Blandford-Znajek Process in Quadratic Gravity
Abstract
The Blandford-Znajek process, which uses a magnetized plasma to extract energy from a rotating black hole, is one of the leading candidates for powering relativistic jets. In this work, we investigate the Blandford-Znajek process in two well-motivated quadratic gravity theories: scalar Gauss-Bonnet and dynamical Chern-Simons gravity. We solve analytically for a split-monopole magnetosphere to first order in the small-coupling approximation and second relative order in the slow-rotation approximation. The extracted power at fixed spin and magnetic flux is enhanced in scalar Gauss-Bonnet and reduced in dynamical Chern-Simons gravity, compared to general relativity. We find that there is a degeneracy between spin and the coupling constants of the theories at leading order in the slow rotation approximation that is broken at higher orders.
Cite
@article{arxiv.2111.08758,
title = {Blandford-Znajek Process in Quadratic Gravity},
author = {Jameson Dong and Nicolás Patiño and Yiqi Xie and Alejandro Cárdenas-Avendaño and Charles F. Gammie and Nicolás Yunes},
journal= {arXiv preprint arXiv:2111.08758},
year = {2022}
}
Comments
19 pages, 1 figure V2: updated to match the published version