Papers › Constraints on the cosmic expansion rate at redshift 2.3 from the Lyman-α forest
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
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We determine the product of the expansion rate and angular-diameter distance at redshift z=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. In flat ΛCDM we determine the matter density to be Ωₘ=0.36^(+0.03)_(-0.04) from Lyα 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⁻¹Mpc). Using a nucleosynthesis prior, we measure the Hubble constant to be H₀=63.2±2.5 km/s/Mpc. In combination with other SDSS tracers, we find H₀=67.2±0.9 km/s/Mpc and measure the dark energy equation-of-state parameter to be w=-0.90±0.12. Our work opens a new avenue for constraining cosmology at high redshift.
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