MODELING TIME-VARYING DARK ENERGY WITH CONSTRAINTS FROM LATEST OBSERVATIONS

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	MODELING TIME-VARYING DARK ENERGY WITH CONSTRAINTS FROM LATEST OBSERVATIONS
	Wu, YL
刊名	MODERN PHYSICS LETTERS A
	2012
卷号	27 期号:10 页码:1250030
关键词	DIGITAL SKY SURVEY HUBBLE-SPACE-TELESCOPE COSMOLOGICAL CONSTANT GEOMETRIC DISTANCE GALAXY NGC-4258 SUPERNOVAE MATTER SCALE OSCILLATIONS QUINTESSENCE
ISSN号	0217-7323
通讯作者	Zhang, QJ (reprint author), Chinese Acad Sci, Grad Univ, Dept Phys, Beijing 100049, Peoples R China.
英文摘要	We introduce a set of two parameter models for the dark energy equation of state (FOS) w(z) to investigate time-varying dark energy. The models are classified into two types according to their boundary behaviors at the redshift, z = (0, infinity) and their local extremum properties. A joint analysis based on four observations (SNe + BAO + CMB + H-0) is carried out to constrain all the models. It is shown that all models get almost the same chi(2)(min) similar or equal to 469 and the cosmological parameters (Omega(M), h, Omega(b)h(2)) with the best-fit results (0.28, 0.70, 2.24), although the constraint results on two parameters (w(0), w(1)) and the allowed regions for the EOS w(z) are sensitive to different models and a given extra model parameter. For three of Type I models which have similar functional behaviors with the so-called CPL model, the constrained two parameters w(0) and w(1) have have negative correlation and are compatible with the ones in CPL model, and the allowed regions of w(z) get a narrow node at z similar to 0.2. The best-fit results from the most stringent constraints straints in Model Ia give (w(0), w(1)) = (-0.96(-0.21)(+0.26), -0.12(-0.89)(+0.61)) which may compare with the best-fit results (w(0), w(1)) = (-0.97(-0.18)(+0.22), -0.15-(+0.85)(1.33)) in the CPL model. For four of Type II models which. have logarithmic function forms and an extremum point, the allowed regions of w(z) are found to be sensitive to different models and a given extra parameter. It is interesting to obtain two models in which two parameters w(0) and w(1) are strongly correlative and appropriately reduced to one parameter by a linear relation w(1) proportional to (1 + w(0)).
学科主题	Physics
收录类别	SCI
资助信息	National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science
原文出处	http://dx.doi.org/10.1142/S0217732312500307
语种	英语
WOS记录号	WOS:000302314000002
公开日期	2014-04-25
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/15136]
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	Wu, YL. MODELING TIME-VARYING DARK ENERGY WITH CONSTRAINTS FROM LATEST OBSERVATIONS[J]. MODERN PHYSICS LETTERS A,2012,27(10):1250030.
APA	Wu, YL.(2012).MODELING TIME-VARYING DARK ENERGY WITH CONSTRAINTS FROM LATEST OBSERVATIONS.MODERN PHYSICS LETTERS A,27(10),1250030.
MLA	Wu, YL."MODELING TIME-VARYING DARK ENERGY WITH CONSTRAINTS FROM LATEST OBSERVATIONS".MODERN PHYSICS LETTERS A 27.10(2012):1250030.