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Sudden breakdown of effective field theory near cool Kerr-Newman black holes
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It was recently shown that (near-)extremal Kerr black holes are sensitive probes of small higher-derivative corrections to general relativity. In particular, these corrections produce diverging tidal forces on the horizon in the extremal limit. We show that adding a black hole charge makes this effect qualitatively stronger. Higher-derivative corrections to the Kerr-Newman solution produce tidal forces that scale inversely in the black hole temperature. We find that, unlike the Kerr case, for realistic values of the black hole charge large tidal forces can arise before quantum corrections due to the Schwarzian mode become important, so that the near-horizon behavior of the black hole is dictated by higher-derivative terms in the effective theory.
Forward citations
Cited by 4 Pith papers
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Asymptotically safe quantum gravity predicts a positive Goroff-Sagnotti Wilson coefficient at the Planck scale, which would keep extremal Kerr black hole tidal forces finite, but the paper's bound on the quantum gravi...
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Stochastic Evolution of Primordial Black Holes to near-extremality in EFTs of Gravity
In EFT-modified gravity, about the same fraction of primordial black holes (24.6–24.9%) spin up to near-extremality as in GR (~24.7%), and those survivors carry ~10x enhanced near-horizon tidal forces.
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