Post-Newtonian parameters and cosmological constant of screened modified gravity

被引：31
作者：
Zhang, Xing [1 ]
Zhao, Wen [1 ]
Huang, He [1 ]
Cai, Yifu [1 ]
机构：
[1] Univ Sci & Technol China, Chinese Acad Sci, CAS Key Lab Res Galaxies & Cosmol, Dept Astron, Hefei 230026, Anhui, Peoples R China
来源：
PHYSICAL REVIEW D | 2016年 / 93卷 / 12期
关键词：
GENERAL-RELATIVITY; DARK ENERGY; QUINTESSENCE; CONSTRAINTS; COMPONENT; DYNAMICS; EQUATION; LAMBDA;
D O I：
10.1103/PhysRevD.93.124003
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Screened modified gravity (SMG) is a kind of scalar-tensor theory with screening mechanisms, which can generate a screening effect to suppress the fifth force in high density environments and pass the solar system tests. Meanwhile, the potential of the scalar field in the theories can drive the acceleration of the late Universe. In this paper, we calculate the parametrized post-Newtonian (PPN) parameters gamma and beta, the effective gravitational constant G(eff), and the effective cosmological constant. for SMG with a general potential V and coupling function A. The dependence of these parameters on the model parameters of SMG and/or the physical properties of the source object are clearly presented. As an application of these results, we focus on three specific theories of SMG (chameleon, symmetron, and dilaton models). Using the formulas to calculate their PPN parameters and cosmological constant, we derive the constraints on the model parameters by combining the observations on solar system and cosmological scales.
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页数：16
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