Resonant $\gamma \to a$ transition in magnetar magnitosphere

TL;DR

This paper investigates how a magnetized plasma in magnetar magnetospheres affects the resonant production of axions, concluding that this mechanism is inefficient for generating cold dark matter.

Contribution

It introduces a detailed analysis of resonant photon-to-axion transitions in magnetar environments and quantifies axion production from cosmic microwave background interactions.

Findings

Resonant axion emissivity is linked to photon-to-axion transition emissivity.

Calculated axion production from CMB in magnetar magnetospheres is negligible.

The mechanism is ineffective for cold dark matter generation.

Abstract

The effect of a magnetized plasma on the resonant photoproduction of axions on the electromagnetic multipole components of the medium, $i \to f+a$, has been considered. It has been shown that the axion resonant emissivity, due to various reactions involving particles of the medium, is naturally expressed in terms of the emissivity of the photon $\to$ axion transition. The number of axions produced by the equilibrium cosmic microwave background radiation in the magnetar magnetosphere has been calculated. It has been shown that the resonant mechanism under consideration is inefficient for the production of cold dark mass.