http://arxiv.org/abs/1810.03722
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.
A. Arza
Tue, 7 Apr 20
33/72
Comments: 4 pages, 3 figures
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