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 EFT and designer f ( R ) models , both on \Lambda CDM and w CDM background expansion histories , using data from Planck temperature and lensing potential spectra , WMAP low- \ell polarization spectra ( WP ) , and baryon acoustic oscillation ( BAO ) .
Upon inspecting theoretical stability of the models on the given background , we find non-trivial 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 w CDM background case this 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 } \in ( -1 , -0.9997 ) ( 95 \% { C . L . } ) .