# WMAP and the generalized Chaplygin gas

@article{Amendola2003WMAPAT, title={WMAP and the generalized Chaplygin gas}, author={Luca Amendola and Fabio Finelli and C. Burigana and Daniel Carturan}, journal={Journal of Cosmology and Astroparticle Physics}, year={2003}, volume={2003}, pages={005-005} }

We compare the WMAP temperature power spectrum and SNIa data to models with a generalized Chaplygin gas as dark energy. The generalized Chaplygin gas is a component with an exotic equation of state, pX = −A/ραX (a polytropic gas with negative constant and exponent). Our main result is that, restricting to a flat universe and to adiabatic pressure perturbations for the generalized Chaplygin gas, the constraints at 95% CL to the present equation of state wX = pX/ρX and to the parameter α are −1…

## 177 Citations

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- PhysicsPhysics of the Dark Universe
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- 2009

The Chaplygin gas (CG) and the generalized Chaplygin gas (GCG) models, proposed as candidates of the unified dark matter-dark energy (UDME), are tested with the look-back time (LT) redshift data. We…

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- Physics
- 2017

Abstract Yes, but only for a parameter value that makes it almost coincide with the standard model. We reconsider the cosmological dynamics of a generalized Chaplygin gas (gCg) which is split into a…

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- Physics
- 2012

In this paper, we revisit the generalized Chaplygin gas (GCG) model as a unified dark matter and dark energy model. The energy density of GCG model is given as ρGCG/ρGCG0=[Bs+(1−Bs)a−3(1+α)]1/(1+α),…

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- Physics
- 2004

Although various cosmological observations congruously suggest that our universe is dominated by two dark com- ponents, the cold dark matter without pressure and the dark energy with negative…

Generalized Chaplygin Gas Models Tested with Type Ia Supernovae

- Physics
- 2004

The generalized Chaplygin gas (GCG), with the equation of state p = -A/ρα, was recently proposed as a candidate for dark energy in the universe. In this paper we confront the GCG with Type Ia…

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- Physics
- 2013

We investigate the unification scenario provided by the generalized Chaplygin gas model (a perfect fluid characterized by an equation of state p=−A/ρα). Our concerns lie with a possible tension…

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- Physics
- 2011

The generalized Chaplygin gas model represents an attempt to unify dark matter and dark energy. It is characterized by a fluid with the equation of state p = −A/ρα. It can be obtained from a…

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- Physics
- 2007

Abstract We examine observational constraints on the generalized Chaplygin gas (GCG) model for dark energy from the 9 Hubble parameter data points, the 115 SNLS Sne Ia data and the size of baryonic…

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- Physics
- 2009

We investigate observational constraints on the generalized Chaplygin gas (GCG) model as the unification of dark matter and dark energy from the latest observational data: the Union SNe Ia data, the…

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