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Publisher’s Note: Black-hole bomb and superradiant instabilities [Phys. Rev. D<b>70</b>, 044039 (2004)]
A wave impinging on a Kerr black hole can be amplified as it scatters off the hole if certain conditions are satisfied giving rise to superradiant scattering. By placing a mirror around the black hole one can make the system unstable. This is the black hole bomb of Press and …