Measuring the Chaplygin gas equation of state from angular and luminosity distances

Abstract

An exotic dark component, named generalized Chaplygin gas (Cg) and parameterized by an equation of state $p=-A/{\rho }_{Cg}^{\alpha }$ where $A$ and $\alpha$ are arbitrary constants, is one of the possible candidates for dark energy as well as for a unified scenario of dark matter/energy. In this paper we investigate qualitative and quantitative aspects of the angular size - redshift test in cosmological models driven by such a dark component. We discuss the prospects for constraining the Cg equation of state from measurements of the angular size at low and high redshift radio sources and also from a joint analysis involving angular size and supernova data. A detailed discussion about the influence of the Cg on the minimal redshift at which the angular size of an extragalactic source takes its minimal value is also presented.

Accepted for publication in The Astrophysical Journal, 18 ApJ preprint pages including 5 figures

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• Astrophysics in 2005