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题名: Time-varying dark energy constraints from the latest SN Ia, BAO and SGL
作者: Zhang, Qing-Jun ;  Wu, Yue-Liang
刊名: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
出版日期: 2010
期号: 8, 页码:-
关键词: HUBBLE-SPACE-TELESCOPE ;  DIGITAL SKY SURVEY ;  COSMOLOGICAL CONSEQUENCES ;  DISTANT SUPERNOVAE ;  DATA SET ;  CONSTANT ;  MODELS ;  PEAK ;  COMPONENT ;  MATTER
学科分类: Physics
通讯作者: Zhang, QJ , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Kavli Inst Theoret Phys China, Zhong Guan Cun E St 55, Beijing 100190, Peoples R China
部门归属: [Zhang, QJ; Wu, YL] Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China; [Zhang, QJ] Chinese Acad Sci, Grad Univ, Dept Phys, Beijing 100049, Peoples R China
英文摘要: Based on the latest SNe Ia data provided by Hicken et al. (2009) with using MLCS17 light curve fitter, together with the Baryon Acoustic Oscillation (BAO) and strong gravitational lenses (SGL), we investigate the constraints on the dark energy equation-of-state parameter w in the flat universe, especially for the time-varying case w(z) = w(0) + w(z)z/(1+z). The constraints from SNe data alone are found to be: (a) (Omega(M), w) = (0.358, -1.09) as the best-fit results; (b) (w(0), w(z)) = (-0.73(-0.97)(+0.23), 0.84(-10.34)(+1.66)) for the two parameters in the time-varying case after marginalizing the parameter Omega(M); (c) the likelihood of parameter w(z) has a high non-Gaussian distribution; (d) an extra restriction on Omega(M) is necessary to improve the constraint of the SNe Ia data on the parameters (w(0), w(z)). A joint analysis of SNe Ia data and BAO is made to break the degeneracy between w and Omega(M), and leads to the interesting maximum likelihoods w(0) = -0.94 and w(z) = 0. When marginalizing the parameter Omega(M), the fitting results are found to be (w(0), w(z)) = (-0.95(-0.18)(+0.45), 0.41(-0.96)(+0.79)). After adding the splitting angle statistic of SGL data, a consistent constraint is obtained (Omega(M), w) = (0.298, -0.907) and the constraints on time-varying dark energy are further improved to be (w(0), w(z)) = (-0.92(-0.10)(+0.14), 0.35(-0.54)(+0.47)), which indicates that the phantom type models are disfavored.
资助者: National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000283575000002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5068
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Zhang, Qing-Jun,Wu, Yue-Liang. Time-varying dark energy constraints from the latest SN Ia, BAO and SGL[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2010(8):-.
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