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arXiv 1504.02686gr-qc
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标量张量理论中的变换性质和广义相对论

Transformation properties and general relativity regime in scalar-tensor theories

Laur Jarv, Piret Kuusk, Margus Saal, Ott Vilson

摘要:

我们认为第一代标量张量引力理论在一个完全通用的形式,保持局部尺度的度量和标量场的重新定义明确不同的耦合功能的作用的转换功能。众所周知,在Jordan标架Brans-Dicke型参数化中,发散的动力学耦合函数$ω\rightarrow \infty$可以导致广义相对论区域,然而到其他参数化的转换函数通常会变得奇异,可能破坏不同参数化之间的对应关系。本文详细分析了任意度规的场方程和Friedmann宇宙学中的场方程的变换性质,给出了即使变换是奇异的,不同参数化之间保持对应的充分条件。有趣的是,我们看到了广义相对论概念的不变性,以及微扰宇宙学方程及其解在不同参数化下的对应性,尽管在某些情况下,微扰方程在一种参数化下是线性的,而在另一种参数化下是非线性的。

英文摘要:

We consider first generation scalar-tensor theories of gravitation in a completely generic form, keeping the transformation functions of the local rescaling of the metric and the scalar field redefinition explicitly distinct from the coupling functions in the action. It is well known that in the Jordan frame Brans-Dicke type parametrization the diverging kinetic coupling function $ω\rightarrow \infty$ can lead to the general relativity regime, however then the transformation functions to other parametrizations typically become singular, possibly spoiling the correspondence between different parametrizations. We give a detailed analysis of the transformation properties of the field equations with arbitrary metric and also in the Friedmann cosmology, and provide sufficient conditions under which the correspondence between different parametrizations is retained, even if the transformation is singular. It is interesting to witness the invariance of the notion of the general relativity regime and the correspondence of the perturbed cosmological equations as well as their solutions in different parametrizations, despite the fact that in some cases the perturbed equation turns out to be linear in one parametrization and nonlinear in some other.

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