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题名: Investigating the possibility of a turning point in the dark energy equation of state
作者: Hu, YZ ;  Li, M ;  Li, X ;  Zhang, ZH
刊名: SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
出版日期: 2014
卷号: 57, 期号:8, 页码:1607-1612
关键词: BARYON ACOUSTIC-OSCILLATIONS ;  COSMOLOGICAL CONSTANT ;  ACCELERATING UNIVERSE ;  HUBBLE CONSTANT ;  IA SUPERNOVAE ;  CONSTRAINTS ;  DISTANCE ;  LAMBDA ;  MATTER ;  PEAK
学科分类: Physics
DOI: 10.1007/s11433-014-5497-y
通讯作者: Li, X (reprint author), Korea Inst Adv Study, Hoegiro 87, Seoul 130722, South Korea.
部门归属: [Hu YaZhou ;  Li Miao ;  Zhang ZhenHui] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China ;  [Hu YaZhou ;  Zhang ZhenHui] Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China ;  [Li Miao] Sun Yat Sen Univ, Sch Astron & Space Sci, Guangzhou 510275, Guangdong, Peoples R China ;  [Li XiaoDong] Korea Inst Adv Study, Seoul 130722, South Korea
英文摘要: We investigate a second order parabolic parametrization, w(a) = W-t + w(a)(a(t) - a)(2), which is a direct characterization of a possible turning in w. The cosmological consequence of this parametrization is explored by using the observational data of the SNLS3 type Ia supernovae sample, the CMB measurements from WMAP9 and Planck, the Hubble parameter measurement from HST, and the baryon acoustic oscillation (BAO) measurements from 6dFGS, BOSS DR11 and improved WiggleZ. We found the existence of a turning point in w at a similar to 0.7 is favored at l sigma CL. In the epoch 0.55 < a < 0.9, w < -1 is favored at 1 sigma CL, and this significance increases near a = 0.8, reaching a 2 sigma CL. The parabolic parametrization achieve equivalent performance to the ACDM and Chevallier-Polarski-Linder (CPL) models when the Akailce information criterion was used to assess them. Our analysis shows the value of considering high order parametrizations when studying the cosmological constraints on w.
资助者: National Natural Science Foundation of China [11275247, 11335012]; KDES program
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000339365800025
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15696
Appears in Collections:理论物理所2014年知识产出 _期刊论文

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Recommended Citation:
Hu, YZ,Li, M,Li, X,et al. Investigating the possibility of a turning point in the dark energy equation of state[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2014,57(8):1607-1612.
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