Our research focusses on problems at the interface between Quantum Theory—the theory of matter—and General Relativity—the theory of gravity. These two theories form the main pillars of modern fundamental physics, tough they partially rest on mutually incompatible principles. We wish to gain a better understanding as to how these principles have to be modified in order to achieve unification by asking simple questions regarding experimentally accessible situations to which both theories apply. We are also interested in mathematical aspects of Special and General Relativity, which brings us in close contact to  the research group Gravitational Theory.