Catalyzed Baryogenesis
  A novel mechanism, "catalyzed baryogenesis," is proposed to explain the
observed baryon asymmetry in our universe. In this mechanism, the motion of a
ball-like catalyst provides the necessary out-of-equilibrium condition, its
outer wall has CP-violating interactions with the Standard Model particles, and
its interior has baryon number violating interactions. We use the
electroweak-symmetric ball model as an example of such a catalyst. In this
model, electroweak sphalerons inside the ball are active and convert baryons
into leptons. The observed baryon number asymmetry can be produced for a light
ball mass and a large ball radius. Due to direct detection constraints on relic
balls, we consider a scenario in which the balls evaporate, leading to dark
radiation at testable levels.
