2006/11/30 by Galin Gyulchev, Galin N. Gyulchev, Stoytcho S. Yazadjiev · 3 citations
Physics and Astronomy · #Angular momentum #Astrophysical Phenomena and Observations #Axial symmetry #Black Holes and Theoretical Physics #Black hole (networking) #Charged black hole #Classical mechanics #Extremal black hole #Galaxy #Gravitation #Gravitational lens #Physics #Pulsars and Gravitational Waves Research #Quantum electrodynamics #Quantum mechanics #Redshift #Ring singularity #Rotating black hole #Schwarzschild radius #Spin-flip #astro-ph #de Sitter–Schwarzschild metric #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevd.75.023006
published as Phys.Rev.D75:023006,2007 · 31 pages, 17 figures; V2 references added, some typos corrected, V3 references added, language corrections, V4 table added, minor technical corrections
openalex publication_date 2007/01/17 · arxiv created 2007/03/29 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In the present work we study numerically quasiequatorial lensing by the charged, stationary, axially symmetric Kerr-Sen dilaton-axion black hole in the strong deflection limit. In this approximation we compute the magnification and the positions of the relativistic images. The most outstanding effect is that the Kerr-Sen black hole caustics drift away from the optical axis and shift in the clockwise direction with respect to the Kerr caustics. The intersections of the critical curves on the equatorial plane as a function of the black hole angular momentum are found, and it is shown that they decrease with the increase of the parameter Q2/M. All of the lensing quantities are compared to particular cases as Schwarzschild, Kerr, and Gibbons-Maeda black holes.