An extended analysis for a generalized Chaplygin gas model

Abstract

In this work, we have extended the analysis on the generalized Chaplygin gas (GCG) model as the unification of dark energy and dark matter. Specifically, we have shown that the model of our consideration known as the new generalized Chaplygin gas (NGCG) model, admits a scalar field description, which means that there exist a minimally coupled scalar field for a given scalar field potential where the equation of state is that of the NGCG. With the use of the later property we can construct the slow-roll parameters and derive the corresponding values for the spectral indices for the tensor to scalar perturbation and for the density perturbations. We have also studied the growth rate of matter perturbations in the NGCG scenario. Finally, we have studied the viability of the generalized second law of thermodynamics by assuming that the dynamical apparent horizon in a NGCG universe is endowed with Hawking temperature and Bekenstein entropy.

v2: 20 pages, 4 figures, Accepted for publication in EPJC

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Cited by in corpus (7)

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• Dynamical systems analysis of an interacting scalar field model in an anisotropic universe
• Dark energy effects on realistic neutron stars
• Dynamical system analysis in multiscalar-torsion cosmology
• Evolution of perturbations in a universe with exotic solid-like matter
• The Lambert $W$ equation of state in light of DESI BAO
• Unifying the Dark Sector with the New Generalized Chaplygin Gas: Observational Constraints