by scatterings at low temperature is also presented.
Gomez Mario E.
Lola Smaragda
Pallis Constantinos
Rodríguez-Quintero José
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