Speaker
Alex Kehagias
(Natl. Tech. U. Athens)
Description
Black holes relax toward stationarity through gravitational‐wave ringdown, followed at fixed radius by late–time power-law tails. Recent work suggests that nonlinear tails sourced by quadratic self-couplings can outshine the familiar linear tails. In this talk I present a compact derivation of these nonlinear tails using the near-horizon AdS2×S2 perspective. The method treats the late-time waveform as a response of the AdS2 scalar sector to an effective quadratic source and maps the tail amplitude to horizon data. In particular, I show that the overall normalization of the dominant nonlinear tail is controlled by Aretakis constants, providing a direct link between conserved horizon charges and observable late-time decay.
