Thermal production of axinos in the early universe
Aug, 20045 pages
Part of Proceedings, 6th International Conference on Strong and Electroweak Matter (SEWM 2004) : Helsinki, Finland, June 16-19, 2004, 271-275
Contribution to:
- , 271-275
- SEWM 2004
- Published: 2005
e-Print:
- hep-ph/0407324 [hep-ph]
Report number:
- DESY-04-134
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Abstract:
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.Note:
- 5 pages, 2 figures. Talk given at Strong and Electroweak Matter 2004, Helsinki, Finland, June 16-19, 2004
- talk: Helsinki 2004/06/16
- axino: production
- quantum chromodynamics
- supersymmetry
- hard thermal loop approximation
- screening: Debye
- plasma
- axino: density
- dark matter
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