Cardassian Expansion: Constraints from Compact Radio Source Angular Size versus Redshift Data

Details Cardassian Expansion: Constraints from Compact Radio Source Angular Size versus Redshift Data Cardassian Expansion: Constraints from Compact Radio Source Angular Size versus Redshift Data

2002-12-09

arxiv.org/abs/astro-ph/0212192v1

Astrophys.J. 581 (2002) 1-4

Astronomy and Astrophysics

Astrophysics

2 figures, 1 table, uses aastex

Scientific paper

10.1086/344171

The ``Cardassian Expansion Scenario'' was recently proposed by Freese and Lewis (2002) as an alternative to a cosmological constant in explaining the current accelerating universe. In this paper we investigate observational constraints on this scenario from recent measurements of the angular size of high-$z$ compact radio sources compiled by Gurvits et al. (1999). We show that the allowed intervals for $n$ and $z_{eq}$, the two parameters of the Cardassian model, are heavily dependent on the value of the mean projected linear size $l$. However, the best fit to the current angular size data prefers the conventional flat $\Lambda$CDM model to this Cardassian expansion proposal, though the latter is cosmologically credible and compatible with the $\Theta - z$ diagram for some values of $l$.

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