Abstract
The similarity of the observed densities of baryons and cold dark matter suggests thatthey have a common or related origin. This can be understood in the context ofthe MSSM with right-handed (RH) sneutrinos if cold dark matter is due to ad = 4 flat direction condensate of very weakly coupled RH sneutrino LSPs andthe baryon asymmetry is generated by Affleck–Dine leptogenesis along thed = 4 (HuL)2 flatdirection. The correct density of RH sneutrino dark matter is obtained if the reheating temperature is in therange 106–108 GeV. A cold dark matter isocurvature perturbation close to presentobservational bounds is likely in the case of inflation driven by aD-term orby an F-term with suppressed Hubble corrections to theA-terms. An observable baryon isocurvature perturbation is also possible in the case ofD-term inflation models.
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