Corrections radiatives en Supersymétrie et applications au calcul de la densité relique au-delà de l'ordre dominant.

TL;DRAbstract

This thesis focussed on the evaluation of supersymmetric radiative corrections for processes entering in the calculation of the relic density of dark matter, in the MSSM and the standard cosmological scenario, as well as the impact of the choice renormalisation scheme in the neutralino/chargino sector based on the measure of three physical masses. This study has been carried out with the help of an automatic program dedicated the the computation of physical observables at one-loop in the MSSM, called SloopS. For the relic density calculation we investigated scenarios where the most studied dark matter candidate, the neutralino, annihilates into gauge boson pair. We covered cases where its mass was of the order of hundreds of GeV to 2 TeV. The full set of electroweak and strong corrections has been taken into account, involved in sub-leading channels with quarks. In the case of very heavy neutralinos, two important effects were outlined : the Sommerfeld enhancement due to massive gauge

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