TL;DR
This paper reviews the theoretical foundations of gravitational lensing by black holes, exploring effects of black hole spin and observational prospects for detecting lensing phenomena.
Contribution
It provides a comprehensive overview of black hole lensing, including spherically symmetric and spinning black holes, and discusses observational strategies and implications.
Findings
Formation of infinite higher order images in spherical black holes
Effects of black hole spin on caustics and multiple images
Potential for observing black hole lensing phenomena
Abstract
We review the theoretical aspects of gravitational lensing by black holes, and discuss the perspectives for realistic observations. We will first treat lensing by spherically symmetric black holes, in which the formation of infinite sequences of higher order images emerges in the clearest way. We will then consider the effects of the spin of the black hole, with the formation of giant higher order caustics and multiple images. Finally, we will consider the perspectives for observations of black hole lensing, from the detection of secondary images of stellar sources and spots on the accretion disk to the interpretation of iron K-lines and direct imaging of the shadow of the black hole.
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