Speaker
Yitian Sun
Description
Axion echoes occur when axions undergo stimulated decay due to background radio fluxes, producing decay photons traveling in nearly the opposite direction of the stimulating rays. In our galaxy, bright radio sources such as supernova remnants and synchrotron radiation can induce echoes from diffuse axion dark matter, which enables various types of radio telescopes to search in competitive axion parameter space by looking for the echo image of both point-like and extended sources.
In this talk, I will explain the geometry of axion echoes and the observation strategies we employ to probe axion dark matter. I will also discuss recent work on observing echoes of solar radio emissions from axion stars.
Authors
Yitian Sun
Huangyu Xiao
(Fermilab)
Jae Hyeok Chang
(Fermilab)
Katelin Schutz
(McGill U)