Directly detecting Isospin-Violating Dark Matter
  We consider the prospects for multiple dark matter direct detection
experiments to determine if the interactions of a dark matter candidate are
isospin-violating. We focus on theoretically well-motivated examples of
isospin-violating dark matter (IVDM), including models in which dark matter
interactions with nuclei are mediated by a dark photon, a Z, or a squark. We
determine that the best prospects for distinguishing IVDM from the
isospin-invariant scenario arise in the cases of dark photon- or Z-mediated
interactions, and that the ideal experimental scenario would consist of large
exposure xenon- and neon-based detectors. If such models just evade current
direct detection limits, then one could distinguish such models from the
standard isospin-invariant case with two detectors with of order 100 ton-year
exposure.
