Effective field theory of cosmic acceleration: Constraining dark energy with CMB data
Abstract
We introduce EFTCAMB/EFTCosmoMC as publicly available patches to the commonly used camb/CosmoMC codes. We briefly describe the structure of the codes, their applicability and main features. To illustrate the use of these patches, we obtain constraints on parametrized pure effective field theory and designer f(R) models, both on ΛCDM and wCDM background expansion histories, using data from Planck temperature and lensing potential spectra, WMAP lowℓ polarization spectra (WP), and baryon acoustic oscillations (BAO). Upon inspecting the theoretical stability of the models on the given background, we find nontrivial parameter spaces that we translate into viability priors. We use different combinations of data sets to show their individual effects on cosmological and model parameters. Our data analysis results show that, depending on the adopted data sets, in the wCDM background case these viability priors could dominate the marginalized posterior distributions. Interestingly, with Planck +WP+BAO+lensing data, in f(R) gravity models, we get very strong constraints on the constant dark energy equation of state, w_{0}∈(1,0.9997) (95% C.L.).
 Publication:

Physical Review D
 Pub Date:
 August 2014
 DOI:
 10.1103/PhysRevD.90.043513
 arXiv:
 arXiv:1405.1022
 Bibcode:
 2014PhRvD..90d3513R
 Keywords:

 98.80.k;
 98.80.Cq;
 Cosmology;
 Particletheory and fieldtheory models of the early Universe;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 12 pages, 3 figures, 2 tables. Matching version accepted by PRD. The EFTCAMB/EFTCosmoMC codes are available at: http://wwwhome.lorentz.leidenuniv.nl/~hu/codes/