A critical-density closed Universe in Brans-Dicke theory
arXiv:astro-ph/0005002 · doi:10.1046/j.1365-8711.2000.03675.x
Abstract
In a Brans-Dicke (BD) cosmological model, the energy density associated with some scalar field decreases as $\displaystyle a^{{-2}(\frac{ω_{o}+ {\frac12}%}{ω_{o}+1})} $ with the scale factor of the Universe, giving a matter with an Equation of state . In this model, the Universe could be closed but still have a nonrelativistic-matter density corresponding to its critical value, . Different cosmological expressions, such as, luminosity distance, angular diameter, number count and ratio of the redshift tickness-angular size, are determined in terms of the redshift for this model.
To appear in MNRAS, 7 pages, 5 eps figures