Extremal Kerr black holes as amplifiers of new physics
arXiv:2303.07358 · doi:10.1103/PhysRevLett.131.091402
Abstract
We show that extremal Kerr black holes are sensitive probes of new physics. Stringy or quantum corrections to general relativity are expected to generate higher-curvature terms in the gravitational action. We show that in the presence of these terms, asymptotically flat extremal rotating black holes have curvature singularities on their horizon. Furthermore, near-extremal black holes can have large yet finite tidal forces for infalling observers. In addition, we consider five-dimensional extremal charged black holes and show that higher-curvature terms can have a large effect on the horizon geometry.
6 pages (+ 4 pages supplementary material), v2 matches published version, v3 contains an added note about parity-odd terms
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