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

  • Júlio C. Fabris
  • Paulo L. C. de Oliveira
  • Hermano VeltenEmail author
Regular Article - Theoretical Physics

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.

Keywords

Dark Matter Dark Energy Dark Sector Background Dynamic Perturbative Analysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag / Società Italiana di Fisica 2011

Authors and Affiliations

  • Júlio C. Fabris
    • 1
  • Paulo L. C. de Oliveira
    • 1
  • Hermano Velten
    • 1
    • 2
    Email author
  1. 1.Departamento de FísicaUniversidade Federal do Espírito SantoVitóriaBrazil
  2. 2.Fakultät für PhysikUniversität BielefeldBielefeldGermany

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