Do subcritical bubbles hinder first order phase transition?

We consider the role played by subcritical bubbles during the electroweak phase transition, estimate their average size, amplitude and formation rate taking into account the crucial role played by thermalization. We also study the influence of subcritical bubbles on the formation of critical bubbles in the thin wall regime and show that, contrary to some recent claims, subcritical bubbles do not affect the nucleation of critical bubbles in an appreciable way. From this fact we conclude that the electroweak baryogenesis scenarios associated with a first order electroweak phase transition still remain an attractive possibility. [email protected]; [email protected]. Address after November 95: Theoretical Astrophysics Group, NASA/Fermilab, Batavia, IL60510, USA.; [email protected]