Detecting Dark Blobs
  Current dark matter detection strategies are based on the assumption that the
dark matter is a gas of non-interacting particles with a reasonably large
number density. This picture is dramatically altered if there are significant
self interactions within the dark sector, potentially resulting in the
coalescence of dark matter particles into large composite blobs. The low number
density of these blobs necessitates new detector strategies. We study
cosmological, astrophysical and direct detection bounds on this scenario and
identify experimentally accessible parameter space. The enhanced interaction
between large composite states and the standard model allows searches for such
composite blobs using existing experimental techniques. This includes the
detection of scintillation in MACRO, XENON and LUX, heat in calorimeters such
as CDMS, acceleration and strain in gravitational wave detectors such as LIGO
and AGIS, and spin precession in CASPEr. These searches leverage the fact that
the transit of the dark matter occurs at a speed ~220 km/s, well separated from
relativistic and terrestrial sources of noise. They can be searched for either
through modifications to the data analysis protocol or relatively
straightforward adjustments to the operating conditions of these experiments.
