Black Hole Superradiance in Dynamical Chern-Simons Gravity
Abstract
Black hole superradiance provides a window into the dynamics of light scalar fields and their interactions close to a rotating black hole. Due to the rotation of the black hole, the amplitude of the scalar field becomes magnified, leading to a "black hole bomb" effect. Recent work has demonstrated that rotating black holes in dynamical Chern-Simons gravity possess unique structures, the "Chern-Simons caps," which may influence the behavior of matter near the black hole. Motivated by the presence of these caps, we study superradiance in dynamical Chern-Simons gravity in the context of a slowly rotating black hole. We find that additional modes are excited and contribute to the superradiance beyond what is expected for a Kerr black hole. Studying the superradiant spectrum of perturbations, we find that the Chern-Simons contributions give rise to small corrections to the angular dependence of the resulting scalar cloud. Finally, we comment on potential observable consequences and future avenues for investigation.
Cite
@article{arxiv.2201.02220,
title = {Black Hole Superradiance in Dynamical Chern-Simons Gravity},
author = {Stephon Alexander and Gregory Gabadadze and Leah Jenks and Nicolás Yunes},
journal= {arXiv preprint arXiv:2201.02220},
year = {2023}
}
Comments
Error in Eq. 51-53 and 69-71 corrected, updated discussion