Hairless Black Hole by Superradiance
Sebastian Garcia-Saenz, Guangzhou Guo, Peng Wang, Xinmiao Wang

TL;DR
This paper studies how scalarization and superradiance interact around charged black holes, finding that superradiance prevents scalar hair formation and leads to efficient energy extraction from the black hole.
Contribution
It introduces the concept of tachyonic superradiance, combining scalarization and superradiance effects, and provides formulas for energy fluxes in dynamical black hole spacetimes.
Findings
Superradiance depletes scalar condensate via accretion and radiation.
Scalarization is suppressed in the presence of superradiance.
Derived energy flux formulas applicable to numerical relativity.
Abstract
We investigate the interplaying effects of black hole scalarization and superradiance in the context of the Einstein-Maxwell-scalar model, with the scalar field possessing electric charge. Restricted to spherical symmetry, our linear analysis about a Reissner-Nordstr\"om background confirms the persistence of tachyonic scalar modes upon inclusion of electric charge. However, fully nonlinear numerical simulations reveal that the system no longer evolves into a scalarized, hairy black hole state. Instead, we find that the superradiance phenomenon (specifically the electromagnetic version of the effect) causes the scalar condensate to become fully depleted through accretion into the black hole and radiation to spatial infinity. The combination of the two effects, which we refer to as "tachyonic superradiance", may thus be seen as a particularly efficient mechanism for the extraction of…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
