PMO OpenIR
An Improved Method to Measure the Cosmic Curvature
Wei, Jun-Jie1,2; Wu, Xue-Feng1,3,4
2017-04-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume838Issue:2Pages:9
Corresponding AuthorWei, Jun-Jie(jjwei@pmo.ac.cn)
AbstractIn this paper, we propose an improved model-independent method to constrain the cosmic curvature by combining the most recent Hubble parameter H(z) and supernovae Ia (SNe Ia) data. Based on the H(z) data, we first use the model-independent smoothing technique, Gaussian processes, to construct a distance modulus mu(H)(z) which is susceptible to the cosmic curvature parameter Omega(k). In contrary to previous studies, the light-curve-fitting parameters, which account for the distance estimation of SN (mu(SN)( z)), are set free to investigate whether Omega(k) has a dependence on them. By comparing mu(H)(z) to mu(SN)(z), we put limits on Omega(k). Our results confirm that Omega(k) is independent of the SN light-curve parameters. Moreover, we show that the measured Omega(k) is in good agreement with zero cosmic curvature, implying that there is no significant deviation from a flat universe at the current observational data level. We also test the influence of different H(z) samples and different Hubble constant H-0 values, finding that different H( z) samples do not have a significant impact on the constraints. However, different H-0 priors can affect the constraints of Ok to some degree. The prior of H-0 = 73.24 +/- 1.74 km s(-1) Mpc(-1) gives a value of Omega(k), a little bit above the 1 sigma confidence level away from 0, but H-0 = 69.6 +/-. 0.7 km s(-1) Mpc(-1) gives it below 1 sigma.
Keywordcosmological parameters cosmology: observations galaxies: general supernovae: general
DOI10.3847/1538-4357/aa674b
WOS KeywordBARYON ACOUSTIC-OSCILLATIONS ; LUMINOUS RED GALAXIES ; HUBBLE CONSTANT ; COSMOLOGICAL PARAMETERS ; DARK ENERGY ; D-A ; CONSTRAINTS ; MODEL ; H(Z) ; CHRONOMETERS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000399137400009
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23115
Collection中国科学院紫金山天文台
Corresponding AuthorWei, Jun-Jie
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Guangxi Key Lab Relativist Astrophys, Nanning 530004, Peoples R China
3.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
4.Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Wei, Jun-Jie,Wu, Xue-Feng. An Improved Method to Measure the Cosmic Curvature[J]. ASTROPHYSICAL JOURNAL,2017,838(2):9.
APA Wei, Jun-Jie,&Wu, Xue-Feng.(2017).An Improved Method to Measure the Cosmic Curvature.ASTROPHYSICAL JOURNAL,838(2),9.
MLA Wei, Jun-Jie,et al."An Improved Method to Measure the Cosmic Curvature".ASTROPHYSICAL JOURNAL 838.2(2017):9.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Wei, Jun-Jie]'s Articles
[Wu, Xue-Feng]'s Articles
Baidu academic
Similar articles in Baidu academic
[Wei, Jun-Jie]'s Articles
[Wu, Xue-Feng]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Wei, Jun-Jie]'s Articles
[Wu, Xue-Feng]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.