DBI models for the unification of dark matter and dark energy
Cosmology and Nongalactic Astrophysics
2010-04-30 v2
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
Cite
@article{arxiv.0904.1114,
title = {DBI models for the unification of dark matter and dark energy},
author = {Luis P. Chimento and Ruth Lazkoz and Irene Sendra},
journal= {arXiv preprint arXiv:0904.1114},
year = {2010}
}
Comments
11 pages, 8 figures, revtex, new references