Integrated approach to cosmology: Combining CMB, large-scale structure, and weak lensing

被引：28

作者：

Nicola, Andrina ^{[1
]}

Refregier, Alexandre ^{[1
]}

Amara, Adam ^{[1
]}

机构：

[1] ETH, Dept Phys, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW D | 2016年 / 94卷 / 08期

基金：

美国国家航空航天局; 瑞士国家科学基金会; 美国安德鲁·梅隆基金会; 美国国家科学基金会;

关键词：

DIGITAL SKY SURVEY; OSCILLATION SPECTROSCOPIC SURVEY; DATA RELEASE; ANGULAR MASKS; CO-ADD; GALAXIES; MODEL; CONSTRAINTS; MAPS;

D O I：

10.1103/PhysRevD.94.083517

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recent observational progress has led to the establishment of the standard Lambda 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 Lambda 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.

引用

页数：27

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