Generalized Chaplygin gas and CMBR constraints

Details Generalized Chaplygin gas and CMBR constraints Generalized Chaplygin gas and CMBR constraints

2002-10-21

arxiv.org/abs/astro-ph/0210468v2

Phys.Rev. D67 (2003) 063003

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, revtex4; results updated using Archeops data

Scientific paper

10.1103/PhysRevD.67.063003

We study the dependence of the location of the Cosmic Microwave Background Radiation (CMBR) peaks on the parameters of the generalized Chaplygin gas model, whose equation of state is given by $p = - A/\rho^{\alpha}$, where $A$ is a positive constant and $0 < \alpha \le 1$. We find, in particular, that observational data arising from Archeops for the location of the first peak, BOOMERANG for the location of the third peak, supernova and high-redshift observations allow constraining significantly the parameter space of the model. Our analysis indicates that the emerging model is clearly distinguishable from the $\alpha = 1$ Chaplygin case and the $\Lambda$CDM model.

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