Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological implications from two decades of spectroscopic surveys at the Apache Point Observatory
Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological implications from two decades of spectroscopic surveys at the Apache Point Observatory
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2020-08
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通讯作者：
S. Alam;M. Aubert;S. Ávila;C. Balland;J. Bautista;M. Bershady;D. Bizyaev;M. Blanton;A. Bolton-A.
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作者：
S. Alam;M. Aubert;S. Ávila;C. Balland;J. Bautista;M. Bershady;D. Bizyaev;M. Blanton;A. Bolton-A.
我们提出了宇宙学的影响，从最终测量的集群使用星系，类星体，和Ly$\alpha$森林完成斯隆数字巡天（SDSS）谱系的实验在大尺度结构。这些实验，从SDSS，SDSS-II，BOSS，和eBOSS的数据组成，提供独立的测量重子声振荡（BAO）测量角直径距离和哈勃距离相对于声音地平线，$r_d$，从八个不同的样品和六个测量的增长率参数，$f\sigma_8$，从红移空间扭曲（RSD）。这个复合样品是同类样品中最具约束力的，使我们能够在经过二十年的专门光谱观测后对宇宙学模型进行全面评估。我们表明，BAO数据本身就能够排除暗能量免费模型在超过8个标准差的扩展到平坦的，$\Lambda$CDM模型，允许曲率。当与普朗克宇宙微波背景（CMB）的温度和偏振测量相结合时，BAO数据提供了曲率约束的近一个数量级的改进。RSD测量表明的增长率是一致的预测从普朗克原始数据和广义相对论。当结合SDSS BAO和RSD与外部数据的结果，所有多参数扩展保持一致的$\Lambda$CDM模型。无论宇宙学模型如何，$\Omega_\Lambda$、$H_0$和$\sigma_8 $的精度保持在大约1%，显示模型之间的中心值变化小于0.6%。在o $w_0w_a$CDM下的反距离阶梯测量产生$H_0= 68.20 \pm 0.81 \，\rm km\，s^{-1} Mpc^{-1}$，用几种直接测定方法保持张力。（节略）
We present the cosmological implications from final measurements of clustering using galaxies, quasars, and Ly$\alpha$ forests from the completed Sloan Digital Sky Survey (SDSS) lineage of experiments in large-scale structure. These experiments, composed of data from SDSS, SDSS-II, BOSS, and eBOSS, offer independent measurements of baryon acoustic oscillation (BAO) measurements of angular-diameter distances and Hubble distances relative to the sound horizon, $r_d$, from eight different samples and six measurements of the growth rate parameter, $f\sigma_8$, from redshift-space distortions (RSD). This composite sample is the most constraining of its kind and allows us to perform a comprehensive assessment of the cosmological model after two decades of dedicated spectroscopic observation. We show that the BAO data alone are able to rule out dark-energy-free models at more than eight standard deviations in an extension to the flat, $\Lambda$CDM model that allows for curvature. When combined with Planck Cosmic Microwave Background (CMB) measurements of temperature and polarization the BAO data provide nearly an order of magnitude improvement on curvature constraints. The RSD measurements indicate a growth rate that is consistent with predictions from Planck primary data and with General Relativity. When combining the results of SDSS BAO and RSD with external data, all multiple-parameter extensions remain consistent with a $\Lambda$CDM model. Regardless of cosmological model, the precision on $\Omega_\Lambda$, $H_0$, and $\sigma_8$, remains at roughly 1\%, showing changes of less than 0.6\% in the central values between models. The inverse distance ladder measurement under a o$w_0w_a$CDM yields $H_0= 68.20 \pm 0.81 \, \rm km\, s^{-1} Mpc^{-1}$, remaining in tension with several direct determination methods. (abridged)