Research

Blazars, active galactic nuclei whose relativistic jets align with our line of sight, dominate the gamma-ray sky. We simulate their emission to understand jet formation, particle content and their role as cosmic-ray and neutrino factories.

Key publications

• Multi-messenger emission from the parsec-scale jet of PKS 1502+106 — Oikonomou et al. (2021) JCAP

• High-energy neutrino flux from individual blazar flares — Oikonomou et al. (2019) MNRAS

Data from the Pierre Auger Observatory and Telescope Array constrain the density, composition and maximum energies of the still-mysterious ultra-high-energy cosmic-ray accelerators.

Key publications

• The Curious Case of the Maximum Rigidity Distribution of UHECR Accelerators — Ehlert, Oikonomou, Unger (2023)

• Open Questions in Cosmic-Ray Research at Ultra-High Energies — Alves Batista et al. (2019)

• Large-scale anisotropy above 8×1018 eV — Pierre Auger Collaboration (2017) Science

We develop the science case for next-generation facilities such as GRAND, GCOS and NASA’s POEMMA.

Key publication

• The Giant Radio Array for Neutrino Detection (GRAND): Science and design — Alvarez-Muñiz et al. (2020)