Generation of ultralight axions by a Kerr black hole. II. The favorable magnetospheric physics

Pelletier, Guy

doi:10.1103/PhysRevD.111.063004

Generation of ultralight axions by a Kerr black hole. II. The favorable magnetospheric physics

Guy Pelletier
(
- IPAG
)

Mar 3, 2025

16 pages

Published in:

Phys.Rev.D 111 (2025) 6, 063004

Published: Mar 3, 2025

DOI:

10.1103/PhysRevD.111.063004 (publication)

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Abstract: (APS)

This work is devoted to the production of axion particles in the vicinity of supermassive Kerr black holes, and this article is the second part of our work presenting the physical processes necessary for the production of axions. The framework is the physics of the magnetosphere in general relativity that contains the Blandford-Znajek mechanism of jet launching supplemented by a version of the Goldreich-Julian charge generation adapted to the magnetosphere of a Kerr black hole, which leads to the formation of “gaps” like in a pulsar magnetosphere. These gaps produced close to the horizon result from the generation of an intense poloidal component of the electric field such that

\vec{E} \cdot \vec{B} \neq 0

, which is necessary for the production of axion particles. These gaps are steady or oscillating and the creation of new axions stems from oscillating gaps, which are described in order to reveal their appropriate characteristics for this purpose. High-energy radiation plays an essential role in determining the parameters of the oscillating gaps and the power of axion emission. With reasonable parameters, it is found that the axion emission in active galactic nuclei and quasars can significantly feed their halos with axion dark matter.

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