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btz black hole 1cosmology 1dirichlet boundary conditions 1finite-time singularities 1higher-dimensional gravity 1trapped surfaces 1

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gr-qc2026

Living on the Edge of Effective Field Theory: Near-Extremal Black Holes in Quadratic Gravity

Kelvin Ka-Ho Lam, Gary T. Horowitz, Nicolás Yunes

Near-extremal black holes can amplify higher-derivative corrections to general relativity, making them sharp probes of the perturbative control of gravitational effective field the…