Black hole energy extraction via stationary scalar clouds
arXiv:1509.06681 · doi:10.1103/PhysRevD.93.044043
Abstract
We study scalar field configurations around Kerr black holes with a time-independent energy-momentum tensor. These stationary `scalar clouds', confined near the black hole (BH) by their own mass or a mirror at fixed radius, exist at the threshold for energy extraction via superradiance. Motivated by the electromagnetic Blandford-Znajek (BZ) mechanism, we explore whether scalar clouds could serve as a proxy for the force-free magnetosphere in the BZ process. We find that a stationary energy-extracting scalar cloud solution exists when the reflecting mirror is replaced by a semi-permeable surface which allows the cloud to radiate some energy to infinity while maintaining self-sustained superradiance. The radial energy flux displays the same behaviour for rapidly rotating holes as magnetohydrodynamic simulations predict for the BZ mechanism.
7 pages, 1 figure
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- Skyrmions around Kerr black holes and spinning BHs with Skyrme hair
- Stationary bound-state scalar configurations supported by rapidly-spinning exotic compact objects
- Stationary Scalar Clouds Around Maximally Rotating Linear Dilaton Black Holes
- Synchronized stationary clouds in a static fluid
- Scalar Clouds and Quasinormal Modes
- Alfvénic superradiance for a monopole magnetosphere around a Kerr black hole