  Axion-like-particles are a well-motivated extension of the Standard Model
that can mediate interactions between the dark matter and ordinary matter. Here
we consider an axion portal between the two sectors, where the axion couples to
dark matter and to QCD gluons. We establish the relevant processes of interest
across the scales of dark matter and axion masses and couplings, identify the
distinct mechanisms that control the dark matter relic abundance in each case,
and extract the resulting experimental signatures of the gluonic axion portal
to dark matter.
