Affleck-Dine cogenesis

Abstract

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, Ω_(DM)/Ω_B ∼ 5. These theories typically predict macroscopic lifetimes for the lightest observable supersymmetric particle as it decays to the dark matter.

Files

Additional details