论文标题
哈勃常数和声音的近期宇宙
Hubble constant and sound horizon from the late-time Universe
论文作者
论文摘要
我们从低偏移数据中测量了最近宇宙的膨胀速率和Baryon声学振荡（BAO）的校准量表。 BAO依赖于校准量表，即，在Drag Epoch $ r_d $末尾的声音范围，它通常从Planck卫星中施加了宇宙微波背景（CMB）测量的先验。为了实现$ H_0 $的真正独立测量，我们将$ r_d $完全免费，并使用BAO数据集与31观察性$ h（z）$数据，GW170817和IA型超级新闻的Pantheon样本相结合。在$λ$ CDM型号中，我们得到$ H_0 = 68.63^{+1.75} _ { - 1.77} $ km s $ s $^{ - 1} $ mpc $^{ - 1} $，$ r_d = 146.85^{+3.29} _ {+3.29} _ { - 3.77} $ mpc。对于$ h（z）$的两个独立于模型的重建，我们获得$ h_0 = 68.02 \ pm1.82 $ km s $ s $^{ - 1} $ mpc $^{ - 1} $，$ r_d = 148.18^{+3.36} _ {+3.36} _ {-3.78} $ MPC $ h_0 = 68.58 \ pm1.76 $ km s $^{ - 1} $ mpc $^{ - 1} $，$ r_d = 148.02^{+3.63} _ { - 3.60} $ mpc in the polynomial扩展。 Hubble常数$ H_0 $和SOUND HORIZON $ R_D $的值与从Planck CMB数据得出的估计值是一致的，假设$λ$ CDM型号，但是$ H_0 $分别为$ 2.4 \ sim2.6 $ $σ$ timperss Sh0es 2019。
We measure the expansion rate of the recent Universe and the calibration scale of the baryon acoustic oscillation (BAO) from low-redshift data. BAO relies on the calibration scale, i.e., the sound horizon at the end of drag epoch $r_d$, which often imposes a prior of the cosmic microwave background (CMB) measurement from the Planck satellite. In order to make really independent measurements of $H_0$, we leave $r_d$ completely free and use the BAO data sets combined with the 31 observational $H(z)$ data, GW170817 and Pantheon sample of Type Ia supernovae. In $Λ$CDM model, we get $H_0=68.63^{+1.75}_{-1.77}$ km s$^{-1}$ Mpc$^{-1}$, $r_d=146.85^{+3.29}_{-3.77}$ Mpc. For the two model-independent reconstructions of $H(z)$, we obtain $H_0=68.02\pm1.82$ km s$^{-1}$ Mpc$^{-1}$, $r_d=148.18^{+3.36}_{-3.78}$ Mpc in the cubic expansion, and $H_0=68.58\pm1.76$ km s$^{-1}$ Mpc$^{-1}$, $r_d=148.02^{+3.63}_{-3.60}$ Mpc in the polynomial expansion. The values of Hubble constant $H_0$ and sound horizon $r_d$ are consistent with the estimate derived from the Planck CMB data assuming a flat $Λ$CDM model, but $H_0$ is in $2.4\sim2.6$ $σ$ tension with SH0ES 2019, respectively.
