2009/04/29 by Luis P. Chimento, Ruth Lazkoz, Irene Sendra
Physics and Astronomy · #Acceleration #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark fluid #Dark matter #Deceleration parameter #Equation of state #Kinematics #Particle physics theoretical and experimental studies #Unification #astro-ph.CO
paper · pdf · doi:10.1007/s10714-009-0901-z
published as Gen.Rel.Grav.42:1189-1209,2010 · 11 pages, 8 figures, revtex, new references
arxiv created 2009/04/29 · openalex publication_date 2009/10/29 · arxiv updated 2010/04/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.