Thermal Production of Axinos in the Early Universe

Details Thermal Production of Axinos in the Early Universe Thermal Production of Axinos in the Early Universe

2004-07-28

arxiv.org/abs/hep-ph/0407324v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 2 figures. Talk given at Strong and Electroweak Matter 2004, Helsinki, Finland, June 16-19, 2004

Scientific paper

We compute the thermal axino production rate in supersymmetric QCD to leading order in the gauge coupling. Using hard thermal loop resummation and the Braaten-Yuan prescription, we obtain a finite result in a gauge-invariant way, which takes into account Debye screening in the hot quark-gluon-squark-gluino plasma. The relic axino density from thermal reactions in the early Universe is evaluated assuming the axino is the lightest supersymmetric particle and stable due to R-parity conservation. From the comparison with the WMAP results, we find that axinos could provide the dominant part of cold dark matter, for example, for an axino mass of 100 keV and a reheating temperature of 10^6 GeV.

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