Constraining dark matter annihilation with the isotropic $\gamma$-ray background: updated limits and future potential

Torsten Bringmann, Francesca Calore, Mattia Di Mauro +1

The nature of the Isotropic $\gamma$-ray Background (IGRB) measured by the Large Area Telescope (LAT) on the Fermi $\gamma$-ray space Telescope ({\it Fermi}) remains partially unexplained. N…