General Relativity and Gravitation

, Volume 42, Issue 5, pp 1189–1209

DBI models for the unification of dark matter and dark energy

Authors

  • Luis P. Chimento
    • Departamento de FísicaUniversidad de Buenos Aires
    • Fisika Teorikoa, Zientzia eta Teknologia FakultateaEuskal Herriko Unibertsitatea
  • Irene Sendra
    • Fisika Teorikoa, Zientzia eta Teknologia FakultateaEuskal Herriko Unibertsitatea
Research Article

DOI: 10.1007/s10714-009-0901-z

Cite this article as:
Chimento, L.P., Lazkoz, R. & Sendra, I. Gen Relativ Gravit (2010) 42: 1189. doi:10.1007/s10714-009-0901-z

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 energyDark matterCosmological perturbationsGeometrical constraintsDBI Lagrangians
Download to read the full article text

Copyright information

© Springer Science+Business Media, LLC 2009