Searching for a preferred direction with Union2.1 data
文献类型：期刊论文
| 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 |
| ISSN号 | 0035-8711 |
| 通讯作者 | Wang, FY (reprint author), Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, 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. |
| 学科主题 | Physics |
| 收录类别 | SCI |
| 资助信息 | 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] |
| 原文出处 | http://dx.doi.org/10.1093/mnras/stt2015 |
| 语种 | 英语 |
| WOS记录号 | WOS:000331617000061 |
| 公开日期 | 2014-04-25 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/15517]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 推荐引用方式 GB/T 7714 | 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. |
| APA | Yang, XF,Wang, FY,&Chu, Z.(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. |
入库方式： OAI收割
来源：理论物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。