The cosmological analysis of the SDSS/BOSS data from the Effective Field Theory of Large-Scale Structure
The cosmological analysis of the SDSS/BOSS data from the Effective Field Theory of Large-Scale Structure
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DOI：
10.1088/1475-7516/2020/05/005
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发表时间：
2020-05-01
影响因子：
6.4
通讯作者：
Gil-Marin, Hector
中科院分区：
文献类型：
--
作者：
d'Amico, Guido;Gleyzes, Jerome;Gil-Marin, Hector
大尺度结构的有效场论是一种形式主义，它使我们能够以一种准确可靠的方式预测宇宙大尺度结构在轻度非线性区域中的聚集。在对几组数值模拟验证了我们的技术后，我们对DR 12 BOSS数据的宇宙学参数进行了分析。我们假设λ CDM是重子/暗物质比率Ω（B）/Ω（c）和原始功率谱倾斜度n（s）的固定值，并且没有来自数值模拟的重要输入。利用单圈功率谱多极子，我们测量了功率谱的原始振幅A（s）、物质丰度Ω（m）和哈勃参数H-0，分别约为13%、3.2%和3.2%，得到ln（10（10）A（s））= 2.72 +/- 0.13，Ω（m）= 0.309 +/- 0.010，H-0 = 68.5 +/- 2.2 km/（s Mpc），置信水平为68%。如果我们在声音水平线上添加CMB先验，则H-0上的误差条减少到1.6%。这些结果是一个实质性的定性和定量的改进，相对于以前的分析，并建议EFTofLSS是一个强大的工具，以提取宇宙学信息的大尺度结构。
The Effective Field Theory of Large-Scale Structure is a formalism that allows us to predict the clustering of Cosmological Large-Scale Structure in the mildly non-linear regime in an accurate and reliable way. After validating our technique against several sets of numerical simulations, we perform the analysis for the cosmological parameters of the DR12 BOSS data. We assume Lambda CDM, a fixed value of the baryon/dark-matter ratio, Omega(b)/Omega(c), and of the tilt of the primordial power spectrum, n(s), and no significant input from numerical simulations. By using the one-loop power spectrum multipoles, we measure the primordial amplitude of the power spectrum, A(s), the abundance of matter, Omega(m), and the Hubble parameter, H-0, to about 13%, 3.2% and 3.2% respectively, obtaining ln(10(10)A(s)) = 2.72 +/- 0.13, Omega(m )= 0.309 +/- 0.010, H-0 = 68.5 +/- 2.2 km/(s Mpc) at 68% confidence level. If we then add a CMB prior on the sound horizon, the error bar on H-0 is reduced to 1.6%. These results are a substantial qualitative and quantitative improvement with respect to former analyses, and suggest that the EFTofLSS is a powerful instrument to extract cosmological information from Large-Scale Structure.