In this manuscript, we present a generalization of the interacting holographic dark energy model using two equations of states for the dark energy: the modified variable Chaplygin gas and the viscous generalized Chaplygin gas. The dynamics of the model are expressed by the use of scalar fields and the scalar potentials. PACS numbers: 98.80.Cq, 98.80.-k, 98.80.Jk ∗[email protected]

We investigate observational constraints on the variable Chaplygin gas model from the gold sample of type Ia supernova data and the recent measurements of the X-ray gas mass fractions in galaxy clusters. Combining these databases, we obtain a tight constraint on the two model parameters. Our results indicate that the original Chaplygin gas model is ruled out by the data at 99.7% confidence leve...

We employ the generalized Chaplygin gas of interacting dark energy to obtain the equation of state for the generalized Chaplygin gas energy density in non-flat universe. By choosing a negative value for B we see that w ef f Λ < −1, that corresponds to a universe dominated by phantom dark energy.

We discuss the physical effects of some accelerated world models on the width of the last scattering surface (LSS) of the cosmic microwave background radiation (CMBR). The models considered in our analysis are X-matter (XCDM) and a Chaplygin type gas. The redshift of the LSS does not depend on the kind of dark energy (if XCDM of Chaplygin). Further, for a Chaplygin gas, the width of the LSS is ...

The generalized Chaplygin gas is characterized by the equation of state p = −A/ρ, with α > −1 and w > −1. We generalize this model to allow for the cases where α < −1 or w < −1. This generalization leads to three new versions of the generalized Chaplygin gas: an early phantom model in which w ≪ −1 at early times and asymptotically approaches w = −1 at late times, a late phantom model with w ≈ −...

We consider a new approach for Chaplygin gas cosmology, in which the relativistic formulation of Chaplygin matter is of crucial importance. Specifically, the dynamical content of this matter induces a generalizd energy conservation principle. 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, that i...

The evolution of a Universe modelled as a mixture of a Chaplygin gas and radiation is determined by taking into account irreversible processes. This mixture could interpolate periods of a radiation dominated, a matter dominated and a cosmological constant dominated Universe. The results of a Universe modelled by this mixture are compared with the results of a mixture whose constituents are radi...

We consider a variable Chaplygin gas model, which is characterized by an exotic equation of state, P = −A(a)/ρ, where A(a) is a positive function of the scale factor. By assuming a power-law function A(a) we find that the variable Chaplygin gas evolves as from dust to quiessence. We show that the model is consistent with current type Ia supernova data for a broad range of parameters. ∗e-mail ad...

In this work the modified Chaplygin gas is related to a cosmological scalar field. Analytical results, more general than the solutions previously shown in the literature, are presented for the case when the curvature is absent, and one entirely new particular result is shown for a case where there is curvature. Also, it is emphasized here that one interesting feature of the scalar field associa...

Some new class of Chaplygin wormholes are investigated in the framework of a Chaplygin gas with equation of state p = − ρ , A > 0. Since empty spacetime ( p = ρ = 0 ) does not follow Chaplygin gas, so the interior Chaplygin wormhole solutions will never asymptotically flat. For this reason, we have to match our interior wormhole solution with an exterior vacuum solution i.e. Schwarzschild solut...