Fermi Gamma-ray Space Telescope

Constraining A Complex Dark Sector With Fermi

N. Rodd
T. Slatyer, G. Elor, W. Xue, T. Linden, B. Safdi

Abstract:

Indirect searches for dark matter annihilation often parameterise their signal by a small number of annihilation channels, where dark matter annihilates to a pair of Standard Model particles. However, a broader range of signals can be obtained if the annihilation is to e.g. multiparticle final states, and/or to intermediate ?dark sector? particles which subsequently undergo a decay cascade with Standard Model products. I will present a general framework for such scenarios and outline the implications for dark matter constraints from Fermi observations of dwarf galaxies; I will also briefly discuss bounds from AMS-02 and the CMB. I will comment on the relevance of this framework to a dark matter interpretation of excess ~GeV gamma-ray emission in the Galactic Centre, and discuss the present uncertainty as to whether higher-energy residual emission in the same region shares a physical origin with the ~GeV excess.