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MODELING TIME-VARYING DARK ENERGY WITH CONSTRAINTS FROM LATEST OBSERVATIONS
Zhang, QJ; Wu, YL; Zhang, QJ (reprint author), Chinese Acad Sci, Grad Univ, Dept Phys, Beijing 100049, Peoples R China.
2012
发表期刊MODERN PHYSICS LETTERS A
ISSN0217-7323
卷号27期号:10页码:1250030
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)).
部门归属[Zhang, Qing-Jun] Chinese Acad Sci, Grad Univ, Dept Phys, Beijing 100049, Peoples R China; [Zhang, Qing-Jun; Wu, Yue-Liang] Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China
关键词Digital Sky Survey Hubble-space-telescope Cosmological Constant Geometric Distance Galaxy Ngc-4258 Supernovae Matter Scale Oscillations Quintessence
学科领域Physics
资助者National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science ; National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science ; National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science ; National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science ; National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science ; National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science ; National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science ; National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science
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收录类别SCI
语种英语
资助者National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science ; National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science ; National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science ; National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science ; National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science ; National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science ; National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science ; National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science
WOS记录号WOS:000302314000002
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被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/15136
专题理论物理所SCI论文
通讯作者Zhang, QJ (reprint author), Chinese Acad Sci, Grad Univ, Dept Phys, Beijing 100049, Peoples R China.
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Zhang, QJ,Wu, YL,Zhang, QJ . MODELING TIME-VARYING DARK ENERGY WITH CONSTRAINTS FROM LATEST OBSERVATIONS[J]. MODERN PHYSICS LETTERS A,2012,27(10):1250030.
APA Zhang, QJ,Wu, YL,&Zhang, QJ .(2012).MODELING TIME-VARYING DARK ENERGY WITH CONSTRAINTS FROM LATEST OBSERVATIONS.MODERN PHYSICS LETTERS A,27(10),1250030.
MLA Zhang, QJ,et al."MODELING TIME-VARYING DARK ENERGY WITH CONSTRAINTS FROM LATEST OBSERVATIONS".MODERN PHYSICS LETTERS A 27.10(2012):1250030.
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