I am a particle cosmologist and as such interested in the interplay of particle physics and cosmology in the early Universe.

The premise of my research is to regard the early Universe as a unique particle physics laboratory that enables us to study the laws of nature at energies far beyond the reach of terrestrial experiments. I strive to describe the physical processes in this laboratory and thus advance our understanding of (A) the first fractions of a second in the history of our Universe and (B) particle physics at extremely high energies. I am particulary interested in models of "new physics" and the opportunities they offer to address the various shortcomings of the two standard models of particle physics and cosmology.

In the past, I therefore extensively worked on inflation, leptogenesis, and neutrinos, both from a phenomenological and a model-building perspective.

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More recently, I additionally started working on cosmological axion models and gravitational waves from primordial sources such as cosmic strings and cosmological phase transitions. This path also led me to join the NANOGrav pulsar timing array (PTA) collaboration in 2021, where I am currently coordinating various efforts to search for exotic gravitational-wave signals in the most recent PTA datasets.