Research is centered on the study of sources of gravitational radiation as well as other relativistic phenomena in astrophysics. A large part is devoted to the computation of oscillation frequencies of relativistic stars and black holes. The results are expected to be used in the extraction of physical characteristics of gravitational wave sources, after successful detection by the new generation of gravitational wave detectors that are now operating in several countries. In the study of sources of gravitational waves, we also use three-dimensional nonlinear simulations that are carried out on large super-computers. A recent result of this approach is the discovery of a new way to form supermassive black holes.
Relativistic Cosmology is one of the most active areas in the theoretical study of the universe. The goal of this research effort is to interpret the structure of the universe that we observe today and to give answers to questions related to its future evolution. The theoretical approach is achieved mainly through the study of cosmological solutions of the theory of general relativity and their perturbations. The research group in relativistic cosmology of the Aristotle University of Thessaloniki is actively participating in this effort.