What does this research mean for the field?

Using the Effective Field Theory of Large-Scale Structure, the dark energy equation of state parameter w is constrained to -1.046_{-0.052}^{+0.055} independently of the CMB, and -1.023_{-0.030}^{+0.033} when including Planck CMB data. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

January 4, 2021Open Access

Limits on wCDM from the EFTofLSS with the PyBird code

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Abstract

We apply the Effective Field Theory of Large-Scale Structure to analyze the wCDM cosmological model. By using the full shape of the power spectrum and the BAO post-reconstruction measurements from BOSS, the Supernovae from Pantheon, and a prior from BBN, we set the competitive CMB-independent limit w=-1. 046-₀. ₀₅₂^+0. 055 at 68\% C. L. . After adding the Planck CMB data, we find w=-1. 023-₀. ₀₃₀^+0. 033 at 68\% C. L. . Our results are obtained using PyBird, a new, fast Python-based code which we make publicly available.

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