2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/5192We study the cosmological scenario arising from the dynamics of a generalized Chaplygin gas. The equation of state of the system is given in terms of the energy density, $ρ$, and pressure, $p$, by the relationship $p = - A/ρ^α$, where $A$ is a positive constant and $0 < α\le 1$. The conditions under which homogeneity arises are discussed and it is shown that this equation of state describes a universe evolving from a phase dominated by non-relativistic matter to a phase dominated by a cosmological constant via an intermediate period where the effective equation of state is $p = αρ$.4 pages. Talk presented by O.B. at the XVIIIth IAP Colloquium "On the Nature of Dark Energy", Paris, July 2002Astrophysicstext