2 papers
gr-qc2026
Time delay as a probe of multiple photon spheres
Kajol Paithankar, Sanved Kolekar
Black hole shadow images are primarily determined by the properties of photon spheres and can exhibit degeneracies across different spherically symmetric spacetime geometries. We s…
gr-qc2025
Photon region boundary for stationary axisymmetric black holes
Prasad Padhye, Kajol Paithankar, Sanved Kolekar
The black hole shadow is fundamentally connected to the structure of light rings and the photon region in the background geometry. We investigate the photon region boundary in a ge…