Integrated approach to cosmology: Combining CMB, large-scale structure and weak lensing
Integrated approach to cosmology: Combining CMB, large-scale structure and weak lensing
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宇宙学综合方法：结合 CMB、大尺度结构和弱透镜
DOI：
10.1103/physrevd.94.083517
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发表时间：
2016
影响因子：
5
通讯作者：
A. Amara
中科院分区：
文献类型：
--
作者：
A. Nicola;A. Réfrégier;A. Amara
最近的观测进展导致了标准的宇宙学模型的建立。这一进展是基于不同的宇宙学探测器，这些探测器通常在分析的最新阶段通过它们的可能性组合在一起。我们在这里实现了一个综合的宇宙学探测方案，从地图层面开始，这些探测器被组合在一个共同的框架中。这种处理是必要的，因为探针通常来自重叠的图谱，因此不是独立的。它还允许通过不同物理示踪剂的一致性来彻底测试宇宙学模型和系统学。作为第一个应用，我们结合了来自普朗克卫星的宇宙微波背景(CMB)的当前测量，以及来自SDSS的星系团和弱透镜。我们考虑了这些探测器的球谐功率谱，包括所有六个自相关和互相关，以及相关的全高斯协方差矩阵。这提供了对通常单独进行的不同分析的综合处理，包括CMB各向异性、宇宙切变、星系团、星系-星系透镜以及用星系和切变示踪剂综合的Sachs-Wolfe效应。我们导出了对$\mathm{\ensureath{\lambda}}\mathm{CDM}$参数的约束，这些约束与现有的约束兼容，并突出了数据集之间的紧张关系，这在这种综合处理中变得明显。我们讨论了这种方法如何为探测器组合提供一个完整和强大的综合框架，以及如何将其扩展到在当前和未来的大范围宇宙学调查的背景下包括其他示踪剂。
Recent observational progress has led to the establishment of the standard $\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$ model for cosmology. This development is based on different cosmological probes that are usually combined through their likelihoods at the latest stage in the analysis. We implement here an integrated scheme for cosmological probes, which are combined in a common framework starting at the map level. This treatment is necessary as the probes are generally derived from overlapping maps and are thus not independent. It also allows for a thorough test of the cosmological model and of systematics through the consistency of different physical tracers. As a first application, we combine current measurements of the cosmic microwave background (CMB) from the Planck satellite, and galaxy clustering and weak lensing from SDSS. We consider the spherical harmonic power spectra of these probes including all six auto- and cross-correlations along with the associated full Gaussian covariance matrix. This provides an integrated treatment of different analyses usually performed separately including CMB anisotropies, cosmic shear, galaxy clustering, galaxy-galaxy lensing and the integrated Sachs-Wolfe effect with galaxy and shear tracers. We derive constraints on $\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$ parameters that are compatible with existing constraints and highlight tensions between data sets, which become apparent in this integrated treatment. We discuss how this approach provides a complete and powerful integrated framework for probe combination and how it can be extended to include other tracers in the context of current and future wide-field cosmological surveys.