Kerr-Sen dilaton-axion black hole lensing in the strong deflection limit
Kerr-Sen dilaton-axion black hole lensing in the strong deflection limit
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 …