CMB and BAO constraints for an induced gravity dark energy model with a quartic potential
Abstract
We study the predictions for structure formation in an induced gravity dark energy model with a quartic potential. By developing a dedicated EinsteinBoltzmann code, we study selfconsistently the dynamics of homogeneous cosmology and of linear perturbations without using any parametrization. By evolving linear perturbations with initial conditions in the radiation era, we accurately recover the quasistatic analytic approximation in the matter dominated era. We use PLANCK 2013 data and a compilation of baryonic acoustic oscillation (BAO) data to constrain the coupling γ to the Ricci curvature and the other cosmological parameters. By connecting the gravitational constant in the Einstein equation to the one measured in a Cavendishlike experiment, we find γ < 0.0012 at 95% CL with PLANCK 2013 and BAO data. This is the tightest cosmological constraint on γ and on the corresponding derived postNewtonian parameters. Because of a degeneracy between γ and the Hubble constant H_{0}, we show how larger values for γ are allowed, but not preferred at a significant statistical level, when local measurements of H_{0} are combined in the analysis with PLANCK 2013 data.
 Publication:

Journal of Cosmology and Astroparticle Physics
 Pub Date:
 August 2015
 DOI:
 10.1088/14757516/2015/08/017
 arXiv:
 arXiv:1507.00718
 Bibcode:
 2015JCAP...08..017U
 Keywords:

 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 13 pages, 7 figures