Magneto-electro-statics of axionically active systems: Induced field restructuring in magnetic stars

TL;DR

This paper investigates how axion-photon interactions in magnetic stars lead to complex field restructuring, including halo distortion, multipole magnetic field components, and induced electric fields, with potential implications for axionic magnetar models.

Contribution

It presents a novel analysis of axion-electromagnetic interactions in magnetic stars, revealing how these interactions cause field distortions and multipole structures not previously detailed.

Findings

Axionic halo becomes non-spheroidal due to magnetic field distortion.

Magnetic field develops higher multipole components beyond dipole.

Electric field inherits multipole structure from axion-photon interactions.

Abstract

In the framework of Einstein-Maxwell-axion theory we consider a static field configuration in the outer zone of a magnetic star. We assume that this field configuration is formed by the following interacting quartet: a spherically symmetric gravitational field of the Reissner-Nordstr\"om type, pseudoscalar field, associated with an axionic dark matter, strong intrinsic magnetic field, and axionically induced electric field. Based on the analysis of the solutions to the master equations of the model, we show that the structure of the formed field configuration reveals the following triple effect. First, if the strong magnetic field of the star has the dipole component, the axionic halo around the magnetic star with spherically symmetric gravitational field is no longer spheroidal, and the distortion is induced by the axion-photon coupling; second, due to the distortion of the axionic halo the magnetic field is no longer pure dipolar, and the induced quadruple, octupole, etc., components appear thus redistributing the magnetic energy between the components with more steep radial profiles than the dipolar one; third, the interaction of the axionic and magnetic fields produces the electric field, which inherits their multipole structure. We attract attention to possible applications of the predicted field restructuring to the theory of axionic rotating magnetars.