Contraints on unified models for dark matter and dark energy using H(z)

Details Contraints on unified models for dark matter and dark energy using H(z) Contraints on unified models for dark matter and dark energy using H(z)

2011-06-03

arxiv.org/abs/1106.0645v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Latex file, 10 pages, 19 figures in eps format. Accepted for publication in European Journal of Physics C

Scientific paper

The differential age data of astrophysical objects that have evolved passivelly during the history of the universe (e.g. red galaxies) allows to test theoretical cosmological models through the predicted Hubble function expressed in terms of the redshift $z$, $H(z)$. We use the observational data for $H(z)$ to test unified scenarios for dark matter and dark energy. Specifically, we focus our analysis on the Generalized Chaplygin Gas (GCG) and the viscous fluid (VF) models. For the GCG model, it is shown that the unified scenario for dark energy and dark matter requires some priors. For the VF model we obtain estimations for the free parameters that may be compared with further analysis mainly at perturbative level.

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