Knowledge Management System of Institute of Theoretical Physics, CAS
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 Publication | COMMUNICATIONS IN THEORETICAL PHYSICS |
Keyword | Hubble-space-telescope Dark Energy Cosmological Constant Constraints Discoveries Supernovae Evolution Redshift Universe |
Abstract | 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. |
2010 | |
ISSN | 0253-6102 |
Volume | 54Issue:1Pages:186-190 |
Subject Area | Physics |
Indexed By | SCI |
Funding Organization | National 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 | |
Document Type | 期刊论文 |
Identifier | http://ir.itp.ac.cn/handle/311006/5078 |
Collection | 理论物理所科研产出_SCI论文 |
Corresponding Author | Luo, 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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