Getting a THUMP from a WIMP
  Producing an acceptable thermal relic abundance of dark matter with masses
$\gg 10^2$ TeV is a challenge. We propose a novel mechanism where GeV-scale
states establish a tiny thermal relic abundance for dark matter, which is later
promoted to ultra massive status by a very light scalar. We refer to this dark
matter as a THermal Ultra Massive Particle (THUMP). Direct detection of THUMPs
can be naturally expected due to large scattering cross sections mediated by
low mass states that couple THUMPs to the Standard Model. Our model generically
leads to signals for the associated GeV-scale states at accelerator
experiments.
