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T: Fachverband Teilchenphysik

T 37: Cosmic Rays II

T 37.3: Vortrag

Dienstag, 1. April 2025, 16:45–17:00, VG 3.102

Inferring the Ultra-High-Energy Cosmic Ray Flux Prior to Deflections in the Galactic Magnetic Field Using Information Field Theory — Martin Erdmann, •Frederik Krieger, Josina Schulte, Michael Smolka, and Maximilian Straub — III. Physikalisches Institut A, RWTH Aachen University

Ultra-high-energy cosmic rays (UHECRs) are assumed to be charged nuclei with energies exceeding 10¹⁸ eV, whose origins and acceleration mechanisms are still not discovered. Upon entering the Earth’s atmosphere, UHECRs interact with air molecules, initiating extensive particle showers that can be observed by cosmic ray observatories. However, as UHECRs traverse the Galactic magnetic field (GMF), they are deflected, changing their trajectories and causing the measured arrival directions to no longer point back to their sources. To address this challenge, we present a novel approach combining forward modeling and information field theory to reconstruct the UHECR flux before deflection in the GMF. We apply this method to an astrophysical model, demonstrating its potential to improve the estimation of the UHECR source distribution.

Keywords: Ultra-high-energy cosmic rays; Information field theory; Forward modelling; Galactic magnetic field