Fields of expertise We are pursuing four major research areas: Foundations of quantum gauge-field theory, QCD and the QCD phase diagram, Higgs physics, and physics beyond the standard model. All of them are concerned with the problem of how particles behave, once interactions can no longer be treated as a small effect (perturbation). A description of this research can also be found in our popular science blog. The latest news on our research or from the field can also be found on Twitter.