B-ball dark matter and baryogenesis

it has been recently suggested that stable, supersymmetric B-balls formed i n the early universe could not only be the dark matter at the present epoch , but also be responsible for baryogenesis by their partial evaporation at high temperatures. We reinvestigate the efficiency of B-ball baryogenesis a nd find it to be limited by the diffusion of baryon number away from the B- balls. Successful baryogenesis may only occur for B-balls with charges Q le ss than or similar to 10(20)-5 x 10(23), which is close to the observationa l lower limits on the Q of a significant B-ball dark matter component. We a lso present some cosmological constraints on the abundances of larger B-bal ls in the early universe. (C) 2000 Elsevier Science B.V. All rights reserve d.