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题名: The general property of dynamical quintessence field
作者: Gong, YG
刊名: PHYSICS LETTERS B
出版日期: 2014
卷号: 731, 期号:-, 页码:342-349
关键词: COSMOLOGICAL SCALING SOLUTIONS ;  PSEUDO-GOLDSTONE BOSONS ;  DARK ENERGY ;  SCALAR FIELD ;  MODIFIED GRAVITY ;  MODELS ;  POTENTIALS ;  CONSTANT ;  UNIVERSE ;  LAMBDA
学科分类: Physics
DOI: 10.1016/j.physletb.2014.03.013
通讯作者: Gong, YG (reprint author), Huazhong Univ Sci & Technol, Sch Phys, MOE Key Lab Fundamental Quant Measurement, Wuhan 430074, Peoples R China.
部门归属: [Gong, Yungui] Huazhong Univ Sci & Technol, Sch Phys, MOE Key Lab Fundamental Quant Measurement, Wuhan 430074, Peoples R China
英文摘要: We discuss the general dynamical behaviors of quintessence field, in particular, the general conditions for tracking and thawing solutions are discussed. We explain what the tracking solutions mean and in what sense the results depend on the initial conditions. Based on the definition of tracking solution, we give a simple explanation on the existence of a general relation between w(phi) and Omega(phi) which is independent of the initial conditions for the tracking solution. A more general tracker theorem which requires large initial values of the roll parameter is then proposed. To get thawing solutions, the initial value of the roll parameter needs to be small. The power-law and pseudo-Nambu Goldstone boson potentials are used to discuss the tracking and thawing solutions. A more general w(phi)-Omega(phi) relation is derived for the thawing solutions. Based on the asymptotical behavior of the w(phi)-Omega(phi) relation, the flow parameter is used to give an upper limit on w'(phi) for the thawing solutions. If we use the observational constraint w(phi 0) < -0.8 and 0.2 < Omega(m0) < 0.4, then we require n less than or similar to 1 for the inverse power-law potential V(phi) = V-0(phi/m(pl)) (n) with tracking solutions and the initial value of the roll parameter vertical bar lambda(l)vertical bar < 1.3 for the potentials with the thawing solutions. (C) 2014 The Author. Published by Elsevier BAT. This is an open access article under the CC BY license (http:creativecommons.org/licenses/by/3.0/).
资助者: National Basic Science Program (Project 973) of China [2010CB833004]; NNSF of China [10935013, 11175270]; Program for New Century Excellent Talents in University [NCET-12-0205]; Fundamental Research Funds for the Central Universities [2013YQ055]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000334094500055
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15792
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Recommended Citation:
Gong, YG. The general property of dynamical quintessence field[J]. PHYSICS LETTERS B,2014,731(-):342-349.
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