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An exotic dark component, named generalized Chaplygin gas (Cg) and parametrized by an equation of state p = -A/\ρCg\α where A and \α 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 investigate the prospects for constraining the Cg equation of state from measurements of the angular size of 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.
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Alcaniz et al. (2004) studied this question.
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