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Luo Ming-Xing; Su Qi-Ping; Luo, MX , Zhejiang Univ, Dept Phys, Zhejiang Inst Modern Phys, Hangzhou 310027, Peoples R China
Approximate omega(phi) similar to Omega(phi) Relations in Quintessence Models
Source PublicationCOMMUNICATIONS IN THEORETICAL PHYSICS
KeywordHubble-space-telescope Dark Energy Cosmological Constant Constraints Discoveries Supernovae Evolution Redshift Universe
AbstractQuintessence field is a widely-studied candidate of dark energy. There is "tracker solution" in quintessence models, in which evolution of the field phi at present times is not sensitive to its initial conditions. When the energy density of dark energy is neglectable (Omega(phi) << 1), evolution of the tracker solution can be well analysed from "tracker equation". In this paper, we try to study evolution of the quintessence field from "full tracker equation", which is valid for all spans of Omega(phi). We get stable fixed points of omega(phi) and Omega(phi) (noted as omega(phi) and Omega(phi)) from the "full tracker equation", i.e., omega(phi) and Omega(phi) will always approach (omega) over cap (phi) and (Omega) over cap (phi) respectively. Since (omega) over cap (phi) and (Omega) over cap (phi) are analytic functions of phi analytic relation of (omega) over cap (phi) similar to (Omega) over cap can be obtained, which is a good approximation for the omega(phi) similar to Omega(phi) relation and can be obtained for the most type of quintessence potentials. By using this approximation, we find that inequalities (omega) over tilde (phi) < omega(phi) and <(Omega)over cap>phi < Omega(phi) are statisfied if the omega(phi) (or <(omega)over cap>(phi))ecreases with time. In this way, the potential U(phi) can be constrained directly from observations, by no need of solving the equations of motion numerically.
2010
ISSN0253-6102
Volume54Issue:1Pages:186-190
Subject AreaPhysics
Indexed BySCI
Funding OrganizationNational Science Foundation of China[10425525] ; National Science Foundation of China[10425525] ; National Science Foundation of China[10425525] ; National Science Foundation of China[10425525]
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/5078
Collection理论物理所科研产出_SCI论文
Corresponding AuthorLuo, MX , Zhejiang Univ, Dept Phys, Zhejiang Inst Modern Phys, Hangzhou 310027, Peoples R China
Recommended Citation
GB/T 7714
Luo Ming-Xing,Su Qi-Ping,Luo, MX , Zhejiang Univ, Dept Phys, Zhejiang Inst Modern Phys, Hangzhou 310027, Peoples R China. Approximate omega(phi) similar to Omega(phi) Relations in Quintessence Models[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2010,54(1):186-190.
APA Luo Ming-Xing,Su Qi-Ping,&Luo, MX , Zhejiang Univ, Dept Phys, Zhejiang Inst Modern Phys, Hangzhou 310027, Peoples R China.(2010).Approximate omega(phi) similar to Omega(phi) Relations in Quintessence Models.COMMUNICATIONS IN THEORETICAL PHYSICS,54(1),186-190.
MLA Luo Ming-Xing,et al."Approximate omega(phi) similar to Omega(phi) Relations in Quintessence Models".COMMUNICATIONS IN THEORETICAL PHYSICS 54.1(2010):186-190.
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