Axion Dark Matter Echos from Ancient Supernova Remnants

Chen Sun
Tel Aviv University
Wednesday, December 1, 2021
11:00 am
Zoom Seminar


Stimulated decays of axion dark matter, triggered by a source in the sky, could produce a photon flux along the continuation of the line of sight, pointing backward to the source. The strength of this so-called axion “echo” signal depends on the entire history of the source and could still be strong from sources that are dim today but had a large flux density in the past, such as supernova remnants (SNRs). This echo signal turns out to be most observable in the radio band. In this talk, I will discuss the sensitivity of radio telescopes such as the Square Kilometer Array (SKA) to echo signals generated by SNRs that have already been observed. I will also show projections of detection reach for signals from old “ghost” SNRs which were very bright in the past but are so dim that they haven’t been observed now.

Yuri Shirman