In this paper we study a quintessence cosmological model in which the dark energy component is considered to be the Generalized Chaplygin Gas and the curvature of the three-geometry is taken into account. Two parameters characterize this sort of fluid, the ν and the α parameters. We use different astronomical data for restricting these parameters. It is shown that the constraint ν . α agrees en...

We consider a new approach for Chaplygin cosmology, in which the relativistic formulation of Chaplygin matter is of crucial importance. Our results show that (for all times) the universe consists of a novel form of matter with dust like density (∼ (volume) −1) and negative pressure. This is in contrast to the usual Chaplygin cosmology, based on non-relativistic equation of state, that implies a...

The present work employs the Linder parametrization of a constant growth index \cite{linder/index} to investigate evolution rate clustering and dissipation configurational entropy in some most widely studied Chaplygin gas models, such as generalized modified gas. model parameters models are found play vital role rate, dark energy density parameter, EoS entropy. Furthermore, communicates change ...

We study the fate of density perturbations in an Universe dominate by the Chaplygin gas, which exhibit negative pressure. We show that it is possible to obtain the value for the density contrast observed in large scale structure of the Universe by fixing a free parameter in the equation of state of this gas. The negative character of pressure must be significant only very recently. PACS number(...