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Xu, LX; Xu, LX (reprint author), Dalian Univ Technol, Inst Theoret Phys, Sch Phys & Optoelect Technol, Dalian 116024, Peoples R China.
Growth index after the Planck results
Source PublicationPHYSICAL REVIEW D
Language英语
KeywordDark Energy Cosmological Constant Linear Perturbations Modified Gravity Dgp Model Lambda Constraints Supernovae Density Omega
AbstractThe 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.
2013
ISSN1550-7998
Volume88Issue:8Pages:84032
Subject AreaPhysics
Indexed BySCI
Funding OrganizationNSFC [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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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/15264
Collection理论物理所科研产出_SCI论文
Corresponding AuthorXu, LX (reprint author), Dalian Univ Technol, Inst Theoret Phys, Sch Phys & Optoelect Technol, Dalian 116024, Peoples R China.
Recommended Citation
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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