Cuceu, Andrei; Font-Ribera, Andreu; Nadathur, Seshadri; Joachimi, Benjamin; Martini, Paul; (2023) Constraints on the Cosmic Expansion Rate at Redshift 2.3 from the Lyman-α Forest. Physical Review Letters , 130 (19) , Article 191003. 10.1103/physrevlett.130.191003.

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Abstract

We determine the product of the expansion rate and angular-diameter distance at redshift z ¼ 2.3 from the anisotropy of Lyman-α (Lyα) forest correlations measured by the Sloan Digital Sky Survey (SDSS). Our result is the most precise from large-scale structure at z > 1. Using the flat Λ cold dark matter model we determine the matter density to be Ωm ¼ 0.36þ0.03 −0.04 from Lyα alone. This is a factor of 2 tighter than baryon acoustic oscillation results from the same data due to our use of a wide range of scales (25 <r< 180 h−1 Mpc). Using a nucleosynthesis prior, we measure the Hubble constant to be H0 ¼ 63.2 2.5 km=s=Mpc. In combination with other SDSS tracers, we find H0 ¼ 67.2 0.9 km=s=Mpc and measure the dark energy equation-of-state parameter to be w ¼ −0.90 0.12. Our Letter opens a new avenue for constraining cosmology at high redshift.

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