Papers › BOSS full-shape analysis from the EFTofLSS with exact time dependence
BOSS full-shape analysis from the EFTofLSS with exact time dependence
Pierre Zhang, Yifu Cai
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We re-analyze the full shape of BOSS galaxy two-point function from the Effective-Field Theory of Large-Scale Structure at the one loop within ΛCDM with massive neutrinos using a big bang nucleosynthesis (BBN) prior, removing the Einstein-de Sitter (EdS) approximation in the time dependence of the loop, and, properly accounting for the redshift selection over the BOSS samples instead of assuming an effective redshift. We constrain, at 68%-confidence level (CL), the present-day matter fraction to Ωₘ=0.322 ±0.018, the Hubble constant to H₀=69.1±0.14 (km/s)/Mpc, the log-amplitude of the primordial spectrum to ln(10¹⁰ Aₛ) = 2.97 ±0.25, the spectral tilt to nₛ = 0.938 ±0.082, and bound the total neutrino mass to <1.1 at 95%-CL. We find no significant shift in the posteriors of the cosmological parameters due to the EdS approximation, but a marginal difference in ln(10¹⁰ Aₛ) due to the effective redshift approximation of about 0.4σ, where σ is the 68%-confidence interval. Regarding the EdS approximation, we check that the same conclusion holds on simulations of volume like DESI in ΛCDM and $w$CDM, with a BBN prior. In contrast, for an approximate, effective redshift, to be assumed, we advocate systematic assessments on redshift selection for ongoing and future large-volume surveys.
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