论文标题
从莱曼（Lyman）$ $α$ forest的红移2.3处的宇宙膨胀率的限制
Constraints on the cosmic expansion rate at redshift 2.3 from the Lyman-$α$ forest
论文作者
论文摘要
我们确定了从莱曼（Lyman-$ lyman- $α$（ly $α$）森林相关性）从Sloan Digital Sky Survey（SDSS）测得的Lyman-$ lyman- $α$（ly $α$）的膨胀速率和角直径距离的乘积。我们的结果是$ z> 1 $的大规模结构中最精确的结果。在flat $λ$ CDM中，我们确定物质密度为$ω_\ MATHRM {M} = 0.36^{+0.03} _ { - 0.04} $，来自ly $ ly $α$。由于我们使用了广泛的量表（$ 25 <r <180 $ $ $ $ h^{ - 1} \ text {mpc} $），这比巴里昂声学振荡更紧张。使用核合成之前，我们测量哈勃常数为$ h_0 = 63.2 \ pm2.5 $ km/s/mpc。结合其他SDSS示踪剂，我们发现$ H_0 = 67.2 \ pm0.9 $ km/s/mpc，并测量黑暗能源方程参数为$ W = -0.90 \ pm0.12 $。我们的工作开辟了一条新的途径，以限制高红移。
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 $Ω_\mathrm{m}=0.36^{+0.03}_{-0.04}$ 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 ($25<r<180$ $h^{-1}\text{Mpc}$). 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.
