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arXiv 2008.08084astro-ph.COastro-ph.GAastro-ph.IMgr-qchep-ph
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确定没有声视界的哈勃常数：星系巡天测量

Determining the Hubble Constant without the Sound Horizon: Measurements from Galaxy Surveys

Oliver H. E. Philcox, Blake D. Sherwin, Gerrit S. Farren, Eric J. Baxter

备注：
8 pages, 4 figures, accepted by Phys. Rev. D
发表信息：
Phys. Rev. D 103, 023538 (2021)
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摘要：

两个来源的几何信息编码在星系的功率谱：在重组的声音视界和视界的物质辐射平等。分析BOSS DR 12星系的功率谱使用微扰理论与$Ω_m$先验从万神殿超新星，但没有先验的$Ω_b$，我们得到的约束$H_0$从第二个规模，发现$H_0 = 65.1^{+3.0}_{-5.4}\,\mathrm{km}\,\mathrm{s}^{-1}\mathrm{Mpc}^{-1}$，这不同于最佳拟合的SH0 ES在95\%的置信度。如果$Ω_m$受未校准BAO：$H_0 = 65.6^{+3.4}_{-5.5}\,\mathrm{km}\,\mathrm{s}^{-1}\mathrm{Mpc}^{-1}$的约束，则获得类似的结果。添加Baxter \& Sherwin 2020的类似透镜效应结果，后验转换为$70.6^{+3.7}_{-5.0}\,\mathrm{km}\,\mathrm{s}^{-1}\mathrm{Mpc}^{-1}$。使用模拟数据，Fisher分析，和规模削减，我们证明了我们的约束条件没有收到显着的信息，从健全的地平线规模。由于许多模型解决了$H_0$的争议，通过添加新的物理来改变声音视界，我们的测量是标准宇宙学在重组之前的一致性测试。一个简单的预测表明，这样的约束可能会达到欧几里德时代的$σ_{H_0} \simeq 1.6\,\mathrm{km}\,\mathrm{s}^{-1}\mathrm{Mpc}^{-1}$。

英文摘要：

Two sources of geometric information are encoded in the galaxy power spectrum: the sound horizon at recombination and the horizon at matter-radiation equality. Analyzing the BOSS DR12 galaxy power spectra using perturbation theory with $Ω_m$ priors from Pantheon supernovae but no priors on $Ω_b$, we obtain constraints on $H_0$ from the second scale, finding $H_0 = 65.1^{+3.0}_{-5.4}\,\mathrm{km}\,\mathrm{s}^{-1}\mathrm{Mpc}^{-1}$; this differs from the best-fit of SH0ES at 95\% confidence. Similar results are obtained if $Ω_m$ is constrained from uncalibrated BAO: $H_0 = 65.6^{+3.4}_{-5.5}\,\mathrm{km}\,\mathrm{s}^{-1}\mathrm{Mpc}^{-1}$. Adding the analogous lensing results from Baxter \& Sherwin 2020, the posterior shifts to $70.6^{+3.7}_{-5.0}\,\mathrm{km}\,\mathrm{s}^{-1}\mathrm{Mpc}^{-1}$. Using mock data, Fisher analyses, and scale-cuts, we demonstrate that our constraints do not receive significant information from the sound horizon scale. Since many models resolve the $H_0$ controversy by adding new physics to alter the sound horizon, our measurements are a consistency test for standard cosmology before recombination. A simple forecast indicates that such constraints could reach $σ_{H_0} \simeq 1.6\,\mathrm{km}\,\mathrm{s}^{-1}\mathrm{Mpc}^{-1}$ in the era of Euclid.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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