The AdS Perspective on the Nonlinear Tails in Black Hole Ringdown

Black holes gradually settle into their static configuration by emitting gravitational waves, whose amplitude diminish over time according to a power-law decay at fixed spatial locations. We show that the nonlinear tails in the presence of a quadratic source, which have been recently found to potentially dominate over the linear ones, can be simply derived from the AdS${}_2$$\times$S${}^2$ spacetime perspective with their amplitudes being related to the Aretakis constants.