Research

One of the great challenges of the present Standard Model of elementary particle physics is the origin of neutrino masses. Our research group is systematically investigating how the mechanism of neutrino mass generation can be probed best at future experiments, in particular at possible future  e^- e⁺, pp and e^-p colliders such as the ILC, FCC-ee, CLIC, CEPC, HL-LHC, FCC-hh/SppC, LHeC and the FCC-eh. Furthermore, we are exploring the predictions for the light neutrino masses and leptonic mixing angles and CP phases from Grand Unified Theories.

Towards the challenge of identifying a more fundamental theory behind the current Standard Model of elementary particle physics, one goal of our group is the development of predictive Grand Unified Theory (GUT) models, as well as the development of tools for their precision analysis. In this context, we are focusing on gravitational wave signatures of topological defects from GUT phase transitions as well as on GUT predictions for proton decay rates and for the masses of the supersymmetric partner particles in the context of supersymmetric GUTs. 

When constructing theoretical models for the early universe, one of the challenges is linking the phase of cosmic inflation to the later phase of the universe where, e.g., the matter-antimatter asymmetry and the dark matter are produced. In addition to developing new models for the early universe in the framework of GUTs, we contribute to clarifying this link by calculating the intermediate "reheating phase", including the production of gravitational waves and non-perturbative phenomena like "oscillons", after particle physics motivated classes of inflation models.