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

• Published in: The European physical journal. C, Particles and fields Vol. 71; no. 10; pp. 1 - 8
• Main Authors: Fabris, Júlio C., de Oliveira, Paulo L. C., Velten, Hermano
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01-10-2011; Springer; Springer Nature B.V
• Subjects: Analysis; Astronomical models; Astronomy; Astrophysics and Cosmology; Chaplygin gas; Constraint modelling; Cosmology; Dark energy; Dark matter; Elementary Particles; Exact sciences and technology; Force and energy; Galactic evolution; Galaxies; Hadrons; Heavy Ions; Mathematical models; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Parameter estimation; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Red shift; Regular Article - Theoretical Physics; String Theory; The physics of elementary particles and fields; Universe; Viscous fluids; Dark Sector; Perturbative Analysis; Background Dynamic; Dark Energy; Dark Matter; Red shift; Galaxies; Theoretical model; Dark matter; Unified model; Elementary particles; Cosmology; Fluid models; Dark energy; Viscous fluids; Age; Cosmological models; Mathematical physics
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-011-1773-4

The differential age data of astrophysical objects that have evolved passively during the history of the universe (e.g. red galaxies) allows us 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, which may be compared with further analysis mainly at perturbative level.