Speaker
Pereñíguez Rodríguez, David
Description
At high frequencies, the dynamics of black holes can be captured by Penrose-limit plane waves adapted to the photon ring. Using that, I will show that gravitational electric–magnetic duality is restored on-shell in that limit, and that this implies QNM isospectrality. I will also show how this perspective on the high-frequency regime can be used to compute exactly nonlinear QNM solutions. I will conclude by discussing consequences for EFT extensions of GR.