On the effect of the degeneracy among dark energy parameters
文献类型：期刊论文
| 作者 | Gong, YG ; Gao, Q |
| 刊名 | EUROPEAN PHYSICAL JOURNAL C
 |
| 出版日期 | 2014 |
| 卷号 | 74期号:1页码:2729 |
| 关键词 | BARYON ACOUSTIC-OSCILLATIONS EQUATION-OF-STATE COSMOLOGICAL CONSTANT COSMIC ACCELERATION SUPERNOVA DATA IA SUPERNOVAE CONSTRAINTS QUINTESSENCE UNIVERSE MODEL |
| ISSN号 | 1434-6044 |
| 通讯作者 | Gong, YG (reprint author), Huazhong Univ Sci & Technol, Sch Phys, MOE Key Lab Fundamental Quant Measurement, Wuhan 430074, Hubei, Peoples R China. |
| 英文摘要 | The dynamics of scalar fields as dark energy is well approximated by some general relations between the equation of state parameter w(z) and the fractional energy density Of. Based on the approximation, for slowly rolling scalar fields, we derived the analytical expressions of w(z) which reduce to the popular Chevallier-Polarski-Linder parametrization with an explicit degeneracy relation between w(0) and w(a). The models approximate the dynamics of scalar fields well and help eliminate the degeneracies among w(a), w(0), and Omega(m0). With the explicit degeneracy relations, we test their effects on the constraints of the cosmological parameters. We find that: (1) The analytical relations between w(0) and w(a) for the two models are consistent with observational data. (2) The degeneracies have little effect on Omega(m0). (3) The 1 sigma error of w(0) was reduced about 30 % with the degeneracy relations. |
| 学科主题 | Physics |
| 收录类别 | SCI |
| 资助信息 | National Basic Science Program (Project 973) of China [2010CB833004]; NNSF of China [10935013, 11175270]; Program for New Century Excellent Talents in University; Fundamental Research Funds for the Central Universities |
| 原文出处 | http://dx.doi.org/10.1140/epjc/s10052-014-2729-2 |
| 语种 | 英语 |
| WOS记录号 | WOS:000330989200001 |
| 公开日期 | 2014-04-25 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/15493]  |
| 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 | Gong, YG,Gao, Q. On the effect of the degeneracy among dark energy parameters[J]. EUROPEAN PHYSICAL JOURNAL C,2014,74(1):2729. |
| APA | Gong, YG,&Gao, Q.(2014).On the effect of the degeneracy among dark energy parameters.EUROPEAN PHYSICAL JOURNAL C,74(1),2729. |
| MLA | Gong, YG,et al."On the effect of the degeneracy among dark energy parameters".EUROPEAN PHYSICAL JOURNAL C 74.1(2014):2729. |
入库方式： OAI收割
来源：理论物理研究所
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