European Physical Journal C: Particles and Fields (Mar 2019)

Photon enhancement in a homogeneous axion dark matter background

  • Ariel Arza

DOI
https://doi.org/10.1140/epjc/s10052-019-6759-7
Journal volume & issue
Vol. 79, no. 3
pp. 1 – 5

Abstract

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Abstract We study the propagation of photons in a homogeneous axion dark matter background. When the axion decay into two photons is stimulated, the photon field exhibits a parametric instability in a small bandwidth centered on one half of the axion mass. We estimate analytically the enhancement for both coherent and non-coherent axion fields and we find that this effect could be relevant in the context of miniclusters and galactic halos.