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gr-qc2025
Unbounded Radius of Innermost Stable Circular Orbit in Higher-Dimensional Black Holes
Hocheol Lee, Bogeun Gwak
The innermost stable circular orbit (ISCO) offers a fundamental test of spacetime structure. However, its behavior in higher-dimensional black holes influenced by anisotropic energ…
gr-qc2025
Frame Dependence of Bound on Lyapunov Exponent in Dilatonic Reissner-Nordström-AdS and Kerr-Sen-AdS Black Holes
Hocheol Lee, Bogeun Gwak
We investigate the frame dependence of the Lyapunov exponent bound for charged particles in dilatonic Reissner-Nordström-AdS and Kerr-Sen-AdS black hole backgrounds, derived from E…
gr-qc2025
Bound on Lyapunov exponent for a charged particle in Kerr-Sen-AdS Black Hole
Hocheol Lee, Bogeun Gwak
We investigate the upper bound of the Lyapunov exponent for a charged particle in the Gibbons--Maeda--Garfinkle--Horowitz--Strominger (GMGHS)--AdS and Kerr--Sen--AdS black hole bac…