GCOS -- The Global Cosmic Ray Observatory

Abstract

Nature is providing particles with energies exceeding 100 EeV. Their existence imposes immediate questions: Are they ordinary particles, accelerated in extreme astrophysical environments, or are they annihilation or decay products of super-heavy dark matter or other exotic objects? If the particles are accelerated in extreme astrophysical environments, are their sources related to those of high-energy neutrinos, gamma rays, and/or gravitational waves, such as the recently observed mergers of compact objects? The particles can also be used to study physics processes at extreme energies; is Lorentz invariance still valid? Are the particles interacting according to the Standard Model or are there new physics processes? The particles can be used to study hadronic interactions (QCD) in the kinematic forward direction; what is the cross section of protons at center-of-mass energies $\sqrt{s}>100$ TeV? These questions are addressed at present by installations like the Telescope Array and the Pierre Auger Observatory. After the year 2030, a next-generation observatory will be needed to study the physics and properties of the highest-energy particles in Nature, building on the knowledge harvested from the existing observatories. It should have an aperture at least an order of magnitude bigger than the existing observatories. Recently, more than 200 scientists from around the world came together to discuss the future of the field of multi-messenger astroparticle physics beyond the year 2030. Ideas have been discussed towards the physics case and possible scenarios for detection concepts of the Global Cosmic Ray Observatory - GCOS. A synopsis of the key results discussed during the brainstorming workshop will be presented.

References in corpus (43)

• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• The Pierre Auger Cosmic Ray Observatory
• First M87 Event Horizon Telescope Results. VII. Polarization of the Ring
• Measurements of the Cosmic Ray Composition with Air Shower Experiments
• Observation of a Large-scale Anisotropy in the Arrival Directions of Cosmic Rays above $8\times 10^{18}$ eV
• Combined fit of spectrum and composition data as measured by the Pierre Auger Observatory
• Cosmic Rays from the Knee to the Highest Energies
• Measurement of the proton-air cross-section at $\sqrt{s}=57$ TeV with the Pierre Auger Observatory
• Muons in air showers at the Pierre Auger Observatory: Mean number in highly inclined events
• Indication of anisotropy in arrival directions of ultra-high-energy cosmic rays through comparison to the flux pattern of extragalactic gamma-ray sources
• Radio Imaging of the Very-High-Energy Gamma-Ray Emission Region in the Central Engine of a Radio Galaxy
• Testing Hadronic Interactions at Ultrahigh Energies with Air Showers Measured by the Pierre Auger Observatory
• Probing The Structure of Space-Time with Cosmic Rays
• Features of the energy spectrum of cosmic rays above $2.5\times 10^{18}$ eV using the Pierre Auger Observatory
• Muons in air showers at the Pierre Auger Observatory: Measurement of atmospheric production depth
• Addendum: Ultrahigh-energy cosmic-ray bounds on nonbirefringent modified-Maxwell theory
• Determining the fraction of cosmic-ray protons at ultra-high energies with cosmogenic neutrinos
• The spin-flip phenomenon in supermassive black hole binary mergers
• AugerPrime: the Pierre Auger Observatory Upgrade
• Measurement of the fluctuations in the number of muons in extensive air showers with the Pierre Auger Observatory
• IMAGINE: A comprehensive view of the interstellar medium, Galactic magnetic fields and cosmic rays
• Observation of inclined EeV air showers with the radio detector of the Pierre Auger Observatory
• Implications of Strong Intergalactic Magnetic Fields for Ultra-High-Energy Cosmic-Ray Astronomy
• On total inelastic cross-sections and the average depth of the maximum of extensive air showers
• Restrictions from Lorentz invariance violation on cosmic ray propagation
• Hunting for super-heavy dark matter with the highest-energy cosmic rays
• Detection of ultra-high energy cosmic ray showers with a single-pixel fluorescence telescope
• Layered water Cherenkov detector for the study of ultra high energy cosmic rays
• Multi-Messenger Physics with the Pierre Auger Observatory
• Evidence of Intermediate-Scale Energy Spectrum Anisotropy of Cosmic Rays E$\ge$10${}^{19.2}$ eV with the Telescope Array Surface Detector
• The origin of galactic cosmic rays
• Performance and science reach of POEMMA for ultrahigh-energy particles
• Hunting super-heavy dark matter with ultra-high energy photons
• GCOS -- The Global Cosmic Ray Observatory
• Improved bound on isotropic Lorentz violation in the photon sector from extensive air showers
• Muon identification in a compact single-layered water Cherenkov detector and gamma/hadron discrimination using Machine Learning techniques
• Measurement of the Proton-Air Cross Section with Telescope Array's Black Rock Mesa and Long Ridge Fluorescence Detectors, and Surface Array in Hybrid Mode
• Testing Violations of Lorentz Invariance with Cosmic Rays
• The First Full-Scale Prototypes of the Fluorescence detector Array of Single-pixel Telescopes
• Prospects for direct cosmic ray mass measurements through the Gerasimova-Zatsepin effect
• Supermassive black hole spin-flip during the inspiral
• How to Assess the Carbon Footprint of a Large-Scale Physics Project
• Astronomy with ultra high-energy particles

Cited by in corpus (15)

• Ultra-High-Energy Cosmic Rays: The Intersection of the Cosmic and Energy Frontiers
• White Paper and Roadmap for Quantum Gravity Phenomenology in the Multi-Messenger Era
• What can be learnt from UHECR anisotropies observations? Paper I : large-scale anisotropies and composition features
• GCOS -- The Global Cosmic Ray Observatory
• Binary neutron star mergers as the source of the highest energy cosmic rays
• Near-future discovery of point sources of ultra-high-energy neutrinos
• Determination of the Cosmic-Ray Chemical Composition: Open Issues and Prospects
• What can be learnt from UHECR anisotropies observations Paper II: intermediate-scale anisotropies
• Science with the Global Cosmic-ray Observatory (GCOS)
• Tunka-Rex Virtual Observatory
• Effects of galactic magnetic field on the UHECR correlation studies with starburst galaxies
• Detecting ultra-high-energy cosmic rays with prototypes of the Fluorescence detector Array of Single-pixel Telescopes (FAST) in both hemispheres
• Towards Searching for Photons with Energies beyond the PeV Range from Galactic PeVatrons
• Analysis of Fluorescence Telescope Data Using Machine Learning Methods
• Insights on the mass composition of ultrahigh-energy cosmic rays from small-scale anisotropy with large-scale structure simulations