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Cosmic microwave background with Brans-Dicke gravity. II. Constraints with the WMAP and SDSS data
Wu, Feng-Quan; Chen, Xuelei
2010-10-13
发表期刊PHYSICAL REVIEW D
卷号82期号:8
摘要Using the covariant formalism developed in a companion paper [F.-Q. Wu, L. E. Qiang, X. Wang, and X. Chen, preceding Article, Phys. Rev. D 82, 083002 (2010)] (paper I), we derive observational constraints on the Brans-Dicke model in a flat Friedmann-Lemaitre-Robertson-Walker universe with a cosmological constant and cold dark matter. The CMB observations we use include the Wilkinson Microwave Anisotropy Probe 5 yr data, the Arcminute Cosmology Bolometer Array Receiver 2007 data, the Cosmic Background Imager polarization data, and the Balloon Observations of Millimetric Extragalactic Radiation and Geophysics 2003 flight data. For the large scale structure we use the matter power spectrum data measured with the luminous red galaxy survey of the Sloan Digital Sky Survey Data Release 4. We parametrize the Brans-Dicke parameter omega with a new parameter zeta = ln(1/omega + 1), and use the Markov-Chain Monte Carlo method to explore the parameter space. We find that using CMB data alone, one could place some constraints on positive zeta or omega but negative zeta or omega could not be constrained effectively. However, with additional large scale structure data, one could break the degeneracy at zeta < 0. The 2 sigma (95.5%) bound on zeta is -0.008 37 < zeta < 0.01018 (corresponding to omega < -120.0 or omega > 97.8). We also obtained constraints on (G)over dot/G, the rate of change of G at present, as -1.75 x 10(-12) yr(-1) < (G)over dot/G < 1.05 x 10(-12) yr(-1), and (G)over dot/G, the total variation of G since the epoch of recombination, as -0.083 < delta G/G < 0.095 at the 2 sigma confidence level.
DOI10.1103/PhysRevD.82.083003
收录类别SCI
语种英语
WOS记录号WOS:000282874300002
引用统计
被引频次:28[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7792
专题星系宇宙学研究部
作者单位Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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Wu, Feng-Quan,Chen, Xuelei. Cosmic microwave background with Brans-Dicke gravity. II. Constraints with the WMAP and SDSS data[J]. PHYSICAL REVIEW D,2010,82(8).
APA Wu, Feng-Quan,&Chen, Xuelei.(2010).Cosmic microwave background with Brans-Dicke gravity. II. Constraints with the WMAP and SDSS data.PHYSICAL REVIEW D,82(8).
MLA Wu, Feng-Quan,et al."Cosmic microwave background with Brans-Dicke gravity. II. Constraints with the WMAP and SDSS data".PHYSICAL REVIEW D 82.8(2010).
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