Stationary, asymptotically flat, black hole solutions of the vacuum field equations of general relativity belong to the Kerr family. But how does one approach this state, dynamically? Linearized fluctuations decay at late times, at fixed spatial position, as a Price power law for generic initial conditions. However, little attention was paid to forced and nonlinear spacetimes, where matter and nonlinearities play a role. We uncover a new, source-driven tail governing waves generated by pointlike matter and nonlinearities, which can dominate over Price’s decay.

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• General relativity
• Gravitation
• Gravitational waves
• Numerical relativity