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Time-varying dark energy constraints from the latest SN Ia, BAO and SGL
Zhang, Qing-Jun; Wu, Yue-Liang; 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
2010
发表期刊JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
ISSN1475-7516
期号8页码:-
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.
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
关键词Hubble-space-telescope Digital Sky Survey Cosmological Consequences Distant Supernovae Data Set Constant Models Peak Component Matter
学科领域Physics
资助者National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science
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收录类别SCI
资助者National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science ; National Science Foundation of China (NSFC)[10821504, 10491306]; Chinese Academy of Science
WOS记录号WOS:000283575000002
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被引频次:3[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/311006/5068
专题理论物理所SCI论文
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
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Zhang, Qing-Jun,Wu, Yue-Liang,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. Time-varying dark energy constraints from the latest SN Ia, BAO and SGL[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2010(8):-.
APA Zhang, Qing-Jun,Wu, Yue-Liang,&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.(2010).Time-varying dark energy constraints from the latest SN Ia, BAO and SGL.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(8),-.
MLA Zhang, Qing-Jun,et al."Time-varying dark energy constraints from the latest SN Ia, BAO and SGL".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .8(2010):-.
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