  We propose a novel mechanism for production of baryonic asymmetry in the
early Universe. The mechanism takes advantage of the strong first order phase
transition that produces runaway bubbles in the hidden sector that propagate
almost without friction with ultra-relativistic velocities. Collisions of such
bubbles can non-thermally produce heavy particles that further decay
out-of-equilibrium into the SM and produce the observed baryonic asymmetry.
This process can proceed at the very low temperatures, providing a new
mechanism of post-sphaleron baryogenesis. In this paper we present a fully
calculable model which produces the baryonic asymmetry along these lines as
well as evades all the existing cosmological constraints. We emphasize that the
Gravitational Waves signal from the first order phase transition is completely
generic and can potentially be detected by the future eLISA interferometer. We
also discuss other potential signals, which are more model dependent, and point
out the unresolved theoretical questions related to our proposal.
