In the Dark About Dark Matter

For years the paradigm of with Weakly-Interacting Massive Particle (WIMP) has dominated the theoretical and experimental study of dark matter.  But despite a large variety of searches, no unambiguous signals for WIMPs have been found.  Now more than ever, workers in the field are taking a broader view, and shifting their focus to other options.  I will describe the current state of affairs for WIMPs, and consider one particular new option... sub-GeV dark matter.  I will focus in particular on the indirect detection of MeV-range dark matter using gamma rays, for two reasons. Firstly, the astrophysics community is developing new instruments which will dramatically increase sensitivity in this energy range.  Secondly, the gamma-ray spectrum can contain striking features, which are determined by kinematics and symmetry properties.