Indirect Detection of Composite (Asymmetric) Dark Matter
  Dark Matter can form bound states upon the emission of quanta of energy equal
to the binding energy. The rate of this process is large for
strongly-interacting Dark Matter, and further enhanced by long distance
effects. The resulting monochromatic and diffuse $\gamma$-rays can be tested in
indirect detection experiments. If Dark Matter has electroweak charge, indirect
signals include multiple observable photon lines for masses in the TeV range.
Else if it couples only via a dark photon portal, diffuse spectra from dwarf
galaxies and CMB reionization set powerful limits for masses below a TeV. This
mechanism provides a powerful means of probing Asymmetric Dark Matter today.
