Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-07-09
Astrophys.J. 619 (2005) 657
Astronomy and Astrophysics
Astrophysics
22 pages, 6 figures, submitted to ApJ, uses aastex preprint style
Scientific paper
10.1086/426665
We use recent measurements of the dimensionless coordinate distances from Fanaroff-Riley Type IIb radio galaxies and the X-ray gas mass fractions in clusters to constrain the parameters of a non-standard cosmological model. This work complements our recent analysis of the SN Ia data within a non-Riemannian cosmological model. We use two independent data sets to constrain the new density parameter $\Omega_\psi$, which is related to the non-Riemannian structure of the underlying spacetime and supplements the field equations that are very similar to the usual Friedmann equations of general relativity. Thereby we place an upper limit on the presence of non-Riemannian quantities in the late stages of the universe. The numerical results of this work also apply to several anisotropic cosmological models which, on the level of the field equations, exhibit a similar scaling behavior of the density parameters like our non-Riemannian model.
Pohl Martin
Puetzfeld Dirk
Zhu Zong-Hong
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