Speaker
Prof.
Katelin Schutz
Description
In the presence of radiation from bright astrophysical sources at radio frequencies, axion dark matter can undergo stimulated decay to two nearly back-to-back photons, meaning that bright sources could have a counterimage (''gegenschein'') in nearly the exact opposite spatial direction if axions comprise the dark matter. The counterimage will be spectrally distinct from backgrounds, taking the form of a narrow radio line centered at half the axion mass with a width determined by Doppler broadening in the halo. I will discuss how the axion decay-induced echoes of supernova remnants may be bright enough to be detectable with ongoing observations from the FAST radio telescope.
Author
Prof.
Katelin Schutz
