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arXiv 1306.4927gr-qchep-th
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规范不变引力微扰的广义形式

Generalized Formalism in Gauge-Invariant Gravitational Perturbations

Rong-Gen Cai, Li-Ming Cao

摘要:

利用Kodama和Ishibashi提出的规范不变变量,我们得到了具有翘曲积度规的$(m+n)$维时空中最一般的微扰方程.这些方程不依赖于$n$维Einstein流形上Laplace型算子的谱展开。这些方程使我们有一个完整的规范不变微扰理论和一个定义良好的频谱展开的所有模式和规范不变保持每一个模式。通过研究Weyl张量的某些投影在$m=2$情形下的扰动,定义了三个Teukolsky类规范不变变量,并考虑$(2+n)$维Einstein谱时Penrose波动方程的扰动,得到了这些变量的扰动方程.特别是,我们发现Teukolsky的规范不变变量和Kodama-Ishibashi规范不变变量之间的关系。这些关系意味着Kodama-Ishibashi规范不变变量都来自时空Weyl张量的微扰。

英文摘要:

By use of the gauge-invariant variables proposed by Kodama and Ishibashi, we obtain the most general perturbation equations in the $(m+n)$-dimensional spacetime with a warped product metric. These equations do not depend on the spectral expansions of the Laplace-type operators on the $n$-dimensional Einstein manifold. These equations enable us to have a complete gauge-invariant perturbation theory and a well-defined spectral expansion for all modes and the gauge invariance is kept for each mode. By studying perturbations of some projections of Weyl tensor in the case of $m=2$, we define three Teukolsky-like gauge-invariant variables and obtain the perturbation equations of these variables by considering perturbations of the Penrose wave equations in the $(2+n)$-dimensional Einstein spectime. In particular, we find the relations between the Teukolsky-like gauge-invariant variables and the Kodama-Ishibashi gauge-invariant variables. These relations imply that the Kodama-Ishibashi gauge-invariant variables all come from the perturbations of Weyl tensor of the spacetime.

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