来自星系Redshfit巡天的紧$H_0$约束：结合重子声振动测量和Alcock-Paczynski检验
Tight $H_0$ constraint from galaxy redshfit surveys: combining baryon acoustic osillation measurements and Alcock-Paczynski test
摘要：
本文报道了一个严格的哈勃常数约束$67.78^{+1.21}_{-1.86}$ km s $^{-1}$ Mpc $^{-1}$（精度为2.26%），它是由星系红移测量结果导出的.我们结合6dFGS、SDSS DR 7主星系、BOSS DR 12星系和eBOSS DR 14类星体的BAO测量数据，并将Alcock-Paczynski（AP）层析成像方法应用于BOSS DR 12星系，在空间平坦的$Λ$ CDM框架中对$H_0$进行约束。我们的结果与普朗克的CMB约束完全一致，但与Riess等人2016年的局部测量结果存在$2.58σ$张力。与单独的BAO约束相比，BAO+AP组合结果将误差棒减少了32%。这表明了层析AP方法在从星系红移巡天中提取宇宙学信息方面的强大能力。
英文摘要：
We report a tight Hubble constant constraint $67.78^{+1.21}_{-1.86}$ km s$^{-1}$ Mpc$^{-1}$ (2.26\% precision) derived from galaxy redshift surveys. We combine the BAO measurements from 6dFGS, the SDSS DR7 main galaxies, the BOSS DR12 galaxies, and eBOSS DR14 quasars, and also apply the tomographic Alcock-Paczynski (AP) method to the BOSS DR12 galaxies, to place constraints on $H_0$ in the spatially flat $Λ$CDM framework. Our result is fully consistent with the CMB constraints from Planck, but in $2.58σ$ tension with local measurements of Riess et al. 2016. Compared with the BAO alone constraint, the BAO+AP combined result reduces the error bar by 32%. This shows the strong power of the tomographic AP method in extracting cosmological information from galaxy redshift surveys.
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