Coupled rotation and magnetic fields produce horizon-evanescent Type-II scalar clouds on Kerr-Bertotti-Robinson black holes by rendering the near-horizon wavenumber imaginary below the usual synchronization frequency.
Energy extraction via magnetic reconnection in magnetized black holes
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In a Kerr-Sen-like spacetime from Bumblebee gravity, increasing the Lorentz symmetry breaking rate and Bumblebee charge enlarges the allowed region for energy extraction via magnetic reconnection and moves it closer to the horizon, with peak efficiency when cosmic censorship is marginally violated.
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Horizon-Evanescent Scalar Clouds from Coupled Rotation and Magnetic Fields around Black Holes
Coupled rotation and magnetic fields produce horizon-evanescent Type-II scalar clouds on Kerr-Bertotti-Robinson black holes by rendering the near-horizon wavenumber imaginary below the usual synchronization frequency.
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Energy extraction from a rotating black hole via magnetic reconnection: Bumblebee gravity
In a Kerr-Sen-like spacetime from Bumblebee gravity, increasing the Lorentz symmetry breaking rate and Bumblebee charge enlarges the allowed region for energy extraction via magnetic reconnection and moves it closer to the horizon, with peak efficiency when cosmic censorship is marginally violated.
- Magnetic reconnection in five-dimensional Kerr black hole