2008/08/24 by Aniruddha Palit, A. Palit, Alla Panchenko +5
Physics and Astronomy · #Black Holes and Theoretical Physics #Pulsars and Gravitational Waves Research #Quantum Electrodynamics and Casimir Effect #gr-qc
paper · pdf · doi:10.1007/s10773-008-9899-3
published as Int. J. Theor. Phys. 48, 1271-1289 (2009) · 20 pages. Accepted for publication in Int. J. theor. Phys
arxiv created 2008/08/24 · openalex publication_date 2008/11/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.