Anisotropic Cosmological Models with a Generalized Chaplygin Gas

Chaplygin gas dominated anisotropic brane world cosmological models

ar X iv : g r - qc / 0 40 30 62 v 1 1 5 M ar 2 00 4 The Chaplygin gas as a model for dark energy

We review the essential features of the Chaplygin gas cosmological models and provide some examples of appearance of the Chaplygin gas equation of state in modern physics. A possible theoretical basis for the Chaplygin gas in cosmology is discussed. The relation with scalar field and tachyon cosmological models is also considered.

Observational Constraints on the Generalized Chaplygin Gas

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...

Mass Power Spectrum in a Universe Dominated by the Chaplygin Gas

The mass power spectrum for a Universe dominated by the Chaplygin gas is evaluated numerically from scales of the order of the Hubble horizon to 100 Mpc. The results are compared with a pure baryonic Universe and a cosmological constant model. In all three cases, the spectrum increases with k, the wavenumber of the perturbations. The slope of the spectrum is higher for the baryonic model and sm...

N ov 2 00 6 Remarks on the Generalized Chaplygin Gas

The recent observation of accelerated expansion of the universe, concluded [1] from the study of luminosity of type Ia distant supernova, has put Cosmology in the center stage. Our inability to explain the origin of this expansion has led to the naming of this phenomenon as ”Dark Energy” effect. The coinage obviously matches the other fuzzy area in Cosmology, i.e. the existence of ”Dark Matter”...