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Quantum-corrected ultraextremal horizons and the validity of the WKB approximation in the massless limit
We consider quantum backreaction of the quantized scalar field with an arbitrary mass and curvature coupling on ultraextremal horizons. The problem is distinguished in that (in contrast to nonextremal or extremal black holes) the WKB approximation remains valid near ${r}_{+}$ (which is the radius of the horizon) even in the …