  A hidden sector with pure non-abelian gauge symmetry is an elegant and just
about the simplest model of dark matter. In this model the dark matter
candidate is the lightest bound state made of the confined gauge fields, the
dark glueball. In spite of its simplicity, the model has been shown to have
several interesting non-standard implications in cosmology. In this work, we
explore the gravitational waves from binary boson stars made of
self-gravitating dark glueball fields as a natural and important consequence.
We derive the dark SU($N$) star mass and radius as functions of the only two
fundamental parameters in the model, the glueball mass $m$ and the number of
colors $N$, and identify the regions that could be probed by the LIGO and
future gravitational wave observatories.
