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arXiv 1909.05271astro-ph.COgr-qchep-phhep-th
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大尺度结构有效场论SDSS/BOSS数据的宇宙学分析

The Cosmological Analysis of the SDSS/BOSS data from the Effective Field Theory of Large-Scale Structure

Guido D'Amico, Jérôme Gleyzes, Nickolas Kokron, Dida Markovic, Leonardo Senatore, Pierre Zhang, Florian Beutler, Héctor Gil-Marín

摘要:

大尺度结构的有效场论(Effective Field Theory of Large-Scale Structure,EFTofLSS)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学大尺度结构在轻度非线性状态下的成簇。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,一个固定值的重子/暗物质的比例,$Ω_b/Ω_c$,和倾斜的原始功率谱,$n_s$,并没有显着的输入从数值模拟。利用单圈功率谱多极子,测量功率谱的原始振幅$A_s$、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68%置信水平下的$\ln(10^{10}As)=2.72\pm 0.13$、$Ω_m=0.309\pm 0.010$、$H_0=68.5\pm 2.2$ km/(s Mpc)。如果我们随后在声音水平线上添加CMB先验,则$H_0$上的误差条减小到$1.6\%$。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,提取宇宙学信息的大尺度结构。

英文摘要:

The Effective Field Theory of Large-Scale Structure (EFTofLSS) 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 $Λ$CDM, a fixed value of the baryon/dark-matter ratio, $Ω_b/Ω_c$, 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, $Ω_m$, and the Hubble parameter, $H_0$, to about $13\%$, $3.2\%$ and $3.2\%$ respectively, obtaining $\ln(10^{10}As)=2.72\pm 0.13$, $Ω_m=0.309\pm 0.010$, $H_0=68.5\pm 2.2$ 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.

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