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

Abstract

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.

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

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Cited by in corpus (19)

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• Does Chaplygin gas have salvation?
• Phantom dark energy as an effect of bulk viscosity
• Observational Constraints on Modified Chaplygin Gas from Cosmic Growth
• Confronting the relaxation mechanism for a large cosmological constant with observations
• Structure formation in a $\Lambda$ $viscous$ CDM universe
• Late-Time Viscous Cosmology in $f(R,T)$ Gravity
• Crossing the phantom divide with dissipative normal matter in the Israel-Stewart-Hiscock formalism
• Non-adiabatic Chaplygin gas
• Cosmology from a new non-conservative gravity
• Viscous cosmology in $f(T)$ gravity
• The Chaplygin gas as a model for modified teleparallel gravity?
• Generalized models of unification of dark matter and dark energy
• Spherical collapse for unified dark matter models
• Dissipative Unified Dark Fluid Model
• Observational constraints to a unified cosmological model