Extremal / Near-Extremal

Nonlinear codimension-1 stability of extremal Kerr with horizon hair

Full linear theory for extremal Kerr (spin 2)

Nonlinear fate of Aretakis instability

Uniform estimates in the surface-gravity limit κ→0

Rigorous near-horizon scattering theory for NHEK

Extremal interior SCC and Cauchy-horizon regularity

Extremal tail asymptotics versus conserved charges

Near-extremal QNM accumulation and branch-cut structure

Codimension and modulation theory for extremal endstates