Observational Constraints on Flat Chaplygin Quartessence Models

Details Observational Constraints on Flat Chaplygin Quartessence Models Observational Constraints on Flat Chaplygin Quartessence Models

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005tmgm.meet.1779m&link_type=abstract

The Tenth Marcel Grossmann Meeting. Proceedings of the MG10 Meeting held at Brazilian Center for Research in Physics (CBPF), Rio

Physics

Scientific paper

We derive the constraints set by several experiments on the Chaplygin quartessence model. In this scenario, a single fluid component drives the Universe from a non-relativistic matter dominated phase to an accelerated expansion phase behaving, first, like dark matter and in a more recent epoch as dark energy. We consider current data from SNIa experiments, statistics of gravitational lensing, FR IIb radio galaxies and X-ray gas mass fraction in galaxy clusters. We obtain the confidence region on the two parameters of the model from a combined analysis of all the above tests. We find that the best fit occurs close to the ΛCDM limit (α = 0). The standard Chaplygin quartessence (α = 1) is also allowed by the data, but only at ~ 2σ level.

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