Scale Transformation, Modified Gravity, and Brans-Dicke Theory

被引:2
|
作者
Darabi, F. [1 ]
机构
[1] Azerbaijan Univ Tarbiat Moallem, Dept Phys, Tabriz 53714161, Iran
关键词
Scale transformation; Modified gravity; Brans-Dicke theory; DARK ENERGY; COSMOLOGICAL CONSTANT;
D O I
10.1007/s10773-010-0398-y
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A model of Einstein-Hilbert action subject to the scale transformation is studied. By introducing a dilaton field as a means of scale transformation a new action is obtained whose Einstein field equations are consistent with traceless matter with non-vanishing modified terms together with dynamical cosmological and gravitational coupling terms. The obtained modified Einstein equations are neither those in f(R) metric formalism nor the ones in f(R) Palatini formalism, whereas the modified source terms are formally equivalent to those of f(R) = 1/2 R(2) gravity in Palatini formalism. The correspondence between the present model, the modified gravity theory, and Brans-Dicke theory with omega = -3/2 is explicitly shown, provided the dilaton field is condensated to its vacuum state.
引用
收藏
页码:2113 / 2120
页数:8
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