AXINO DARK MATTER FROM Q-BALLS

摘要

We show that the Ω_b --°Ω_(DM) coincidence can naturally be explained in a frame-work where axino cold dark matter is predominantly produced in non-thermalprocesses involving decays of Q-balls formed in Affleck-Dine baryogenesis. Inthis approach the similarity between Ω_b and Ω_(DM)is a direct consequence ofthe (sub-)GeV scale of the mass of the axino.