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题名: COSMOLOGICAL CONSTRAINT AND ANALYSIS ON HOLOGRAPHIC DARK ENERGY MODEL CHARACTERIZED BY THE CONFORMAL-AGE-LIKE LENGTH
作者: Huang, ZP ;  Wu, YL
刊名: INTERNATIONAL JOURNAL OF MODERN PHYSICS A
出版日期: 2012
卷号: 27, 期号:22, 页码:1250130
关键词: KAROLYHAZY UNCERTAINTY RELATION ;  PROBE WMAP OBSERVATIONS ;  EQUATION-OF-STATE ;  SPACE-TIME ;  INFRARED CUTOFF ;  CONSTANT ;  UNIVERSE ;  SUPERNOVAE ;  TRANSITION ;  INFLATION
学科分类: Physics
部门归属: [Huang, Zhuo-Peng; Wu, Yue-Liang] Chinese Acad Sci, Inst Theoret Phys, SKLTP, KITPC, Beijing 100190, Peoples R China
英文摘要: We present a best-fit analysis on the single-parameter holographic dark energy model characterized by the conformal-age-like length, L = 1/a(4)(t) integral(t)(0) dt' a(3)(t'). Based on the Union2 compilation of 557 supernova Ia (SNIa) data, the baryon acoustic oscillation (BAO) results from the Sloan Digital Sky Survey data release 7 (SDSS DR7) and the cosmic microwave background radiation (CMB) data from the 7-year Wilkinson Microwave Anisotropy Probe (WMAP7), we show that the model gives the minimal chi(2)(min) = 546.273, which is comparable to chi(2)(Lambda CDM) = 544.616 for the Lambda CDM model. The single parameter d concerned in the model is found to be d = 0.232 +/- 0.006 +/- 0.009. Since the fractional density of dark energy Omega(de) similar to d(2)a(2) at a << 1, the fraction of dark energy is naturally negligible in the early universe, Omega(de) << 1 at a << 1. The resulting constraints on the present fractional energy density of matter and the equation of state are Omega(m0) = 0.286(-0.018-0.028)(+0.019+0.032) and w(de0) = -1.240(-0.027-0.044)(+0.027+0.045) respectively. We also provide a systematic analysis on the cosmic evolutions of the fractional energy density of dark energy, the equation of state of dark energy, the deceleration parameter and the statefinder. It is noticed that the equation of state crosses from w(de) > -1 to w(de) < -1, the universe transits from decelerated expansion (q > 0) to accelerated expansion (q < 0) recently, and the statefinder may serve as a sensitive diagnostic to distinguish the CHDE model 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:000308228700013
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15031
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. COSMOLOGICAL CONSTRAINT AND ANALYSIS ON HOLOGRAPHIC DARK ENERGY MODEL CHARACTERIZED BY THE CONFORMAL-AGE-LIKE LENGTH[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS A,2012,27(22):1250130.
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