Ruling out the Modified Chaplygin Gas Cosmologies

Abstract

The Modified Chaplygin Gas (MCG) model belongs to the class of a unified models of dark energy (DE) and dark matter (DM). It is characterized by an equation of state (EoS) $p_c=B\rho -A/{\rho }^{\alpha }$, where the case $B=0$ corresponds to the Generalized Chaplygin Gas (GCG) model. Using a perturbative analysis and power spectrum observational data we show that the MCG model is not a sucessful candidate for the cosmic medium unless $B=0$. In this case, it reduces to the usual GCG model.

Latex file, 7 pages, 6 figures in eps format

References in corpus (4)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Constraints on modified Chaplygin gas from recent observations and a comparison of its status with other models
• Matter power spectrum for the generalized Chaplygin gas model: The relativistic case
• A mathematical analysis of the evolution of perturbations in a modified Chaplygin gas model

Cited by in corpus (2)

• Modified Chaplygin Gas Cosmology
• Constraints on the dark matter sound speed from galactic scales: the cases of the Modified and Extended Chaplygin Gas