Our theoretical cosmology group explores effects of general relativity, which we study by making synthetic observations in cosmological models. The overall aim of our research is to learn how effects of general relativity and structures, from individual particles to large-scale structures of the Universe, impact astronomical/cosmological observations.
Besides considering traditional observables such as redshift-distance relations, we are focused on real-time cosmology with redshift drift being a prime example, as well as on cosmographic expansions based on general spacetimes. Although the work requires analytical calculations and derivations, much of our work is based on programming.
We use a variety of different types of models, some being exact solutions to Einstein's field equations and others being simpler toy-models. We also use simulations such as gevolution and Gadget as well as simulations made with the Einstein Toolkit.