ITP OpenIR  > SCI期刊论文
Yang, XF; Wang, FY; Chu, Z; Wang, FY (reprint author), Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China.
Searching for a preferred direction with Union2.1 data
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Language英语
KeywordGamma-ray Bursts Dark-energy Supernova Data Constraints Dependence Anisotropy Universe
AbstractA cosmological preferred direction was reported from the Type Ia supernovae data in recent years. We use the Union2.1 data to give a simple classification of such studies for the first time. Because the maximum anisotropic direction is independent of isotropic dark energy models, we adopt two cosmological models (Lambda CDM, wCDM) for the hemisphere comparison analysis and the Lambda cold dark matter (Lambda CDM) model for a dipole-fitting approach. In hemisphere comparison method, the matter density and the equation of state of dark energy are adopted as the diagnostic qualities in the Lambda CDM model and the wCDM model, respectively. In the dipole-fitting approach, we fit the fluctuation of distance modulus. We find that there is a null signal for the hemisphere comparison method, while a preferred direction (b = -14 degrees.3 +/- 10 degrees.1, l = 307.1 degrees +/- 16.2 degrees) for the dipole-fitting method. This result indicates that the dipole fit is more sensitive than the hemisphere comparison method.
2014
ISSN0035-8711
Volume437Issue:2Pages:1840-1846
Subject AreaPhysics
DOI10.1093/mnras/stt2015
Indexed BySCI
Funding OrganizationState Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences; National Basic Research Program of China (973 Program) [2014CB845800]; National Natural Science Foundation of China [11373022, 11103007, 11033002] ; State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences; National Basic Research Program of China (973 Program) [2014CB845800]; National Natural Science Foundation of China [11373022, 11103007, 11033002] ; State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences; National Basic Research Program of China (973 Program) [2014CB845800]; National Natural Science Foundation of China [11373022, 11103007, 11033002] ; State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences; National Basic Research Program of China (973 Program) [2014CB845800]; National Natural Science Foundation of China [11373022, 11103007, 11033002]
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Cited Times:34[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/15517
CollectionSCI期刊论文
Corresponding AuthorWang, FY (reprint author), Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China.
Recommended Citation
GB/T 7714
Yang, XF,Wang, FY,Chu, Z,et al. Searching for a preferred direction with Union2.1 data[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,437(2):1840-1846.
APA Yang, XF,Wang, FY,Chu, Z,&Wang, FY .(2014).Searching for a preferred direction with Union2.1 data.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,437(2),1840-1846.
MLA Yang, XF,et al."Searching for a preferred direction with Union2.1 data".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 437.2(2014):1840-1846.
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