Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2008-08-24
Int. J. Theor. Phys. 48, 1271-1289 (2009)
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
20 pages. Accepted for publication in Int. J. theor. Phys
Scientific paper
10.1007/s10773-008-9899-3
Phase space method provides a novel way for deducing qualitative features of nonlinear differential equations without actually solving them. The method is applied here for analyzing stability of circular orbits of test particles in various physically interesting environments. The approach is shown to work in a revealing way in Schwarzschild spacetime. All relevant conclusions about circular orbits in the Schwarzschild-de Sitter spacetime are shown to be remarkably encoded in a single parameter. The analysis in the rotating Kerr black hole readily exposes information as to how stability depends on the ratio of source rotation to particle angular momentum. As a wider application, it is exemplified how the analysis reveals useful information when applied to motion in a refractive medium, for instance, that of optical black holes.
Bhadra Arunava
Migranov Nail G.
Nandi Kamal Kanti
Palit Aniruddha
Panchenko Alexander
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