Affleck-Dine cogenesis

We propose a novel framework in which the observed baryon and dark matter abundances are simultaneously generated via the Affleck-Dine mechanism. In its simplest realization, Affleck-Dine cogenesis is accomplished by a single superpotential operator and its A-term counterpart. These operators explicitly break B - L and X, the dark matter number, to the diagonal B - L + X. In the early universe these operators stabilize supersymmetric flat directions carrying nonzero B - L and X, and impart the requisite CP violation for asymmetry generation. Because B - L + X is preserved, the resulting B - L and X asymmetries are equal and opposite, though this precise relation may be relaxed if B - L and X are violated separately by additional operators. Our dark matter candidate is stabilized by R parity and acquires an asymmetric abundance due to its nonzero X number. For a dark matter mass of order a few GeV, one naturally obtains the observed ratio of energy densities today, Omega(DM)/Omega(B) similar to 5. These theories typically predict macroscopic lifetimes for the lightest observable supersymmetric particle as it decays to the dark matter.