WMAP and the generalized Chaplygin gas

@article{Amendola2003WMAPAT,
  title={WMAP and the generalized Chaplygin gas},
  author={Luca Amendola and Fabio Finelli and Carlo 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… 

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References

SHOWING 1-10 OF 43 REFERENCES
Fitting the supernova type Ia data with the Chaplygin gas
The supernova type Ia observational data are fitted using a model with cold dark matter and the Chaplygin gas. The Chaplygin gas, which is characterized by a negative pressure varying with the
Cosmological consequences of a Chaplygin gas dark energy
A combination of recent observational results has given rise to what is currently known as the dark energy problem. Although several possible candidates have been extensively discussed in the
Cosmological Effects of a Class of Fluid Dark Energy Models
We study the impact of a generalized Chaplygin gas as a candidate for dark energy on density perturbations and on cosmic microwave background (CMB) anisotropies. The generalized Chaplygin gas is a
High - redshift objects and the generalized Chaplygin gas
Motivated by recent developments in particle physics and cosmology, there has been growing interest in a unified description of dark matter and dark energy scenarios. In this paper we explore
Generalized Chaplygin Gas, Accelerated Expansion and Dark Energy-Matter Unification
We consider the scenario emerging from the dynamics of a generalized $d$-brane in a $(d+1, 1)$ spacetime. The equation of state describing this system is given in terms of the energy density, $\rho$,
Letter: Density Perturbations in a Universe Dominated by the Chaplygin Gas
We study the fate of density perturbations in a Universe dominate by the Chaplygin gas, which exhibit negative pressure. In opposition to other models of perfect fluid with negative pressure, there
Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Angular Power Spectra
We present the temperature and polarization angular power spectra of the cosmic microwave background (CMB) derived from the first 5 years of WMAP data. The 5-year temperature (TT) spectrum is cosmic
Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
We present spectral and photometric observations of 10 Type Ia supernovae (SNe Ia) in the redshift range 0.16 " z " 0.62. The luminosity distances of these objects are determined by methods that
...
1
2
3
4
5
...