Ariel Megevand, Alejandro D. Sanchez
We consider the steady state motion of planar phase-transition fronts in first-order phase transitions of the Universe. We find the wall velocity as a function of the friction and the thermodynamical parameters, taking into account the different hydrodynamic modes of propagation. We obtain analytical approximations for the velocity by using the thin wall approximation and the bag equation of state. We discuss the range of validity of the approximations and compare our results to those of numerical calculations. We analyze the structure of the stationary solutions. Multiple solutions may exist for a given set of parameters, even after discarding non-physical ones. We discuss which of these will be realized in the phase transition as the stationary wall velocity.
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http://arxiv.org/abs/1206.2339
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