Update on scalar singlet dark matter
  One of the simplest models of dark matter is that where a scalar singlet
field S comprises some or all of the dark matter, and interacts with the
standard model through an HHSS coupling to the Higgs boson. We update the
present limits on the model from LHC searches for invisible Higgs decays, the
thermal relic density of S, and dark matter searches via indirect and direct
detection. We point out that the currently allowed parameter space is on the
verge of being significantly reduced with the next generation of experiments.
We discuss the impact of such constraints on possible applications of scalar
singlet dark matter, including a strong electroweak phase transition, and the
question of vacuum stability of the Higgs potential at high scales.
