Growth index after the Planck results
文献类型：期刊论文
| 作者 | Xu, LX |
| 刊名 | PHYSICAL REVIEW D
 |
| 出版日期 | 2013 |
| 卷号 | 88期号:8页码:84032 |
| 关键词 | DARK ENERGY COSMOLOGICAL CONSTANT LINEAR PERTURBATIONS MODIFIED GRAVITY DGP MODEL LAMBDA CONSTRAINTS SUPERNOVAE DENSITY OMEGA |
| ISSN号 | 1550-7998 |
| 通讯作者 | Xu, LX (reprint author), Dalian Univ Technol, Inst Theoret Phys, Sch Phys & Optoelect Technol, Dalian 116024, Peoples R China. |
| 英文摘要 | 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. |
| 学科主题 | Physics |
| 收录类别 | SCI |
| 资助信息 | NSFC [11275035]; Fundamental Research Funds for the Central Universities [DUT13LK01] |
| 原文出处 | http://dx.doi.org/10.1103/PhysRevD.88.084032 |
| 语种 | 英语 |
| WOS记录号 | WOS:000326107300009 |
| 公开日期 | 2014-04-25 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/15264]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 推荐引用方式 GB/T 7714 | Xu, LX. Growth index after the Planck results[J]. PHYSICAL REVIEW D,2013,88(8):84032. |
| APA | Xu, LX.(2013).Growth index after the Planck results.PHYSICAL REVIEW D,88(8),84032. |
| MLA | Xu, LX."Growth index after the Planck results".PHYSICAL REVIEW D 88.8(2013):84032. |
入库方式： OAI收割
来源：理论物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。