Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-08-26
Astrophys.J.618:16,2005; Astrophys.J.618:16-22,2004
Astronomy and Astrophysics
Astrophysics
Accepted for publication in The Astrophysical Journal, 18 ApJ preprint pages including 5 figures
Scientific paper
10.1086/425860
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.
Alcaniz Jailson S.
Lima Jose A. S.
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