  In this talk, we study the impact of first order phase transitions with fast
bubble walls on mechanisms of leptogenesis and baryogenesis. We begin our
exploration with the usual leptogenesis where the breaking of $B-L$ occurs via
a PT with fast walls. Then we move to a more exotic case where the $B-L$
breaking phase transition creates heavy particles in the plasma and catalizes
the leptogenesis. Finally, we apply the same production mechanism to the EWPT
at low energy and build a new model of EWBG. Those models are all original and
contain crucial new phenomenological aspects like the emission of large amount
of Gravitational waves.
