Probing Dark Matter with MeV Galactic Observations

Abstract: In this talk, I will present recent work using MeV Galactic observations to search for dark matter.  First, I will show how the 511 keV gamma-ray line, can be used to probe sub-GeV dark matter annihilation or decay, accounting for positron propagation to constrain dark matter properties. Next, I will turn to the Central Molecular Zone (CMZ), where the gas ionisation rate is anomalously high, and demonstrate its power to independently probe sub-GeV dark matter. By modelling the ionisation rate and comparing it with observational data, a possible dark matter explanation will be discussed.  Finally I will discuss Excited Dark Matter as a possible solution to several outstanding MeV sky excesses. A brief overview for future experimental prospects will also be covered.

Zoom link is: https://uni-sydney.zoom.us/j/2980559069?pwd=irjWSRVb2LejlP1MBbomM2E42uWXz8.1. If prompted for a passcode, use “CPPC”