NBIA Seminar: Xavier Rodrigues

In a new era of multi-messenger observatories, numerical models can help shed light on what are the sources of the astrophysical neutrinos and the ultra-high-energy cosmic rays. In this talk I discuss recent results on active galactic nuclei (AGN) as multi-messenger sources, based on numerical simulations of photonuclear cosmic-ray interactions. Assuming AGN jets can reaccelerate cosmic rays up to the EeV regime, I will show that an AGN population may in fact dominate the observed flux and chemical composition of ultra-high-energy cosmic rays. Under certain conditions, the accompanying neutrino flux may be observable by future EeV neutrino telescopes such as GRAND, while respecting the current IceCube limits at PeV energies.