Electroweak baryogenesis at high wall velocities

Understand

It is widely believed that electroweak baryogenesis should be suppressed in strong phase transitions with fast-moving bubble walls, but this effect has never been quantitatively studied.

• We rederive fluid equations describing transport of particle asymmetries near the bubble wall without making the small-wall-velocity approximation.
• We show that the suppression of the baryon asymmetry is a smooth function of the wall speed and that there is no special behavior when crossing the sound speed barrier.
• Electroweak baryogenesis can thus be efficient also with strong detonations, generically associated with models with observably large gravitational waves.