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In the framework of the minimal cosmological standard model, the $\Lambda$CDMmodel, the Dark Matter density is now known with an error of a few percent;this error is expected to shrink even further once PLANCK data are analyzed.Matching this precision by theoretical calculations implies that at leastleading radiative corrections to the annihilation cross section of the darkmatter particles have to be included. Here we compute one kind of largecorrections in the context of the minimal supersymmetric extension of theStandard Model: corrections associated with two-point function corrections onchargino and neutralino lines. These can be described by effectivechargino/neutralino-fermion-sfermion andchargino/neutralino-chargino/neutralino-Higgs couplings. We also employone-loop corrected chargino and neutralino masses, using a recently developedversion of the on-shell renormalization scheme. The resulting correction to thepredicted Dark Matter density depends strongly on parameter space, but caneasily reach 3%.

Radiative Corrections to the Neutralino Dark Matter Relic Density - an Effective Coupling Approach