Deviation from the cosmological constant or systematic errors?
文献类型：期刊论文
| 作者 | Qi, Shi1,2,3 ; Lu, Tan1,2; Wang, Fa-Yin4
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2009-09-01 |
| 卷号 | 398期号:1页码:L78-L82 |
| 关键词 | supernovae: general cosmological parameters gamma-rays: bursts |
| 英文摘要 | In the work of Qi, Wang & Lu, gamma-ray bursts (GRBs) are used together with an earlier Type Ia supernova (SN Ia) data set to constrain the dark energy equation of state (EOS) in a nearly model-independent way. The improvements made by including GRBs show a slight shift of the dark energy EOS toward w > -1 at redshifts z greater than or similar to 0.5. It is interesting that, when we have more SNe Ia, SNe Ia themselves also show the same trend. Motivated by the fact that both SNe Ia and GRBs seem to prefer a dark energy EOS greater than -1 at redshifts z greater than or similar to 0.5, we perform a careful investigation of this situation, including more careful treatments of measurement errors of GRBs and cross-checking the results by using different ways of including GRBs. We find that the deviation of dark energy from the cosmological constant at redshifts z greater than or similar to 0.5 is large enough that we should pay close attention to it with future observational data. Such a deviation may arise from some biasing systematic errors in the handling of SNe Ia and/or GRBs, or more interestingly from the nature of the dark energy itself. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | GAMMA-RAY BURSTS ; DIGITAL SKY SURVEY ; DARK ENERGY ; IA SUPERNOVAE ; HUBBLE DIAGRAM ; LIGHT CURVES ; CONSTRAINTS ; GALAXIES ; CFA |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000269136800017 |
| 公开日期 | 2015-04-14 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/11046]  |
| 专题 | 紫金山天文台_院士文集_陆埮 |
| 作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Peoples R China 3.CAS, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China 4.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qi, Shi,Lu, Tan,Wang, Fa-Yin. Deviation from the cosmological constant or systematic errors?[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2009,398(1):L78-L82. |
| APA | Qi, Shi,Lu, Tan,&Wang, Fa-Yin.(2009).Deviation from the cosmological constant or systematic errors?.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,398(1),L78-L82. |
| MLA | Qi, Shi,et al."Deviation from the cosmological constant or systematic errors?".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 398.1(2009):L78-L82. |
入库方式： OAI收割
来源：紫金山天文台
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