https://anilzen.github.io/publication/2012-zenginoglu-caustic-echoes/
Caustic echoes from a Schwarzschild black hole | Anıl Zenginoğlu
Sep 14, 2026 - Animations on YouTube for [nonrotating](https://www.youtube.com/watch?v=Pe8sRjqtldQ) and [rotating](https://www.youtube.com/watch?v=iEA31IL1mFI) cases....
schwarzschild black holecausticechoes
https://khazna.ku.ac.ae/en/publications/the-problem-of-embedded-eigenvalues-for-the-dirac-equation-in-the/fingerprints/
The problem of embedded eigenvalues for the Dirac equation in the Schwarzschild black hole metric -...
schwarzschild black holethe problemdirac equationembeddedeigenvalues