Radiation and energy release in a background field of axion-like dark matter

We study possible electromagnetic radiation caused by the φF̃F interaction in an oscillating axion-like background field and a large scale magnetic field in galaxy. We find that a fuzzy dark matter background and the mG scale magnetic field in the galactic center can give rise to a quite strong radiation and a very large energy release. We also show that there is an energy transfer between the fuzzy dark matter sector and the electromagnetic sector because of the presence of the generated radiation field and the galactic magnetic field. Contrary to the common idea that signatures of ultra-light fuzzy dark matter are very rare and fuzzy dark matter is hard to detect, we have shown using the example of the possible radiation that the fuzzy dark matter together with a large scale magnetic field is possible to give rise to fruitful physics.