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Antonio Condorelli - Particle Propagation and the Multi-Messenger View of the Highest-Energy Particles in Nature
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Europe/Berlin
Description
In the era of multi-messenger astrophysics, understanding the propagation of ultra-high-energy particles through cosmic environments is key to connecting observations across messengers. Ultra-high-energy cosmic rays (UHECRs), as well as the secondary neutrinos and gamma rays generated during their propagation, provide complementary windows into the most energetic astrophysical processes. This contribution will review recent advances in modeling and observation of UHECR propagation, including energy losses, magnetic deflections, and nuclear disintegration in extragalactic space. We will discuss how the resulting spectral features, mass composition, and anisotropy patterns constrain the nature and distribution of both steady and transient cosmic accelerators. Particular attention will be given to the production of cosmogenic neutrinos and their detectability with current and upcoming observatories. In this context, we will highlight the recent ultra-high-energy event reported by KM3NeT and explore its implications for particle propagation models and source scenarios within the multi-messenger framework.
In parallel, accurate modeling of particle propagation within detectors is essential for interpreting multi-messenger signals, ensuring robust reconstruction of energies, arrival directions, and particle identification.
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