Kerr black holes with synchronised axionic hair

2020/12/07 by Jorge F. M. Delgado, Carlos A. R. Herdeiro, Eugen Radu · 1 citation
Physics and Astronomy · #gr-qc #hep-th

paper · pdf · doi:10.1103/physrevd.103.104029

published as Phys. Rev. D 103, 104029 (2021) · 15 pages, 7 figures

arxiv created 2020/12/07 · arxiv updated 2021/05/19

Abstract

We construct and analyse Kerr black holes (BHs) with synchronised axionic hair. These are the BH generalisations of the recently constructed rotating axion boson stars arXiv:2005.05982. Such BHs are stationary, axially symmetric, asymptotically flat solutions of the complex Einstein-Klein-Gordon theory with a QCD axion-like potential. They are regular everywhere on and outside the event horizon. The potential is characterised by two parameters: the mass of the axion-like particle, m_a and the decay constant f_a. The limit f_a → ∞ recovers the original example of Kerr BHs with synchronised scalar hair arXiv:1403.2757. The effects of the non-linearities in the potential become important for f_a \lesssim 1. We present an overview of the parameter space of the solutions together with a study of their basic geometric and phenomenological properties, for an illustrative value of the coupling that yields a non-negligible impact of the self-interactions.

Citations

• Rotating Axion Boson Stars
• Kerr black holes with scalar hair

Cited by

• Spinning Black Holes with Scalar Hair and Horizonless Compact Objects within and beyond General Relativity