Black hole lensing in Kerr-de Sitter spacetimes

Understand

We have derived analytical solutions using Jacobi elliptic functions for bound and nearly bound photon orbits in Kerr-de Sitter (KdS) and Kerr-de Sitter Revisited (RKdS) spacetimes.

• Leveraging our obtained solutions, we have conducted an analytic ray-tracing in both spacetimes.
• We have obtained direct images, lensing rings and photon rings for equatorial disks considering inclined locally static observers.
• Images corresponding to n=(2,3) exhibit a significantly closer resemblance to the critical curve as compared to the n=1 image.