Radio-emission of axion stars

@article{Levkov2020RadioemissionOA,
  title={Radio-emission of axion stars},
  author={D. G. Levkov and Alexander Panin and Igor Tkachev},
  journal={Physical Review D},
  year={2020},
  volume={102}
}
We study parametric instability of compact axion dark matter structures decaying to radiophotons. Corresponding objects - Bose (axion) stars, their clusters, and clouds of diffuse axions - form abundantly in the postinflationary Peccei-Quinn scenario. We develop general description of parametric resonance incorporating finite-volume effects, backreaction, axion velocities and their (in)coherence. With additional coarse-graining, our formalism reproduces kinetic equation for virialized axions… 

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