Measurement of the matter-radiation equality scale using the extended baryon oscillation spectroscopic survey quasar sample
Measurement of the matter-radiation equality scale using the extended baryon oscillation spectroscopic survey quasar sample
复制标题
使用扩展重子振荡光谱测量类星体样本测量物质-辐射相等尺度
DOI：
10.1093/mnras/stad1867
复制
发表时间：
2023
影响因子：
4.8
通讯作者：
Bahr-Kalus B
中科院分区：
文献类型：
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作者：
Bahr-Kalus B
物质功率谱峰的位置，即所谓的周转尺度，是由物质-辐射相等时期的视界大小决定的。根据相对论时代的宇宙物理学，它可以很容易地预测，因此可以作为标准标尺，独立于物质功率谱中存在的其他特征，如重子声学振荡（BAOs）。我们利用扩展重子振荡光谱调查（eBOSS）测量的类星体分布，以一种与模型无关的统计方式确定了周转尺度。我们通过使用模态去投影技术降低协方差矩阵中受影响尺度的权重来避免对BAO进行建模。我们测量峰的波数为，对应于膨胀尺度为。在确定膨胀历史方面，这与当前的BAO距离测量没有竞争关系，但确实提供了有用的交叉检查。我们将这一测量结果与来自Pantheon的ia型超新星数据和eBOSS的BAO数据的低红移距离测量结果结合起来，对哈勃- lema<e:1>参数进行了无声视界估计，发现它与Pantheon和eBOSS BAO一致。我们对暗能量光谱仪器（DESI）调查、莫纳克亚光谱探测器（MSE）和MegaMapper的周转率测量进行了预测，这将使距离测定更加精确和准确。
The position of the peak of the matter power spectrum, the so-called turnover scale, is set by the horizon size at the epoch of matter-radiation equality. It can easily be predicted in terms of the physics of the universe in the relativistic era, and so can be used as a standard ruler, independent of other features present in the matter power spectrum, such as baryon acoustic oscillations (BAOs). We use the distribution of quasars measured by the extended Baryon Oscillation Spectroscopic Survey (eBOSS) to determine the turnover scale in a model-independent fashion statistically. We avoid modelling the BAO by down-weighting affected scales in the covariance matrix using the mode deprojection technique. We measure the wavenumber of the peak to be, corresponding to a dilation scale of. This is not competitive with current BAO distance measures in terms of determining the expansion history but does provide a useful cross-check. We combine this measurement with low-redshift distance measurements from type-Ia supernova data from Pantheon and BAO data from eBOSS to make a sound-horizon free estimate of the Hubble–Lemaître parameter and find it to bewith Pantheon, andwith eBOSS BAO. We make predictions for the measurement of the turnover scale by the Dark Energy Spectroscopic Instrument (DESI) survey, the Maunakea Spectroscopic Explorer (MSE), and MegaMapper, which will make more precise and accurate distance determinations.
Samreay/ChainConsumer v0.33.0
DOI：
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发表时间：
2020
期刊：
影响因子：
--
作者：
Samuel Hinton;C. Adams;Codacy Badger
通讯作者：
Codacy Badger