Xenophobic Dark Matter
  We consider models of xenophobic dark matter, in which isospin-violating dark
matter-nucleon interactions significantly degrade the response of xenon direct
detection experiments. For models of near-maximal xenophobia, with
neutron-to-proton coupling ratio $f_n / f_p \approx -0.64$, and dark matter
mass near 8 GeV, the regions of interest for CoGeNT and CDMS-Si and the region
of interest identified by Collar and Fields in CDMS-Ge data can be brought into
agreement. This model may be tested in future direct, indirect, and collider
searches. Interestingly, because the natural isotope abundance of xenon implies
that xenophobia has its limits, we find that this xenophobic model may be
probed in the near future by xenon experiments. Near-future data from the LHC
and Fermi-LAT may also provide interesting alternative probes of xenophobic
dark matter.
