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arXiv 1902.05129gr-qc
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边界轨道:1静态时空

Boundary Orbits: 1 Static Spacetimes

Sheref Nasereldin, Kayll Lake

摘要:

时空中圆轨道的研究具有天体物理学的重要性。在静态和静止时空中的圆形轨道的识别和分类仍然是一个活跃的感兴趣领域。即使在最简单的静态球对称情况下,众所周知,在真空中引入宇宙学常数会导致研究四次多项式,以便定位\textit{boundary orbits},即那些跨越稳定和不稳定轨道的轨道。这些轨道通常被称为“边际稳定轨道”或“无差别稳定轨道”。一个全面的研究文本提供了很少的澄清,这些边界轨道的稳定性或不稳定性。在这里,我们认为,直接使用二阶微扰理论立即表明,这些边界轨道是不稳定的微扰意义。我们的研究包括两粒子Curzon-Chazy解。

英文摘要:

The study of circular orbits in spacetime is of astrophysical importance. The identification and classification of circular orbits in both static and stationary spacetimes remains an active area of interest. Even in the simplest static spherically symmetric case, it is well known that the introduction of a cosmological constant in vacuum leads to the study of quartic polynomials in order to locate \textit{boundary orbits}, those that straddle between stable and unstable orbits. These orbits are often referred to as `marginally stable orbits' or `indifferently stable orbits'. A comprehensive study of texts offers little clarification as to the stability or instability of these boundary orbits. Here we argue that the direct use of second order perturbation theory immediately shows that these boundary orbits are unstable in the perturbative sense. Our study here includes the two-particle Curzon-Chazy solution.

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