Gravitino dark matter and baryon asymmetry from Q-ball decay in gauge
  mediation
  We investigate the Q-ball decay in the gauge-mediated SUSY breaking. Q balls
decay mainly into nucleons, and partially into gravitinos, while they are
kinematically forbidden to decay into sparticles which would be cosmologically
harmful. This is achieved by the Q-ball charge small enough to be unstable for
the decay, and large enough to be protected kinematically from unwanted decay
channel. We can then have right amounts of the baryon asymmetry and the dark
matter of the universe, evading any astrophysical and cosmological
observational constraints such as the big bang nucleosynthesis, which has not
been treated properly in the literatures.
