General Relativity and Gravitation

, Volume 42, Issue 5, pp 1189–1209 | Cite as

DBI models for the unification of dark matter and dark energy

Research Article

Abstract

We propose a model based on a DBI action for the unification of dark matter and dark energy. This is supported by the results of the study of its background behavior at early and late times, and reinforced by the analysis of the evolution of perturbations. We also perform a Bayesian analysis to set observational constraints on the parameters of the model using type Ia SN, CMB shift and BAO data. Finally, to complete the study we investigate its kinematics aspects, such as the effective equation of state parameter, acceleration parameter and transition redshift. Particularizing those parameters for the best fit one appreciates that an effective phantom is preferred.

Keywords

Dark energy Dark matter Cosmological perturbations Geometrical constraints DBI Lagrangians 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.Departamento de FísicaUniversidad de Buenos AiresBuenos AiresArgentina
  2. 2.Fisika Teorikoa, Zientzia eta Teknologia FakultateaEuskal Herriko UnibertsitateaBilbaoSpain

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