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arXiv 2302.06808astro-ph.CO
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利用BOSS DR12星系的各向异性三点相关函数对宇宙学修改引力理论的新约束

New constraints on cosmological modified gravity theories from anisotropic three-point correlation functions of BOSS DR12 galaxies

Naonori S. Sugiyama, Daisuke Yamauchi, Tsutomu Kobayashi, Tomohiro Fujita, Shun Arai, Shin'ichi Hirano, Shun Saito, Florian Beutler, Hee-Jong Seo

AI总结:

本研究首次将星系两点和三点相关函数各向异性分量的联合分析用于BOSS DR12数据,约束DHOST理论的宇宙学非线性效应,得到的参数约束与广义相对论一致且精度显著提升,还发布了开源分析代码\textsc{HITOMI}。

摘要:

我们报告了一项利用宇宙大尺度结构检验修改引力理论的新研究。本文首次尝试两项工作:一是将星系两点和三点相关函数(2PCF和3PCF)的各向异性分量联合分析应用于实际星系数据,二是约束简并高阶标量-张量(DHOST)理论在宇宙学尺度上的非线性效应。将该分析应用于重子振荡光谱巡天(BOSS)第12次数据发布(DR12)的数据集,我们得到表征二阶速度场潮汐项和位移项时间演化的参数在95%置信水平下的下界:$-1.655 < ξ_{\rm t}$ 与 $-0.504 < ξ_{\rm s}$。这些约束与广义相对论(GR)的预测值$ξ_{\rm t}=15/1144$、$ξ_{\rm s}=0$一致,且相较于仅使用各向同性3PCF的联合分析,约束精度分别提升了35倍和20倍。我们通过研究多项内容验证结果的有效性,包括3PCF的理论模型、窗函数修正、累积信噪比(S/N)、费希尔矩阵,以及模拟数据的统计散射效应。我们还发现BOSS数据与Patchy模拟在3PCF测量结果上存在具有统计显著性的差异。最后,我们将所有3PCF分析代码打包为\textsc{HITOMI}并公开发布,便于读者复现本文全部结果,并将其便捷应用于未来正在开展的星系巡天项目。

英文摘要:

We report a new test of modified gravity theories using the large-scale structure of the Universe. This paper is the first attempt to (1) apply a joint analysis of the anisotropic components of galaxy two- and three-point correlation functions (2 and 3PCFs) to actual galaxy data and (2) constrain the nonlinear effects of degenerate higher-order scalar-tensor (DHOST) theories on cosmological scales. Applying this analysis to the Baryon Oscillation Spectroscopic Survey (BOSS) data release 12, we obtain the lower bounds of $-1.655 < ξ_{\rm t}$ and $-0.504 < ξ_{\rm s}$ at the $95\%$ confidence level on the parameters characterising the time evolution of the tidal and shift terms of the second-order velocity field. These constraints are consistent with GR predictions of $ξ_{\rm t}=15/1144$ and $ξ_{\rm s}=0$. Moreover, they represent a $35$-fold and $20$-fold improvement, respectively, over the joint analysis with only the isotropic 3PCF. We ensure the validity of our results by investigating various quantities, including theoretical models of the 3PCF, window function corrections, cumulative ${\rm S/N}$, Fisher matrices, and statistical scattering effects of mock simulation data. We also find statistically significant discrepancies between the BOSS data and the Patchy mocks for the 3PCF measurement. Finally, we package all of our 3PCF analysis codes under the name \textsc{HITOMI} and make them publicly available so that readers can reproduce all the results of this paper and easily apply them to ongoing future galaxy surveys.

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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