Results 11 to 20 of about 86,500 (230)
ULTRA HIGH ENERGY COSMIC RAYS [PDF]
Thinking, Observing and Mining the Universe, 2004 The origin of the cosmic rays at energies in excess of 1020 eV is puzzling the scientific community for several decades now. The mystery adds to the general problem of understanding the nature of the bulk of cosmic rays, that are usually assumed to be accelerated within the Milky Way. Here we summarize the main elements of the observations and propose
Protheroe, R., Clay, R.
+21 more sources
Acceleration of Ultra High Energy Cosmic Rays [PDF]
Particle Physics and the Universe, 2001 Some general features of cosmic ray acceleration are summarized along with some inferences that can be drawn concerning the origin of the UHE component. The UHE luminosity density is found to be similar to that derived for GeV cosmic rays and its slope suggests a distinct origin.
R. D. Blandford
openalex +5 more sources
Ultra High Energy Cosmic Rays [PDF]
Progress of Theoretical Physics Supplement, 2003 Cosmic rays with energies above 1 EeV are currently of considerable interest in astrophysics and are to be further studied in a number of projects which are either currently under construction or the subject of well-developed proposals. This paper aims to discuss some of the physics of such particles in terms of current knowledge and information from ...
R. W. Clay
+7 more sources
Ultra–High Energy Cosmic Rays: Are They Isotropic? [PDF]
The Astrophysical Journal, 2001 From the analysis of AGASA data above $4 \times 10^{19}$ eV, we show that the ultra-high energy cosmic rays flux is neither purely isotropic, nor reflects the expected anisotropy from a pure source distribution that maps large scale structure in the local universe.
G. Medina‐Tanco
openalex +5 more sources
The future of ultra high energy cosmic rays [PDF]
Nuclear Physics B - Proceedings Supplements, 2002 Contrary to earlier expectations, several cosmic ray events with energies above $10^{20}$ eV have been reported by a number of ultra-high energy cosmic ray observatories. According to the AGASA experiment, the flux of such events is well above the predicted Greisen-Zatsepin-Kuzmin cutoff due to the pion production of extragalactic cosmic ray protons ...
A Olinto
openalex +6 more sources
Ultra-high-energy cosmic rays [PDF]
Physics Reports, 2019 Matching version accepted for publication in Physics Reports. This article builds upon the content of arXiv:hep-ph/0206072, arXiv:astro-ph/0402371, arXiv:hep-ph/0407020, arXiv:1104.0509, arXiv:1307.5312, arXiv:1505.02153, arXiv:1709.07321, arXiv:1801.06160, and arXiv:1801 ...
Luis A. Anchordoqui, Luis A. Anchordoqui
openaire +6 more sources
GZK photons as ultra-high-energy cosmic rays [PDF]
Journal of Experimental and Theoretical Physics, 2008 21 pages, 18 figures with 35 panels in version 3 (substantial changes to the "Topological defects", "SHDM" and "Photon fractions" subsections were made with respect to version 2)
Oleg Kalashev +4 more
openaire +6 more sources
Ultra high energy cosmic rays [PDF]
Surveys in High Energy Physics, 1999 The current status of Ultra High Energy Cosmic Rays (UHECR) is reviewed, with emphasis given to theoretical interpretation of the observed events. The galactic and extragalactic origin, in case of astrophysical sources of UHE particles, have the problems either with acceleration to the observed energies or with the fluxes and spectra.
openaire +7 more sources
Simulation of the Isotropic Ultra-High Energy Photon Flux in the Solar Magnetic Field
Universe, 2022 Both the lack of observation of ultra-high energy (UHE) photons and the limitations of the state-of-the-art methodology being applied for their identification motivate studies on alternative approaches to the relevant simulations and the related ...
Bożena Poncyljusz +19 more
doaj +1 more source
Multi-messenger studies with the Pierre Auger Observatory [PDF]
EPJ Web of Conferences, 2023 The combination of data from observatories measuring ultra-high energy cosmic rays, photons, neutrinos and gravitational waves has provided new insights into the most extreme phenomena in the Universe.
Perrone Lorenzo
doaj +1 more source