Constraints on unified models for dark matter and dark energy using <Emphasis Type="Italic">H</Emphasis>(<Emphasis Type="Italic">z</Emphasis>) |
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Authors: | Júlio C Fabris Paulo L C de Oliveira Hermano Velten |
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Institution: | 1.Departamento de Física,Universidade Federal do Espírito Santo,Vitória,Brazil;2.Fakult?t für Physik,Universit?t Bielefeld,Bielefeld,Germany |
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Abstract: | 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. |
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Keywords: | |
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