Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-03-05
Phys.Lett.B669:46-51,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 4 figures (updated WMAP constraints)
Scientific paper
10.1016/j.physletb.2008.09.032
The sensitivity of the lightest supersymmetric particle relic density calculation to the variation of the cosmological expansion rate before nucleosynthesis is discussed. We show that such a modification, even extremely modest and with no consequence on the cosmological observations, can greatly enhance the calculated relic density, and therefore change the constraints on the SUSY parameter space drastically. We illustrate this variation in two examples of SUSY models, and show that it is unsafe to use the lower bound of the WMAP limits in order to constrain supersymmetry. We therefore suggest to use only the upper value Omega_DM h^2 < 0.135.
Arbey Alexandre
Mahmoudi Farvah
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