Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-04-28
Mon.Not.Roy.Astron.Soc. 317 (2000) 825
Astronomy and Astrophysics
Astrophysics
To appear in MNRAS, 7 pages, 5 eps figures
Scientific paper
10.1046/j.1365-8711.2000.03675.x
In a Brans-Dicke (BD) cosmological model, the energy density associated with some scalar field decreases as $\displaystyle a^{{-2}(\frac{\omega_{o}+ {\frac12}%}{\omega_{o}+1})} $ with the scale factor $a(t)$ of the Universe, giving a matter with an Equation of state $\displaystyle p=-{1/3}(\frac{2+\omega_{o}}{1+\omega_{o}}) \rho $. In this model, the Universe could be closed but still have a nonrelativistic-matter density corresponding to its critical value, $\Omega_{o}=1$. 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.
Cruz Norman
del Campo Sergio
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