  The Inert Doublet Model relies on a discrete symmetry to prevent couplings of
the new scalars to Standard Model fermions. This stabilizes the lightest inert
state, which can then contribute to the observed dark matter density. In the
presence of additional approximate symmetries, the resulting spectrum of exotic
scalars can be compressed. Here, we study the phenomenological and cosmological
implications of this scenario. We derive new limits on the compressed Inert
Doublet Model from LEP, and outline the prospects for exclusion and discovery
of this model at dark matter experiments, the LHC, and future colliders.
