%0 Generic %1 cuceu2022constraints %A Cuceu, Andrei %A Font-Ribera, Andreu %A Nadathur, Seshadri %A Joachimi, Benjamin %A Martini, Paul %D 2022 %K library %T New constraints on the expansion rate at redshift 2.3 from the Lyman-$\alpha$ forest %U http://arxiv.org/abs/2209.13942 %X We measure the expansion rate of the Universe at redshift $z=2.3$ from the anisotropy of Lyman-$\alpha$ (Ly$\alpha$) 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 $Łambda$CDM we determine the matter density to be $Ømega_m=0.36^+0.03_-0.04$ from Ly$\alpha$ alone, a factor of two tighter than baryon acoustic oscillation results from the same data. Using a nucleosynthesis prior, we measure the Hubble constant to be $H_0=63.2\pm2.5$ km/s/Mpc. In combination with other SDSS tracers, we find $H_0=67.2\pm0.9$ km/s/Mpc and measure the dark energy equation-of-state parameter to be $w=-0.90\pm0.12$. Our work opens a new avenue for constraining cosmology at high redshift.

@misc{cuceu2022constraints, abstract = {We measure the expansion rate of the Universe at redshift $z=2.3$ from the anisotropy of Lyman-$\alpha$ (Ly$\alpha$) 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 $\Lambda$CDM we determine the matter density to be $\Omega_\mathrm{m}=0.36^{+0.03}_{-0.04}$ from Ly$\alpha$ alone, a factor of two tighter than baryon acoustic oscillation results from the same data. Using a nucleosynthesis prior, we measure the Hubble constant to be $H_0=63.2\pm2.5$ km/s/Mpc. In combination with other SDSS tracers, we find $H_0=67.2\pm0.9$ km/s/Mpc and measure the dark energy equation-of-state parameter to be $w=-0.90\pm0.12$. Our work opens a new avenue for constraining cosmology at high redshift.}, added-at = {2022-09-29T07:51:57.000+0200}, author = {Cuceu, Andrei and Font-Ribera, Andreu and Nadathur, Seshadri and Joachimi, Benjamin and Martini, Paul}, biburl = {https://www.bibsonomy.org/bibtex/20767a2ada52b3fe13e0fadc60dfaa8b4/gpkulkarni}, description = {New constraints on the expansion rate at redshift 2.3 from the Lyman-$\alpha$ forest}, interhash = {18d7e942c00be00a552e30c840f8f8b7}, intrahash = {0767a2ada52b3fe13e0fadc60dfaa8b4}, keywords = {library}, note = {cite arxiv:2209.13942Comment: Submitted to PRL}, timestamp = {2022-09-29T07:51:57.000+0200}, title = {New constraints on the expansion rate at redshift 2.3 from the Lyman-$\alpha$ forest}, url = {http://arxiv.org/abs/2209.13942}, year = 2022 }