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Approximate omega(phi) similar to Omega(phi) Relations in Quintessence Models
Luo Ming-Xing; Su Qi-Ping; Luo, MX , Zhejiang Univ, Dept Phys, Zhejiang Inst Modern Phys, Hangzhou 310027, Peoples R China
2010
发表期刊COMMUNICATIONS IN THEORETICAL PHYSICS
ISSN0253-6102
卷号54期号:1页码:186-190
摘要Quintessence 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.
部门归属[Luo, MX; Su, QP] Zhejiang Univ, Dept Phys, Zhejiang Inst Modern Phys, Hangzhou 310027, Peoples R China; [Su, QP] Chinese Acad Sci, Key Lab Frontiers Theoret Phys, Inst Theoret Phys, Beijing 100190, Peoples R China
关键词Hubble-space-telescope Dark Energy Cosmological Constant Constraints Discoveries Supernovae Evolution Redshift Universe
学科领域Physics
资助者National Science Foundation of China[10425525] ; National Science Foundation of China[10425525] ; National Science Foundation of China[10425525] ; National Science Foundation of China[10425525]
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收录类别SCI
资助者National Science Foundation of China[10425525] ; National Science Foundation of China[10425525] ; National Science Foundation of China[10425525] ; National Science Foundation of China[10425525]
WOS记录号WOS:000280141900034
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被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/5078
专题理论物理所1978-2010年知识产出
通讯作者Luo, MX , Zhejiang Univ, Dept Phys, Zhejiang Inst Modern Phys, Hangzhou 310027, Peoples R China
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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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