ITP OpenIR  > 理论物理所2013年知识产出
Growth index after the Planck results
Xu, LX; Xu, LX (reprint author), Dalian Univ Technol, Inst Theoret Phys, Sch Phys & Optoelect Technol, Dalian 116024, Peoples R China.
2013
发表期刊PHYSICAL REVIEW D
ISSN1550-7998
卷号88期号:8页码:84032
摘要The growth index gamma L was proposed to investigate the possible deviation from the standard Lambda CDM model and Einstein's gravity theory in a dynamical perspective. Recently, thanks to the measurement of the cosmic growth rate via the redshift-space distortion, one can understand the evolution of the density contrast through f sigma(8)(z), where f(z) = d ln delta/d ln a is the growth rate of matter and sigma(8)(z) is the rms amplitude of the density contrast delta at the comoving 8h(-1) Mpc scale. In this paper, we use the redshift-space distortion data points to study the growth index on the bases of Einstein's gravity theory and a modified gravity theory under the assumption of f = Omega(m)(a)(gamma L). The cosmic background evolution is fixed by the cosmic observations from the type Ia supernovae SNLS3 data, cosmic microwave background radiation data from Planck, and baryon acoustic oscillations. Via the Markov Chain Monte Carlo method, we find the following gamma L values for Einstein's gravity with a cosmological constant (w = const) dark energy and a modified gravity theory in the 1, 2, and 3 sigma regions, respectively: 0.675(-0.0662-0.120-0.155)(+0.0611+0.129+0.178),0.745(-0.0819-0.146-0.190)(+0.0755+0.157+0.205), and 0.555(-0.0167-0.0373-0.0516)(+0.0193+0.0335+0.0436). In Einstein's gravity theory, the values of the growth index gamma L show an almost 2 sigma deviation from the theoretical prediction of 6/11 for the Lambda CDM model. However, in the modified gravity framework, a deviation from Einstein's relativity is not detected in the 1 sigma region. This implies that the currently available cosmic observations do not predict an alternative modified gravity theory beyond the Lambda CDM model under Einstein's gravity, but that the simple assumption of f = Omega(gamma L)(m) should be improved.
部门归属[Xu, Lixin] Dalian Univ Technol, Inst Theoret Phys, Sch Phys & Optoelect Technol, Dalian 116024, Peoples R China; [Xu, Lixin] Dalian Univ Technol, Coll Adv Sci & Technol, Dalian 116024, Peoples R China; [Xu, Lixin] Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China
关键词Dark Energy Cosmological Constant Linear Perturbations Modified Gravity Dgp Model Lambda Constraints Supernovae Density Omega
学科领域Physics
资助者NSFC [11275035]; Fundamental Research Funds for the Central Universities [DUT13LK01] ; NSFC [11275035]; Fundamental Research Funds for the Central Universities [DUT13LK01] ; NSFC [11275035]; Fundamental Research Funds for the Central Universities [DUT13LK01] ; NSFC [11275035]; Fundamental Research Funds for the Central Universities [DUT13LK01]
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收录类别SCI
语种英语
资助者NSFC [11275035]; Fundamental Research Funds for the Central Universities [DUT13LK01] ; NSFC [11275035]; Fundamental Research Funds for the Central Universities [DUT13LK01] ; NSFC [11275035]; Fundamental Research Funds for the Central Universities [DUT13LK01] ; NSFC [11275035]; Fundamental Research Funds for the Central Universities [DUT13LK01]
WOS记录号WOS:000326107300009
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被引频次:15[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/311006/15264
专题理论物理所2013年知识产出
通讯作者Xu, LX (reprint author), Dalian Univ Technol, Inst Theoret Phys, Sch Phys & Optoelect Technol, Dalian 116024, Peoples R China.
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GB/T 7714
Xu, LX,Xu, LX . Growth index after the Planck results[J]. PHYSICAL REVIEW D,2013,88(8):84032.
APA Xu, LX,&Xu, LX .(2013).Growth index after the Planck results.PHYSICAL REVIEW D,88(8),84032.
MLA Xu, LX,et al."Growth index after the Planck results".PHYSICAL REVIEW D 88.8(2013):84032.
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