Constraints on the Generalized Chaplygin Gas Model from Gamma-Ray Bursts

TL;DR

This paper uses gamma-ray bursts with cosmology-independent data and Bayesian methods to constrain the Generalized Chaplygin Gas Model, finding a preference for negative alpha and a lower H0 than previous estimates.

Contribution

It introduces a novel approach by applying gamma-ray burst data with Bayesian analysis to constrain the GCGM without circularity issues.

Findings

Negative alpha is favored in a flat universe.

Estimated H0 is lower than literature values.

Constraints are derived using cosmology-independent data.

Abstract

We study the Generalized Chaplygin gas model (GCGM) using Gamma-ray bursts as cosmological probes. In order to avoid the so-called circularity problem we use cosmology-independent data set and Bayesian statistics to impose constraints on the model parameters. We observe that a negative value for the parameter $\alpha$ is favoured if we adopt a flat Universe and the estimated value of the parameter $H_{0}$ is lower than that found in literature.