Probing the dynamics of dark energy with divergence-free parametrizations: A global fit study

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	Probing the dynamics of dark energy with divergence-free parametrizations: A global fit study
	AMS Collaboration
刊名	PHYSICS LETTERS B
	2011
卷号	703 期号:2 页码:#REF!
关键词	Dark energy Divergence-free parametrizations Global fit Markov Chain Monte Carlo approach
通讯作者	Zhang, X (reprint author), Northeastern Univ, Coll Sci, Dept Phys, Shenyang 110004, Peoples R China.
英文摘要	The CPL parametrization is very important for investigating the property of dark energy with observational data. However, the CPL parametrization only respects the past evolution of dark energy but does not care about the future evolution of dark energy, since w(z) diverges in the distant future. In a recent paper [J.Z. Ma, X. Zhang, Phys. Lett. B 699 (2011) 233], a robust, novel parametrization for dark energy, w(z) = w(0) + w(1)(In(2+z)/1+z - In2), has been proposed, successfully avoiding the future divergence problem in the CPL parametrization. On the other hand, an oscillating parametrization (motivated by an oscillating quintom model) can also avoid the future divergence problem. In this Letter, we use the two divergence-free parametrizations to probe the dynamics of dark energy in the whole evolutionary history. In light of the data from 7-year WMAP temperature and polarization power spectra, matter power spectrum of SDSS DR7, and SN la Union2 sample, we perform a full Markov Chain Monte Carlo exploration for the two dynamical dark energy models. We find that the best-fit dark energy model is a quintom model with the EOS across -1 during the evolution. However, though the quintom model is more favored, we find that the cosmological constant still cannot be excluded. (C) 2011 Elsevier B.V. All rights reserved.
学科主题	Physics
类目[WOS]	Physics, Multidisciplinary
收录类别	SCI
WOS记录号	WOS:000295105500003
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/226287]
专题	高能物理研究所_粒子天体物理中心
推荐引用方式 GB/T 7714	AMS Collaboration. Probing the dynamics of dark energy with divergence-free parametrizations: A global fit study[J]. PHYSICS LETTERS B,2011,703(2):#REF!.
APA	AMS Collaboration.(2011).Probing the dynamics of dark energy with divergence-free parametrizations: A global fit study.PHYSICS LETTERS B,703(2),#REF!.
MLA	AMS Collaboration."Probing the dynamics of dark energy with divergence-free parametrizations: A global fit study".PHYSICS LETTERS B 703.2(2011):#REF!.