Study of Inflationary Generalized Cosmic Chaplygin Gas for Standard and Tachyon Scalar Fields

TL;DR

This paper investigates inflationary models using generalized cosmic Chaplygin gas with standard and tachyon scalar fields, analyzing their compatibility with observational data through various inflationary parameters.

Contribution

It introduces a framework for inflationary cosmology with generalized cosmic Chaplygin gas and evaluates key inflationary parameters during different inflationary regimes.

Findings

Model remains incompatible with WMAP7 and Planck data

Scalar and tensor spectra are computed for both fields

Inflationary parameters are analyzed graphically

Abstract

We consider an inflationary universe model in the context of generalized cosmic Chaplygin gas by taking matter field as standard and tachyon scalar fields. We evaluate the corresponding scalar fields and scalar potentials during intermediate and logamediate inflationary regimes by modifying the first Friedmann equation. In each case, we evaluate the number of e-folds, scalar as well as tensor power spectra, scalar spectral index and important observational parameter, i.e., tensor-scalar ratio in terms of inflatons. The graphical behavior of this parameter shows that the model remains incompatible with WMAP7 and Planck observational data in each case.