arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1607.03147astro-ph.CO
收藏

SDSS-III重子振荡光谱巡天中星系的成团:组态空间成团楔的宇宙学意义

The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological implications of the configuration-space clustering wedges

Ariel G. Sanchez, Roman Scoccimarro, Martin Crocce, Jan Niklas Grieb, Salvador Salazar-Albornoz, Claudio DallaVecchia, Martha Lippich, Florian Beutler, Joel R. … 展开作者

Ariel G. Sanchez, Roman Scoccimarro, Martin Crocce, Jan Niklas Grieb, Salvador Salazar-Albornoz, Claudio DallaVecchia, Martha Lippich, Florian Beutler, Joel R. Brownstein, Chia-Hsun Chuang, Daniel J. Eisenstein, Francisco-Shu Kitaura, Matthew D. Olmstead, Will J. Percival, Francisco Prada, Sergio Rodriguez-Torres, Ashley J. Ross, Lado Samushia, Hee-Jong Seo, Jeremy Tinker, Rita Tojeiro, Mariana Vargas-Magana, Yuting Wang, Gong-Bo Zhao

摘要:

我们探索的宇宙学意义的各向异性聚类测量配置空间的最终星系样本的SDSS-III重子振荡光谱巡天的数据发布12。我们实现了一个新的详细的非线性,星系的偏见和红移空间扭曲的影响,可用于提取公正的宇宙学信息,从我们的测量尺度$s \gtrsim 20\,h^{-1}{\rm Mpc}$的建模。我们将BOSS的星系聚类信息与最新的宇宙微波背景(CMB)观测和Ia型超新星样本相结合,没有发现$Λ$ CDM宇宙学模型偏离的显著证据。特别是,这些数据集可以约束暗能量状态方程参数为$w_{\rm DE}=-0.996\pm0.042$时,假设时间无关,宇宙的曲率为$Ω_{k}=-0.0007\pm 0.0030$和中微子质量的总和为$\sum m_ν < 0.25\,{\rm eV}$在95% CL。我们探讨了$f(z)=Ω_{\rm m}(z)^γ$假设下宇宙结构增长率的约束条件,得到了$γ= 0.609\pm 0.079$,与广义相对论的$γ=0.55$预言符合得很好.我们压缩的信息,我们的聚类测量到约束的参数组合$D_{\rm V}(z)/r_{\rm d}$,$F_{\rm AP}(z)$和$fσ_8(z)$的有效红移的$z=0.38$,$0.51$和$0.61$与各自的协方差矩阵,并找到很好的协议与这些参数的预测从最佳拟合$Λ$ CDM模型从普朗克卫星的CMB数据。本文是分析BOSS最终星系聚类数据集的一部分。这里提出的测量和可能性与Alam et al.(2016)中的其他测量和可能性相结合,以产生BOSS的最终宇宙学约束。

英文摘要:

We explore the cosmological implications of anisotropic clustering measurements in configuration space of the final galaxy samples from Data Release 12 of the SDSS-III Baryon Oscillation Spectroscopic Survey. We implement a new detailed modelling of the effects of non-linearities, galaxy bias and redshift-space distortions that can be used to extract unbiased cosmological information from our measurements for scales $s \gtrsim 20\,h^{-1}{\rm Mpc}$. We combined the galaxy clustering information from BOSS with the latest cosmic microwave background (CMB) observations and Type Ia supernovae samples and found no significant evidence for a deviation from the $Λ$CDM cosmological model. In particular, these data sets can constrain the dark energy equation of state parameter to $w_{\rm DE}=-0.996\pm0.042$ when assumed time-independent, the curvature of the Universe to $Ω_{k}=-0.0007\pm 0.0030$ and the sum of the neutrino masses to $\sum m_ν < 0.25\,{\rm eV}$ at 95 per cent CL. We explore the constraints on the growth rate of cosmic structures assuming $f(z)=Ω_{\rm m}(z)^γ$ and obtain $γ= 0.609\pm 0.079$, in good agreement with the predictions of general relativity of $γ=0.55$. We compress the information of our clustering measurements into constraints on the parameter combinations $D_{\rm V}(z)/r_{\rm d}$, $F_{\rm AP}(z)$ and $fσ_8(z)$ at the effective redshifts of $z=0.38$, $0.51$ and $0.61$ with their respective covariance matrices and find good agreement with the predictions for these parameters obtained from the best-fitting $Λ$CDM model to the CMB data from the Planck satellite. This paper is part of a set that analyses the final galaxy clustering dataset from BOSS. The measurements and likelihoods presented here are combined with others in Alam et al. (2016) to produce the final cosmological constraints from BOSS.

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。

↑