We determine the product of the expansion rate and angular-diameter distance at redshift from the anisotropy of Lyman- () forest correlations measured by the Sloan Digital Sky Survey (SDSS). Our result is the most precise from large-scale structure at . Using the flat cold dark matter model we determine the matter density to be from 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 (). Using a nucleosynthesis prior, we measure the Hubble constant to be . In combination with other SDSS tracers, we find and measure the dark energy equation-of-state parameter to be . Our Letter opens a new avenue for constraining cosmology at high redshift.
- Received 28 September 2022
- Revised 23 December 2022
- Accepted 9 February 2023
© 2023 American Physical Society
Gravitation, Cosmology & Astrophysics