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The bubble wall velocity in an electroweak first order phase transition is akey quantity both for electroweak baryogenesis and for the production of astochastic background of gravitational waves that may be probed in the futurethrough gravitational wave experiments like LISA or BBO. We show that, contraryto the conclusion drawn from previous studies, it is actually possible togenerate a potentially large gravitational wave signal while satisfying therequirements for viable electroweak baryogenesis, once the effects of thehydrodynamics of bubble growth are taken into account. Then, the observation ofa large gravitational wave background from the electroweak phase transitionwould not necessarily rule out electroweak baryogenesis as the mechanism havinggenerated the observed baryon asymmetry of the universe.

Large Gravitational Wave Background Signals in Electroweak Baryogenesis Scenarios