Abstract
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.
Cited by
3 articles.
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