Overview
- The study by Asher Berlin, Joshua Foster, Dan Hooper, and Gordan Krnjaic, published Thursday, April 9 in the Journal of Cosmology and Astroparticle Physics, proposes two kinds of dark matter particles.
- In this model, gamma rays appear when the two types meet, so the local mix of particles sets the annihilation rate.
- The idea aims to match Fermi data that show a gamma-ray glow near the Milky Way and no comparable signal in dwarf galaxies.
- The authors say dwarf-galaxy data are limited and they call for deeper Fermi observations to test the model against pulsar-based explanations.
- Scientists still have not seen dark matter directly, and they infer it from how gravity moves stars and gas.