WMAP and the generalized Chaplygin gas
By Luca Amendola, F. Finelli, C. Burigana, D. Carturan. 2003
223 citations recorded by the source corpus.
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 ≤ wX < −0.8, 0 ≤ α < 0.2, respectively. Moreover, we show that a Chaplygin gas (α = 1) is ruled out as a candidate for dark energy by our analysis at more than the 99.99% CL. A generalized Chaplygin gas appears much less likely as a unified dark matter candidate (ΩCDM = 0) than as a dark energy model, although its χ2 is only two sigma away from the expected value.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/ab81cbc1b1f1e149023fc8a997d75f76369c5049
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Citations in the corpus
- Generalized Chaplygin gas as a unified scenario of dark matter/energy: Observational constraints (2004, background): “…and Bertolami 2003; Cunha, Alcaniz and Lima 2004; Bertolami et al. 2004), the CMB anisotropy measurements (Bento et al. 2003a,b; Bean and Dore 2003; Amendola et al. 2003), the gravitational lensing surveys (Dev, Jain and Alcaniz 2003, 2004; Silva and Bertolami 2003; Makler et al. 2003b; Chen…”