Limits on Clustering and Smooth Quintessence from the EFTofLSS
Abstract
We apply the Effective Field Theory of Large-Scale Structure (EFTofLSS) to analyze cosmological models with clustering quintessence, which allows us to consistently describe the parameter region in which the quintessence equation of state w < - 1. First, we extend the description of biased tracers in redshift space to the presence of clustering quintessence, and compute the one-loop power spectrum. We solve the EFTofLSS equations using the exact time dependence, which is relevant to obtain unbiased constraints. Then, fitting the full shape of BOSS pre-reconstructed power spectrum measurements, the BOSS post-reconstruction BAO measurements, BAO measurements from 6DF/MGS and eBOSS, the Supernovae from Pantheon, and a prior from BBN, we bound the clustering quintessence equation of state parameter w=-1.011-0.048+0.053 at 68\% C.L.. Further combining with Planck, we obtain w=-1.028-0.030+0.037 at 68\% C.L.. We also obtain constraints on smooth quintessence, in the physical regime w ≥ -1: combining all datasets, we get -1≤ w < - 0.979 at 68\% C.L.. These results strongly support a cosmological constant.