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Abstract:
Within the low-energy effective minimal supersymmetric extension of the standard model (effMSSM) we calculate the neutralino relic density taking into account slepton-neutralino and neutralino-chargino or neutralino-neutralino coannihilation channels. We perform a comparative study of these channels and conclude that both of them give sizable contributions to the reduction of the relic density. Because of these coannihilation processes, some models (mostly with large neutralino masses) enter into the cosmologically interesting region for relic density, but other models leave this region. Nevertheless, in general, the predictions for direct and indirect dark matter detection rates are not strongly affected by these coannihilation channels in the effMSSM
