Constraints on the generalized tachyon field models from latest observational data
Yang, RJ; Zhang SN(张双南); Zhang, SN; Liu, Y
刊名JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
2008
期号1页码:17
关键词dark energy theory supernova type Ia
学科分类Astronomy & Astrophysics; Physics
DOI10.1088/1475-7516/2008/01/017
通讯作者[Yang, Rong Jia ; Zhang, Shuang Nan ; Liu, Yuan] Tsinghua Univ, Ctr Astrophys, Dept Phys, Beijing 100084, Peoples R China ; [Zhang, Shuang Nan] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China ; [Zhang, Shuang Nan] Univ Alabama, Dept Phys, Huntsville, AL 35899 USA
文章类型Review
英文摘要We consider constraints on generalized tachyon field (GTF) models from latest observational data (including 182 gold SNIa data, the shift parameter, and the acoustic scale). We obtain at 68.3% confidence level Omega m = 0.37 +/- 0.01, k(0) = 0.09(-0.03)(+0.04), alpha = 1.8(-0.7)(+7.4) (the best fit values of the parameters) and z(q=0) similar to 0.47 - 0.51 (the transitional redshift) for GTF as the dark energy component only; k(0) = 0.21(-0.18)(+0.20), alpha = 0.57 +/- 0.01 and z(q=0) similar to 0.49-0.68 for GTF as the unification of dark energy and dark matter. In both cases, GTF evolves like dark matter in the early universe. By applying model- comparison statistics and testing with independent H(z) data, we find that the GTF dark energy scenario is favored over the Lambda CDM model, and the Lambda CDM model is favored over GTF unified dark matter by the combined data. For GTF as the dark energy component, the fluctuations of matter density are consistent with the growth of linear density perturbations. For GTF unified dark matter, the growth of GTF density fluctuations goes more slowly for a --> 1, meaning that GTF does not behave as classical Lambda CDM scenarios.
类目[WOS]Astronomy & Astrophysics ; Physics, Particles & Fields
研究领域[WOS]Astronomy & Astrophysics ; Physics
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语种英语
WOS记录号WOS:000252932200015
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被引频次:13[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240361
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
作者单位中国科学院高能物理研究所
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Yang, RJ,Zhang SN,Zhang, SN,et al. Constraints on the generalized tachyon field models from latest observational data[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2008(1):17.
APA Yang, RJ,张双南,Zhang, SN,&Liu, Y.(2008).Constraints on the generalized tachyon field models from latest observational data.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(1),17.
MLA Yang, RJ,et al."Constraints on the generalized tachyon field models from latest observational data".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .1(2008):17.
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