Spinning black holes with axion hair

Burrage, Clare; Fernandes, Pedro G S; Brito, Richard; Cardoso, Vitor

Abstract

In this work we construct and analyze non-perturbative stationary and axially-symmetric black hole solutions in general relativity coupled to an electromagnetic and an axion field. The axion field is coupled to the electromagnetic field, which leads to hairy solutions in the presence of an electric charge and rotation. We investigate the existence and characteristics of these solutions for different values of the spin, charge and coupling constant. Our analysis shows the presence of violations of the Kerr–Newman bound, solutions with large positive and negative values of the gyromagnetic ratio, and the existence of multiple branches of solutions with distinct properties, demonstrating that black hole uniqueness does not hold in this scenario. The code used in this study is publicly available, providing a valuable tool for further research on this model.

Citation

Burrage, C., Fernandes, P. G. S., Brito, R., & Cardoso, V. (2023). Spinning black holes with axion hair. Classical and Quantum Gravity, 40(20), Article 205021. https://doi.org/10.1088/1361-6382/acf9d6

• Journal Article Type: Article
• Acceptance Date: Sep 14, 2023
• Online Publication Date: Sep 26, 2023
• Publication Date: Oct 19, 2023
• Deposit Date: Oct 3, 2023
• Publicly Available Date: Oct 3, 2023
• Journal: Classical and Quantum Gravity
• Print ISSN: 0264-9381
• Electronic ISSN: 1361-6382
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 40
• Issue: 20
• Article Number: 205021
• DOI: https://doi.org/10.1088/1361-6382/acf9d6
• Keywords: charged, stationary, axion, hair, black hole
• Public URL: https://nottingham-repository.worktribe.com/output/25644875
• Publisher URL: https://iopscience.iop.org/article/10.1088/1361-6382/acf9d6
• Additional Information: Article Title: Spinning black holes with axion hair; Journal Title: Classical and Quantum Gravity; Article Type: paper; Copyright Information: © 2023 The Author(s). Published by IOP Publishing Ltd; Date Received: 2023-06-19; Date Accepted: 2023-09-14; Online publication date: 2023-09-26