Observational constraints on Chaplygin quartessence

Details Observational constraints on Chaplygin quartessence Observational constraints on Chaplygin quartessence

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23....4m&link_type=abstract

Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 4-5

Astronomy and Astrophysics

Astronomy

Scientific paper

We derive the constraints set by several experiments on a realization of the quartessence scenario given by the Generalized Chaplygin Gas (GCG). In this scenario, a single fluid component drives the Universe from a nonrelativistic 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 gravitational lenses, high redshift quasars, the position of the peaks on the CMB spectrum (including recent WMAP data), SNIa experiments, FRIIb radio galaxies and the age of the Universe. We investigate the constraints from this data set on flat GCG dominated cosmologies with no Cold Dark Matter. We show that a combined analysis of this data allows to constrain the GCG equation of state, determined by the parameters A and a. We find that current data provide strong indications against the Chaplygin gas. However, the GCG is consistent with the data for a limited range of parameters that includes the CDM model.

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