论文标题
在没有声音范围的情况下确定哈勃常数:$ 3.6 \%$限制$ h_0 $从Galaxy Surveys,CMB镜头和超新星。
Determining the Hubble Constant without the Sound Horizon: A $3.6\%$ Constraint on $H_0$ from Galaxy Surveys, CMB Lensing and Supernovae
论文作者
论文摘要
所谓的“哈勃张力”的许多理论解决方案都依赖于重组时修改声音范围,$ r_s $,因此在宇宙微波背景(CMB)和大型结构(LSS)数据集中用作标准尺度的声学量表。如最近的许多作品中所示,这些可观察的物品还可以用于计算$ r_s $独立于$ H_0 $的约束,通过在物质辐射平等上使用地平线量表,$ k _ {\ rm eq} $,对高红色Shift Physics的敏感性不同。因此,$ r_s $ - 和$ k _ {\ rm eq} $ - 基于$ h_0 $的测量值(在$λ$ CDM框架内)可能会有所不同,如果有新的物理学当前的预聚类。在这项工作中,我们从当前数据中介绍了后者对后者的最严格约束,找到$ H_0 = 64.8^{+2.2} _ { - 2.5} $ 68%Cl(in $ \ \ \ m atrm {km} \,\ \ \ m mathrm {s}}功率谱,Planck CMB镜头和新发布的万神殿+超新星约束,以及巴里昂密度,中微子质量和光谱指数的物理先验。 Boss和Planck的测量值不同,导致了改进的组合约束,其限制为$ H_0 = 67.1^{+2.5} _ { - 2.9} $($ 63.6^{+2.9} _ { - 3.6} _ { - 3.6} $)。 The results show some dependence on the neutrino mass bounds, with the constraint broadening to $H_0 = 68.0^{+2.9}_{-3.2}$ if we instead impose a weak prior on $\sum m_ν$ from terrestrial experiments, or shifting to $H_0 = 64.6\pm2.4$ if the neutrino mass is fixed to its minimal value.即使不依赖声音范围,我们的结果均以$ \3σ$的张力与从CepheId校准的距离梯子获得的结果,这开始引起新的物理模型的问题,这些新物理模型通过更改声学物理或重新组合之前的膨胀历史而变化$ H_0 $。
Many theoretical resolutions to the so-called "Hubble tension" rely on modifying the sound horizon at recombination, $r_s$, and thus the acoustic scale used as a standard ruler in the cosmic microwave background (CMB) and large scale structure (LSS) datasets. As shown in a number of recent works, these observables can also be used to compute $r_s$-independent constraints on $H_0$ by making use of the horizon scale at matter-radiation equality, $k_{\rm eq}$, which has different sensitivity to high redshift physics than $r_s$. As such, $r_s$- and $k_{\rm eq}$-based measurements of $H_0$ (within a $Λ$CDM framework) may differ if there is new physics present pre-recombination. In this work, we present the tightest constraints on the latter from current data, finding $H_0=64.8^{+2.2}_{-2.5}$ at 68% CL (in $\mathrm{km}\,\mathrm{s}^{-1}\mathrm{Mpc}^{-1}$ units) from a combination of BOSS galaxy power spectra, Planck CMB lensing, and the newly released Pantheon+ supernova constraints, as well as physical priors on the baryon density, neutrino mass, and spectral index. The BOSS and Planck measurements have different degeneracy directions, leading to the improved combined constraints, with a bound of $H_0 = 67.1^{+2.5}_{-2.9}$ ($63.6^{+2.9}_{-3.6}$) from BOSS (Planck) alone. The results show some dependence on the neutrino mass bounds, with the constraint broadening to $H_0 = 68.0^{+2.9}_{-3.2}$ if we instead impose a weak prior on $\sum m_ν$ from terrestrial experiments, or shifting to $H_0 = 64.6\pm2.4$ if the neutrino mass is fixed to its minimal value. Even without dependence on the sound horizon, our results are in $\approx 3σ$ tension with those obtained from the Cepheid-calibrated distance ladder, which begins to cause problems for new physics models that vary $H_0$ by changing acoustic physics or the expansion history immediately prior to recombination.