Günter Sigl

Prof. Dr. Günter Sigl is a full Professor of Theoretical Physics and Managing Director of the Astroparticle Physics Group at the II. Institute for Theoretical Physics, University of Hamburg. He is also a Principal Investigator in the Quantum Universe Cluster, a collaboration between Universität Hamburg and DESY, and serves on the executive board of PIER (Partnership for Innovation, Education and Research). His academic career spans prestigious institutions including CNRS (France), University of Chicago, and Ludwig-Maximilians-Universität München.

Education & Career Path:

• 1984–1990: Diploma in Physics, Ludwig-Maximilians-Universität München
• 1993: Doctorate in Physics (supervisors: Georg Raffelt, Leo Stodolsky), Ludwig-Maximilians-Universität München
• 1993–1996: Feodor Lynen Fellow (Alexander von Humboldt Foundation), University of Chicago
• 1997–1999: Research Scientist, University of Chicago
• 1999–2005: Chargé de Recherche, CNRS (IAP, Paris)
• 2005–2007: Directeur de Recherche, CNRS (APC, Paris)
• Since 2007: Professor, University of Hamburg

Research Focus: The Sigl group tackles fundamental questions at the intersection of particle physics and astrophysics. Their work includes understanding the role of neutrinos in supernovae and the early Universe, deciphering dark matter signatures across radio to gamma-ray bands, and exploring the origin and propagation of cosmic rays up to the highest observed energies (~10²⁰ eV). The group actively contributes to the Pierre Auger Observatory and investigates links between astroparticle physics, gravitational wave astronomy, and collider physics (e.g., LHC).

Key Research Themes:

• Ultra-High-Energy Cosmic Rays: Production mechanisms, propagation in magnetic fields, and multi-messenger signatures.
• Dark Matter: Non-thermal relics, axion-like particles, and indirect detection strategies.
• Neutrino Astrophysics: Supernova dynamics, early Universe cosmology, and beyond-Standard-Model interactions.
• Gravitational Waves: Sources from early Universe phase transitions and astrophysical backgrounds.
• Computational Tools: Development of CRPropa, a public code for cosmic ray and neutrino propagation.

Recent Publication Trends: Since 2021, Prof. Sigl has co-authored 15+ papers focusing on (1) advanced simulations of cosmic ray air showers and their muon content, (2) axion/ALP stars and their gravitational wave signatures, (3) next-generation CRPropa frameworks for multi-messenger astronomy, and (4) kinetic theory applications to neutrino physics. Notable venues include Physical Review D, Astroparticle Physics, and Journal of Cosmology and Astroparticle Physics.

Institutional Leadership & Service:

• 2020–2022: Chair, Department of Physics, University of Hamburg
• 2014–2022: Deputy Spokesperson, Wolfgang Pauli Centre (WPC) for Theoretical Physics
• 2011–2016: Coordinator, Helmholtz Alliance for Astroparticle Physics (HAP) Theory Working Package
• Since 2022: Executive Board Member, PIER (Hamburg/DESY)
• 2005–2009: Coordinator, EU Network N6 (Theoretical Astroparticle Physics)

Laboratory & Collaborations: The Astroparticle Physics Group operates within the II. Institute for Theoretical Physics, leveraging synergies with DESY and the Quantum Universe Cluster. While specific student lists aren’t provided, the group actively mentors graduate researchers and postdocs, as reflected in multi-author publications. The group’s infrastructure includes access to supercomputing resources for Monte Carlo simulations and close ties to observational collaborations like Auger.