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The hypothesis that dark matter and dark energy are unified through theChaplygin gas is reexamined. Using generalizations of the spherical model whichincorporate effects of the acoustic horizon we show that an initiallyperturbative Chaplygin gas evolves into a mixed system containing cold darkmatter-like gravitational condensate.Comment: 11 pages, 3 figures, substantial revision, title changed, content  changed, added references, to appear in JCA

Nonlinear evolution of dark matter and dark energy in the Chaplygin-gas cosmology