三维旋转形式
形式主义(音乐)
万有引力
引力常数
物理
理论物理学
数学物理
经典力学
数学
几何学
艺术
音乐剧
视觉艺术
作者
Jianbo Lu,Mou Xu,Jie Wang,Yan Liu,Zhitong Zhuang
出处
期刊:Journal of high energy physics, gravitation and cosmology
[Scientific Research Publishing, Inc.]
日期:2022-01-01
卷期号:08 (04): 874-889
标识
DOI:10.4236/jhepgc.2022.84059
摘要
Geometrical diagnostic methods were often applied to distinguish the gravitational models. But it is scarce to investigate the differences between the different formalisms of modified gravitational theories (e.g. the metric formalism and the Palatini formalism). In this paper, we discriminate the gravitational theory with the different formalisms by using the geometrical diagnostic methods. For a considered modified theory of gravity (e.g. the f(R) theory or GBD theory), we can see that the difference between the two formalisms is remarkable according to the diagnostic results. And relative to the ΛCDM model, there are more deviations in metric formalism than those in Palatini formalism, according to the {r, s} diagnostic. Given that the GBD (generalized Brans-Dicke theory) is a time-variable Newton gravitational constant (VG) theory, the differences between the VG theory and the constant-G theory are studied. It indicates that the variation of Newton’s gravitational constant could induce notable effects on geometrical quantities (e.g. r, s and q) in both metric formalism and Palatini formalism.
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