Investigating the possibility of a turning point in the dark energy equation of state

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	Investigating the possibility of a turning point in the dark energy equation of state
	Li, M
刊名	SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
	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
ISSN号	1674-7348
通讯作者	Li, X (reprint author), Korea Inst Adv Study, Hoegiro 87, 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.
学科主题	Physics
收录类别	SCI
资助信息	National Natural Science Foundation of China [11275247, 11335012]; KDES program
原文出处	http://dx.doi.org/10.1007/s11433-014-5497-y
语种	英语
WOS记录号	WOS:000339365800025
公开日期	2015-06-03
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/15696]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	Li, M. 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.
APA	Li, M.(2014).Investigating the possibility of a turning point in the dark energy equation of state.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,57(8),1607-1612.
MLA	Li, M."Investigating the possibility of a turning point in the dark energy equation of state".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 57.8(2014):1607-1612.