Baryogenesis via relativistic bubble expansion

Understand

We present a novel baryogenesis mechanism in which the asymmetry is sourced from heavy particles which either gain their mass or are created during bubble expansion in a strong first order phase transition.

• These particles then decay in a CP and baryon number violating way inside the bubble.
• The particles are inherently out-of-equilibrium and sufficiently dilute after wall crossing so the third Sakharov condition is easily met.
• Washout is avoided provided the reheat temperature is sufficiently below the scale of the heavy particles.