The Chaplygin gas and the evolution of dark matter and dark energy in the Universe

The hypothesis that dark matter and dark energy are unified through the Chaplygin gas is reexamined. Using a generalization of the spherical model which incorporates effects of the acoustic horizon we show that an initially perturbative Chaplygin gas evolves into a mixed system containing cold dark matter like gravitational condensate. Further, by including both condensate and residual gas, we demonstrate that the observed CMB angular and baryonic power spectra are reproduced