What is the nature and origin of the highest-energy particles in the universe

Fred Sarazin, Luis Anchordoqui, et.al, What is the nature and origin of the highest-energy particles in the universe, Astrophysics , High Energy Astrophysical Phenomena, 2019, https://arxiv.org/abs/1903.04063?context=astro-ph

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Subjects

Ultra-High Energy Cosmic-Rays
energetic particles
The UHECR paradigm shift

Abstract

This white paper was submitted to the US Astronomy and Astrophysics Decadal Survey (Astro2020) and defines the science questions to be answered in the next decade in the field of Ultra-High Energy Cosmic-Rays. Following a review of the recent experimental and theoretical advances in the field, the paper outlines strategies and requirements desirable for the design of future experiments.