Signatures from Scalar Dark Matter with a Vector-like Quark Mediator
  We present a comprehensive study of a model where the dark matter is composed
of a singlet real scalar that couples to the Standard Model predominantly via a
Yukawa interaction with a light quark and a colored vector-like fermion. A
distinctive feature of this scenario is that thermal freeze-out in the early
universe may be driven by annihilation both into gluon pairs at one-loop ($gg$)
and by virtual internal Bremsstrahlung of a gluon ($q \bar{q} g$). Such a dark
matter candidate may also be tested through direct and indirect detection and
at the LHC; viable candidates have either a mass nearly degenerate with that of
the fermionic mediator or a mass above about 2 TeV.
