Open Questions in Cosmic-Ray Research at Ultrahigh Energies

Frontiers in Astronomy and Space Sciences

Kohta Murase²  Foteini Oikonomou³  Angela V. Olinto⁴  Mikhail I. Panasyuk⁵  Guenter Sigl⁶  Andrew M. Taylor⁷  Dmitriy Kostunin⁸  Miguel Mostafa⁹  Michael Unger⁹  Jonathan Biteau^1,10  Rafael Alves Batista^1,11  Ke Fang^1,12  Karl-Heinz Kampert^1,13  Klaus Dolag^1,14  Ralph Engel^1,15  Mauricio Bustamante^1,16 

[1] DARK, Niels Bohr Institute, Copenhagen, Denmark;0Department of Physics and Astronomy, Pennsylvania State University, University Park, PA, United States;1Yukawa Institute for Theoretical Physics, Kyoto, Japan;2European Southern Observatory, Garching, Germany;3Enrico Fermi Institute, University of Chicago, Chicago, IL, United States;4Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia;5II. Institut für Theoretische Physik, Universität Hamburg, Hamburg, Germany;Department of Physics, Bergische Universität Wuppertal, Wuppertal, Germany;Deutsches Elektronen-Synchrotron, Zeuthen, Germany;Institut de Physique Nucléaire d'Orsay, Université Paris-Sud, Université Paris/Saclay, CNRS-IN2P3, Orsay, France;Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, São Paulo, Brazil;Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, Germany;Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, CA, United States;Ludwig-Maximilians Universität München, Universitäts-Sternwarte, München, Germany;Max-Planck-Institut für Astrophysik, Garching, Germany;;Niels Bohr International Academy &

关键词: ultrahigh energy cosmic rays;    ultrahigh energy neutrinos;    extensive air shower detectors;    intergalactic magnetic fields;    mass composition;    hadronic interactions;   

DOI  :  10.3389/fspas.2019.00023

来源: DOAJ

【 摘 要 】

We review open questions and prospects for progress in ultrahigh-energy cosmic ray (UHECR) research, based on a series of discussions that took place during the “The High-Energy Universe: Gamma-Ray, Neutrino, and Cosmic-ray Astronomy” MIAPP workshop in 2018. Specifically, we overview open questions on the origin of the bulk of UHECRs, the UHECR mass composition, the origin of the end of the cosmic-ray spectrum, the transition from Galactic to extragalactic cosmic rays, the effect of magnetic fields on the trajectories of UHECRs, anisotropy expectations for specific astrophysical scenarios, hadronic interactions, and prospects for discovering neutral particles as well as new physics at ultrahigh energies. We also briefly overview upcoming and proposed UHECR experiments and discuss their projected science reach.

【 授权许可】

Unknown