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题名: On the effect of the degeneracy among dark energy parameters
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
学科分类: Physics
DOI: 10.1140/epjc/s10052-014-2729-2
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.
部门归属: [Gong, Yungui; Gao, Qing] Huazhong Univ Sci & Technol, Sch Phys, MOE Key Lab Fundamental Quant Measurement, Wuhan 430074, Hubei, Peoples R China; [Gong, Yungui] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, 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.
资助者: 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
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000330989200001
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15493
Appears in Collections:理论物理所2014年知识产出 _期刊论文

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Gong, YG,Gao, Q. On the effect of the degeneracy among dark energy parameters[J]. EUROPEAN PHYSICAL JOURNAL C,2014,74(1):2729.
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