Constraints on mediator-based dark matter and scalar dark energy models using sqrt(s) = 13 TeV pp collision data collected by the ATLAS detector

Constraints on selected mediator-based dark matter models and a scalar dark energy model using up to 37 fb-1 sqrt(s) = 13TeV 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 nal states are interpreted in terms of a set of spin-1 and spin-0 single-mediator dark matter simplied 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 ps = 8TeV 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).