The (astro-) physics departments in Bonn and Cologne focus on complementary research areas; together, they span almost the full range of modern physics. They lead three Clusters of Excellence:
Color meets flavor (link: https://www.color-meets-flavor.de/)
Dynaverse (link: https://dynaverse.astro.uni-koeln.de/)
ML4Q (link: https://ml4q.de/)
Both departments are also engaged in ongoing collaborations with international research groups worldwide. Research links and collaborations are established both in nuclear and hadron physics and in condensed matter physics with the Forschungszentrum Jülich and in astronomy/astrophysics with the Max-Planck Institute for Radio Astronomy.
University of Bonn
University of Cologne
In Cologne, research is on astrophysics and cosmology, condensed matter and statistical physics, biophysics, and experimental nuclear physics using an in-house tandem accelerator. One of the particular strengths of Cologne physics is theoretical research in condensed matter and statistical physics.