The angular size - redshift relation in power-law cosmologies

Details The angular size - redshift relation in power-law cosmologies The angular size - redshift relation in power-law cosmologies

2003-02-03

arxiv.org/abs/astro-ph/0302025v2

Class.Quant.Grav. 20 (2003) 4485-4494

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, LaTeX

Scientific paper

10.1088/0264-9381/20/20/311

A linear evolution of the cosmological scale factor is a feature in several models designed to solve the cosmological constant problem via a coupling between scalar or tensor classical fields to the space-time curvature as well as in some alternative gravity theories. In this paper, by assuming a general time dependence of the scale factor, $R \sim t^{\alpha}$, we investigate observational constraints on the dimensionless parameter $\alpha$ from measurements of the angular size for a large sample of milliarcsecond compact radio sources. In particular, we find that a strictly linear evolution, i.e., $\alpha \simeq 1$ is favoured by these data, which is also in agreement with limits obtained from other independent cosmological tests. The dependence of the critical redshift $z_m$ (at which a given angular size takes its minimal value) with the index $\alpha$ is briefly discussed.

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