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Model-independent Constraints on Cosmic Curvature and Opacity
Wang, Guo-Jian1; Wei, Jun-Jie2,3; Li, Zheng-Xiang1; Xia, Jun-Qing1; Zhu, Zong-Hong1,4
2017-09-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume847Issue:1Pages:7
Abstract

In this paper, we propose to estimate the spatial curvature of the universe and the cosmic opacity in a model-independent way with expansion rate measurements, H(z), and type Ia supernova (SNe Ia). On the one hand, using a nonparametric smoothing method Gaussian process, we reconstruct a function H(z) from opacity-free expansion rate measurements. Then, we integrate the H(z) to obtain distance modulus mu(H), which is dependent on the cosmic curvature. On the other hand, distances of SNe Ia can be determined by their photometric observations and thus are opacity-dependent. In our analysis, by confronting distance moduli mu(H) with those obtained from SNe Ia, we achieve estimations for both the spatial curvature and the cosmic opacity without any assumptions for the cosmological model. Here, it should be noted that light curve fitting parameters, accounting for the distance estimation of SNe Ia, are determined in a global fit together with the cosmic opacity and spatial curvature to get rid of the dependence of these parameters on cosmology. In addition, we also investigate whether the inclusion of different priors for the present expansion rate (H-0: global estimation, 67.74 +/- 0.46 km s(-1) Mpc(-1), and local measurement, 73.24 +/- 1.74 km s(-1) Mpc(-1)) exert influence on the reconstructed H(z) and the following estimations of the spatial curvature and cosmic opacity. Results show that, in general, a spatially flat and transparent universe is preferred by the observations. Moreover, it is suggested that priors for H-0 matter a lot. Finally, we find that there is a strong degeneracy between the curvature and the opacity.

Keywordcosmological parameters cosmology: observations supernovae: general
DOI10.3847/1538-4357/aa8725
WOS KeywordDISTANCE-DUALITY RELATION ; LUMINOUS RED GALAXIES ; GENERAL-RELATIVITY ; IA SUPERNOVAE ; DARK ENERGY ; HUBBLE PARAMETER ; UNIVERSE ; EXPANSION ; CHRONOMETERS ; DEFINITION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000411341100021
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22731
Collection中国科学院紫金山天文台
Corresponding AuthorWang, Guo-Jian
Affiliation1.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Guangxi Key Lab Relativist Astrophys, Nanning 530004, Peoples R China
4.Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Wang, Guo-Jian,Wei, Jun-Jie,Li, Zheng-Xiang,et al. Model-independent Constraints on Cosmic Curvature and Opacity[J]. ASTROPHYSICAL JOURNAL,2017,847(1):7.
APA Wang, Guo-Jian,Wei, Jun-Jie,Li, Zheng-Xiang,Xia, Jun-Qing,&Zhu, Zong-Hong.(2017).Model-independent Constraints on Cosmic Curvature and Opacity.ASTROPHYSICAL JOURNAL,847(1),7.
MLA Wang, Guo-Jian,et al."Model-independent Constraints on Cosmic Curvature and Opacity".ASTROPHYSICAL JOURNAL 847.1(2017):7.
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