A review on analytical studies in Gravitational Lensing

Understand

In this study, we review some current studies on Gravitational Lensing for black holes, mainly in the context of general relativity.

• We mainly focus on the analytical studies related to lensing with references to observational results.
• We start with reviewing lensing in spherically symmetric Schwarzschild spacetime, showing how to calculate deflection angles before moving to the rotating counterpart, the Kerr metric.
• Furthermore, we extend our studies for a particular class of newly proposed solutions called black-bounce spacetimes and discuss throughout the review how to explore lensing in these spacetimes and how the various parameters can be constrained using available astrophysical and cosmological data.