论文标题
来自星系分布观测的低哈勃常数
A low Hubble Constant from galaxy distribution observations
论文作者
论文摘要
对哈勃常数的准确确定仍然是观察宇宙学的难题。新物理学的可能性已经出现，在我们的宇宙的当前膨胀速率之间具有显着的张力，该宇宙的当前膨胀率是通过普朗克卫星和局部方法从宇宙微波背景测得的。在本文中，通过考虑来自星系分布观测值的两个数据集获得了有关此参数的新紧密估计：星系簇气体质量分数和Baryon声学振荡测量值。还考虑了大爆炸核合成（BBN）的先验。 By considering the flat $Λ$CDM and XCDM models, and the non-flat $Λ$CDM model, our main results are: $H_0=65.9^{+1.5}_{-1.5}$ km s$^{-1}$ Mpc$^{-1}$, $H_0=65.9^{+4.4}_{-4.0}$ km s $^{ - 1} $ mpc $^{ - 1} $和$ h_0 = 64.3^{+ 4.5} _ { - 4.4} $ km s $ s $^{ - 1} $ mpc $^{ - 1} $分别为$2σ$ c.l.这些估计与普朗克卫星结果完全一致。在这些宇宙学场景中，我们的分析也支持减速参数的负值，至少在3 $σ$ c.l中。
An accurate determination of the Hubble constant remains a puzzle in observational cosmology. The possibility of a new physics has emerged with a significant tension between the current expansion rate of our Universe measured from the cosmic microwave background by the Planck satellite and from local methods. In this paper, new tight estimates on this parameter are obtained by considering two data sets from galaxy distribution observations: galaxy cluster gas mass fractions and baryon acoustic oscillation measurements. Priors from the Big Bang nucleosynthesis (BBN) were also considered. By considering the flat $Λ$CDM and XCDM models, and the non-flat $Λ$CDM model, our main results are: $H_0=65.9^{+1.5}_{-1.5}$ km s$^{-1}$ Mpc$^{-1}$, $H_0=65.9^{+4.4}_{-4.0}$ km s$^{-1}$ Mpc$^{-1}$ and $H_0=64.3^{+ 4.5}_{- 4.4}$ km s$^{-1}$ Mpc$^{-1}$ in $2σ$ c.l., respectively. These estimates are in full agreement with the Planck satellite results. Our analyses in these cosmological scenarios also support a negative value for the deceleration parameter at least in 3$σ$ c.l..
