Constraints on the cosmic expansion rate at redshift 2.3 from the Lyman-$α$ forest

Andrei Cuceu; Andreu Font-Ribera; Seshadri Nadathur; Benjamin Joachimi; Paul Martini

doi:10.1103/PhysRevLett.130.191003

paper

Constraints on the cosmic expansion rate at redshift 2.3 from the Lyman- $α$ forest

arXiv:2209.13942 · doi:10.1103/PhysRevLett.130.191003

Abstract

We determine the product of the expansion rate and angular-diameter distance at redshift $z = 2.3$ from the anisotropy of Lyman- $α$ (Ly $α$ ) forest correlations measured by the Sloan Digital Sky Survey (SDSS). Our result is the most precise from large-scale structure at $z > 1$ . In flat $Λ$ CDM we determine the matter density to be $Ω_{m} = 0.3 6_{- 0.04}^{+ 0.03}$ from Ly $α$ alone. This is a factor of two 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 $H_{0} = 63.2 \pm 2.5$ km/s/Mpc. In combination with other SDSS tracers, we find $H_{0} = 67.2 \pm 0.9$ km/s/Mpc and measure the dark energy equation-of-state parameter to be $w = - 0.90 \pm 0.12$ . Our work opens a new avenue for constraining cosmology at high redshift.

Constraints on the cosmic expansion rate at redshift 2.3 from the Lyman- $α$ forest

Abstract

References in corpus (17)

Cited by in corpus (19)

Constraints on the cosmic expansion rate at redshift 2.3 from the Lyman-α forest

Abstract

References in corpus (17)

Cited by in corpus (19)

Constraints on the cosmic expansion rate at redshift 2.3 from the Lyman- $α$ forest