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题名: Approximate omega(phi) similar to Omega(phi) Relations in Quintessence Models
作者: Luo Ming-Xing ;  Su Qi-Ping
刊名: COMMUNICATIONS IN THEORETICAL PHYSICS
出版日期: 2010
卷号: 54, 期号:1, 页码:186-190
关键词: HUBBLE-SPACE-TELESCOPE ;  DARK ENERGY ;  COSMOLOGICAL CONSTANT ;  CONSTRAINTS ;  DISCOVERIES ;  SUPERNOVAE ;  EVOLUTION ;  REDSHIFT ;  UNIVERSE
学科分类: Physics
通讯作者: Luo, MX , Zhejiang Univ, Dept Phys, Zhejiang Inst Modern Phys, Hangzhou 310027, Peoples R China
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
英文摘要: 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.
资助者: National Science Foundation of China[10425525]
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000280141900034
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5078
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Luo Ming-Xing,Su Qi-Ping. Approximate omega(phi) similar to Omega(phi) Relations in Quintessence Models[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2010,54(1):186-190.
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