Electroweak-Symmetric Dark Monopoles from Preheating
  If the dark sector contains 't Hooft-Polyakov monopoles and a small enough
dark gauge coupling, dark monopoles could be a macroscopic dark matter
candidate. Its Higgs-portal coupling to the Standard Model can modify the
electroweak vacuum in the monopole interior. In the most striking cases, dark
monopoles could even contain electroweak-symmetric cores and generate multi-hit
signals at large-volume detectors. If they are produced via parametric
resonance in the early Universe, monopoles with radii up to one micron and
masses up to ten kilotonnes could account for all of dark matter.
