A modified variational principle for gravity in the modified Weyl geometry

A modified variational principle for gravity in the modified Weyl geometry
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修正外尔几何中重力的修正变分原理

DOI:
10.1088/0264-9381/30/19/195008
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发表时间:
2013-01
影响因子:
3.5
通讯作者:
Huang Yong-Chang
Huang Yong-Chang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Yuan, Fang-Fang**;Huang Yong-Chang

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相似文献

外尔几何的通常解释在两个意义上作了修改。首先,将加性Weyl联络及其变分都看作是在Weyl协变导数作用下的(1,2)张量.其次,引入了一个修正的协变导数算子,它仍然保持了理论的张量结构。在它的帮助下,外尔几何中的黎曼张量可以写成更紧凑的形式。我们从几个方面详细论证了这种修改,并在此过程中获得了一些沿着的启示。通过对张量在Weyl协变导数作用下的变化引入一些新的变换规则,我们得到了Riemann张量的Palatini恒等式的Weyl形式.为了导出外尔几何中的能量动量张量和引力运动方程,首先自然地应用这个恒等式,然后将加外尔联络的变分变换为度规张量和外尔规范场的变分。我们还讨论了可能的连接到目前的文献上的Weyl不变的大质量引力和f(R)引力的变分原理的扩展。
The usual interpretation of the Weyl geometry is modified in two senses. First, both the additive Weyl connection and its variation are treated as (1, 2) tensors under the action of the Weyl covariant derivative. Second, a modified covariant derivative operator is introduced which still preserves the tensor structure of the theory. With its help, the Riemann tensor in the Weyl geometry can be written in a more compact form. We justify this modification in detail from several aspects and obtain some insights along the way. By introducing some new transformation rules for the variation of tensors under the action of the Weyl covariant derivative, we find a Weyl version of the Palatini identity for the Riemann tensor. To derive the energy–momentum tensor and equations of motion for gravity in the Weyl geometry, one naturally applies this identity at first, and then converts the variation of the additive Weyl connection to those of the metric tensor and Weyl gauge field. We also discuss possible connections to the current literature on the Weyl-invariant extension of massive gravity and the variational principles in f(R) gravity.
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