Generalized Chaplygin Gas Model: Dark Energy - Dark Matter Unification and CMBR Constraints

TL;DR

This paper investigates the generalized Chaplygin gas model as a unified explanation for dark energy and dark matter, using CMBR and supernova data to constrain its parameters.

Contribution

It provides new constraints on the GCG model parameters based on recent CMBR and supernova observations, testing its viability as a unification model.

Findings

Constraints on GCG parameters from WMAP and BOOMERanG data

Compatibility of GCG model with observed CMBR peaks

Implications for dark energy and dark matter unification

Abstract

The generalized Chaplygin gas (GCG) model allows for an unified description of the recent accelerated expansion of the Universe and the evolution of energy density perturbations. This dark energy - dark matter unification is achieved through an exotic background fluid whose equation of state is given by $p = - A/\rho^{\alpha}$, where $A$ is a positive constant and $0 < \alpha \le 1$. Stringent constraints on the model parameters can be obtained from recent WMAP and BOOMERanG bounds on the locations of the first few peaks and troughs of the Cosmic Microwave Background Radiation (CMBR) power spectrum as well as SNe Ia data.