Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-06-24
JCAP 1003:012,2010
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
17 pages, 4 figures, corrected typos, references added, JHEP3 class; it matches the published version.
Scientific paper
10.1088/1475-7516/2010/03/012
Unified Dark Matter models describe Dark Matter and Dark Energy as a single entity which is, in the simplest case, embodied in a perfect barotropic fluid. It is a well-established fact that small adiabatic perturbations of Unified Dark Matter have an evolution characterised by oscillations and decay which provide predictions on the Cosmic Background Radiation anisotropies which are in poor agreement with observation. In this paper we investigate the generalised Chaplygin gas and we find that the Integrated Sachs-Wolfe effect excludes the model for $10^{-3} < \alpha < 350$. We discuss the implications on the background evolution of the Universe if large values of $\alpha$ are considered. In this case, the Universe expansion mimics a matter-dominated phase abruptly followed by a de Sitter one at the transition redshift $z_tr$. Thanks to an analysis of the type Ia supernovae Constitution set we are able to place $z_tr = 0.22$.
No associations
LandOfFree
The extreme limit of the generalized Chaplygin gas does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The extreme limit of the generalized Chaplygin gas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The extreme limit of the generalized Chaplygin gas will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-105780