Colorado School of Mines, Physics Department
Abstract: Ultra-High-Energy cosmic rays (UHECRs) are the most energetic objects yet observed, and can have individual particle energies of 1020 eV. The field of physics which studies them is called astroparticle physics and it sits at the intersection of high-energy particle physics and multi-messenger astrophysics. The primary goals for this field of study are identifying the astrophysical mechanisms capable of accelerating particles to these extreme energies and leveraging UHECR to probe physics at energies far beyond what human made experiments are capable of producing in the near future. Right now is an exciting time in astroparticle physics as practically all aspects of this field are undergoing a rapid evolution due to the availability of high-quality, high-statistics data-sets, advancing computational techniques, and revolutions in instrumentation design and scale . A particularly exciting development is the advent of new analysis techniques which can map the particle universe at the highest energies using the composition of arriving cosmic rays. With this method, for the first time a composition dependent anisotropy in the UHECR sky has been identified and is approaching discovery status . Furthermore, the anisotropy itself may be a significant driver of our understanding of the highest-energy extra-galactic systems, as its strength far surpasses those predicted with the most current astrophysical models . This talk will give a brief overview of UHECR physics and where it is going over the next 20 years. Special attention is given to the technique of mapping the UHECR sky in terms of primary composition.
 A. Coleman, J. Eser, E. Mayotte, F. Sarazin, F. Schröder, D. Soldin, T. Venters et al., “Ultra-High-Energy Cosmic Rays: The Intersection of the Cosmic and Energy Frontiers,” Astroparticle Physics Special issue 147, 5 2022.
 E. Mayotte et al., “Indication of a mass-dependent anisotropy above 1018.7 eV in the hybrid data of the Pierre Auger Observatory,” PoS, vol. ICRC2021, p. 321, 2021.
 D. Allard, J. Aublin, B. Baret, and E. Parizot, “What can be learnt from UHECR anisotropies observations? Paper I : large-scale anisotropies and composition features,” 10 2021.
All lectures held in CoorsTek 140 unless otherwise noted