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题名: Searching for a preferred direction with Union2.1 data
作者: Yang, XF ;  Wang, FY ;  Chu, Z
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2014
卷号: 437, 期号:2, 页码:1840-1846
关键词: GAMMA-RAY BURSTS ;  DARK-ENERGY ;  SUPERNOVA DATA ;  CONSTRAINTS ;  DEPENDENCE ;  ANISOTROPY ;  UNIVERSE
学科分类: Physics
DOI: 10.1093/mnras/stt2015
通讯作者: Wang, FY (reprint author), Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China.
部门归属: [Yang, Xiaofeng; Wang, F. Y.] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China; [Yang, Xiaofeng; Wang, F. Y.] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China; [Yang, Xiaofeng] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China; [Chu, Zhe] Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
英文摘要: A 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.
资助者: 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]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000331617000061
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15517
Appears in Collections:理论物理所2014年知识产出 _期刊论文

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Yang, XF,Wang, FY,Chu, Z. Searching for a preferred direction with Union2.1 data[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,437(2):1840-1846.
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