  The classification of the hydrodynamical growth mechanisms for the spherical
bubbles of the low-temperature phase in cosmological phase transitions is
completed by showing that the bubbles can grow as supersonic deflagrations.
Such deflagrations consist of a Jouguet deflagration, followed by a rarefaction
wave. Depending on the amount of supercooling, the maximal velocity of
supersonic deflagrations varies between the sound and the light velocities. The
solutions faster than supersonic deflagrations are weak detonations.
