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Gong, YG; Gao, Q; Gong, YG (reprint author), Huazhong Univ Sci & Technol, Sch Phys, MOE Key Lab Fundamental Quant Measurement, Wuhan 430074, Hubei, Peoples R China.
On the effect of the degeneracy among dark energy parameters
Source PublicationEUROPEAN PHYSICAL JOURNAL C
Language英语
KeywordBaryon Acoustic-oscillations Equation-of-state Cosmological Constant Cosmic Acceleration Supernova Data Ia Supernovae Constraints Quintessence Universe Model
AbstractThe 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.
2014
ISSN1434-6044
Volume74Issue:1Pages:2729
Subject AreaPhysics
DOI10.1140/epjc/s10052-014-2729-2
Indexed BySCI
Funding OrganizationNational 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 ; 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 ; 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 ; 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
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/15493
Collection理论物理所科研产出_SCI论文
Corresponding AuthorGong, YG (reprint author), Huazhong Univ Sci & Technol, Sch Phys, MOE Key Lab Fundamental Quant Measurement, Wuhan 430074, Hubei, Peoples R China.
Recommended Citation
GB/T 7714
Gong, YG,Gao, Q,Gong, YG . On the effect of the degeneracy among dark energy parameters[J]. EUROPEAN PHYSICAL JOURNAL C,2014,74(1):2729.
APA Gong, YG,Gao, Q,&Gong, YG .(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.
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