  The quark-gluon plasma, formed in the first 3 fm/c of the heavy ion
collisions at RHIC and LHC, supercooles due to nucleation and develops soon a
negative pressure in the bag model. The negative pressure yields mechanical
instability which may lead to a sudden timelike deflagration to a (super)heated
hadron gas. The resulting freeze-out times are shorter than those of the
standard nucleation scenario.
