Observational Constraints on the Generalized Chaplygin Gas

TL;DR

This paper investigates a cosmological model with dark energy modeled as the Generalized Chaplygin Gas, considering spatial curvature and constraining parameters using astronomical data.

Contribution

It introduces observational constraints on the Generalized Chaplygin Gas parameters within a curved universe model, extending previous flat-universe analyses.

Findings

Constraint $ u \,\lesssim\, \alpha$ aligns well with observations

Parameter ranges are restricted by astronomical data

Curved geometry effects are incorporated into the model

Abstract

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 $\nu$ and the $\alpha$ parameters. We use different astronomical data for restricting these parameters. It is shown that the constraint $\nu \lesssim \alpha$ agrees enough well with the astronomical observations.