Electromagnetic energy transfer processes in Effective Electro-Magneto Dynamics of axions

TL;DR

This paper investigates the energy exchange between electromagnetic fields and axions within an effective dynamical model, providing analytical formulas and exploring implications for axion configurations and their evolution.

Contribution

It introduces an exact formula for energy transfer in an effective electro-magneto dynamical model involving axions and magnetic charges, with analytical solutions for specific configurations.

Findings

Analytical expressions for oscillating electric and magnetic fields in combined magnetic and axion condensate.

Computed electromagnetic energy loss in gravitationally bound axion configurations.

Found a temporal growth law (~ t^{1/5}) for axion clump size evolution.

Abstract

Oscillating and dissipative energy exchange between the electromagnetic and axion fields is investigated in an effective electro-magneto dynamical (EEMD) model theory, implying the coexistence of axions with hypothetic magnetic charges. An exact formula is presented for the energy transfer between the electromagnetic and axionic sectors. In a first example we compute analytically the homogeneously oscillating electric and magnetic field configurations generated by the combined action of a constant static magnetic field and a periodically oscillating axion condensate. In the second example the electromagnetic radiative energy loss of a gravitationally bound axion configuration is computed in the EEMD model. As a result an asymptotic $\sim t^{1/5}$ temporal increase of the clump size is found also in EEMD.