Abstract
We give the formulation of the gravitational lensing theory in the strong field limit for a Schwarzschild black hole as a counterpart to the weak field approach. It is possible to expand the full black hole lens equation to work a simple analytical theory that describes the physics in the strong field limit at a high accuracy degree. In this way, we derive compact and reliable mathematical formulae for the position of additional critical curves, relativistic images and their magnification, arising in this limit.
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Bozza, V., Capozziello, S., Iovane, G. et al. Strong Field Limit of Black Hole Gravitational Lensing. General Relativity and Gravitation 33, 1535–1548 (2001). https://doi.org/10.1023/A:1012292927358
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DOI: https://doi.org/10.1023/A:1012292927358