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题名: Analysis on a general class of holographic type dark energy models
作者: Huang, ZP ;  Wu, YL
刊名: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
出版日期: 2012
期号: 7, 页码:35
关键词: COSMOLOGICAL CONSTANT ;  INFLATIONARY UNIVERSE ;  INFRARED CUTOFF ;  TRANSITION ;  SUPERNOVAE ;  FLATNESS ;  HORIZON ;  LAMBDA
学科分类: Physics
通讯作者: Huang, ZP (reprint author), Natl Univ Def Technol, Dept Phys, Changsha 410073, Hunan, Peoples R China.
部门归属: [Huang, Zhuo-Peng] Natl Univ Def Technol, Dept Phys, Changsha 410073, Hunan, Peoples R China; [Huang, Zhuo-Peng; Wu, Yue-Liang] Chinese Acad Sci, Inst Theoret Phys, KITPC, SKLTP, Beijing 100190, Peoples R China
英文摘要: We present a detail analysis on a general class of holographic type dark energy models characterized by the length scale L = 1/a(n)(t) integral(t)(0) dt' a(m) (t'). We show that n >= 0 is required by the recent cosmic accelerated expansion of universe. In the early universe dominated by the constituent with constant equation of state w(m), we have w(de) similar or equal to -1 - 2n/3 for n >= 0 and m < 0, and w(de) similar or equal to -2/3(n - m) + w(m) for n > m >= 0. The models with n > m >= 0 become single-parameter models like the Lambda CDM model due to the analytic feature Omega(de) similar or equal to d(2)/4(2m + 3w(m) + 3)(2)a(2(n-m)) at radiation-and matter-dominated epoch. Whereas the cases n = m >= 0 should be abandoned as the dark energy cannot dominate the universe forever and there might be too large fraction of dark energy in early universe, and the cases m > n >= 0 are forbidden by the self-consistent requirement Omega(de) << 1 in the early universe. Thus a detailed study on the single-parameter models corresponding to cases n > m >= 0 is carried out by using recent observations. The best-fit analysis indicates that the conformal-age-like models with n = m + 1, i.e. L proportional to 1/Ha in early universe, are more favored and also the models with smaller n for the given n - m are found to fit the observations better. The equation of state of the dark energy in models with n = m + 1 > 0 transits from w(de) < -1 during inflation to w(de) > -1 in radiation-and matter-dominated epoch, and then back to w(de) < -1 eventually. The best-fit result of the case (n = 0, m = -1) which is so-called eta HDE model proposed in [1] is the most favorable model and compatible with the Lambda CDM model.
资助者: National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10975184, 10947016]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000307079600020
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15062
Appears in Collections:理论物理所2012年知识产出_期刊论文

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Recommended Citation:
Huang, ZP,Wu, YL. Analysis on a general class of holographic type dark energy models[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2012(7):35.
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