  Constraints on selected mediator-based dark matter models and a scalar dark
energy model using up to $37~\mathrm{fb}^{-1}$ $\sqrt s = 13$ TeV $pp$
collision data collected by the ATLAS detector at the LHC during 2015-2016 are
summarised in this paper. The results of experimental searches in a variety of
final states are interpreted in terms of a set of spin-1 and spin-0
single-mediator dark matter simplified models and a second set of models
involving an extended Higgs sector plus an additional vector or pseudo-scalar
mediator. The searches considered in this paper constrain spin-1 leptophobic
and leptophilic mediators, spin-0 colour-neutral and colour-charged mediators
and vector or pseudo-scalar mediators embedded in extended Higgs sector models.
In this case, also $\sqrt s = 8$ TeV $pp$ collision data are used for the
interpretation of the results. The results are also interpreted for the first
time in terms of light scalar particles that could contribute to the
accelerating expansion of the universe (dark energy).
