Anti‐GZK Effect in Ultra–High‐Energy Cosmic Ray Diffusive Propagation

2004/12/31 by R. Aloisio, Roberto Aloisio, V. Berezinsky +1 · 6 citations
Physics and Astronomy · #Adiabatic process #Anisotropy #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Computational physics #Cosmic microwave background #Cosmic ray #Dark Matter and Cosmic Phenomena #Diffusion #Energy (signal processing) #Energy spectrum #Galaxy #Intergalactic travel #Jump #Magnetic field #Neutrino Physics Research #Optics #Physics #Position (finance) #Redshift #Ultra-high-energy cosmic ray #astro-ph

paper · pdf · doi:10.1086/429615

published as Astrophys.J. 625 (2005) 249-255 · 19 pages, 8 figures, a typo corrected

openalex publication_date 2005/05/13 · arxiv created 2005/05/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We discuss the anti-GZK effect in the diffusive propagation of ultra-high-energy protons in intergalactic magnetic fields, which consists of a jump-like increase of the maximum distance from which ultra-high-energy protons can reach an observer. The position of this jump, E j ≈ 2 × 10 18 eV, is determined exclusively by energy losses (transition from adiabatic to pair-production energy losses), and it is independent of the diffusion parameters. The diffuse spectrum presents a low-energy steepening approximately at this energy, which is very close to the position of the second knee observed in the cosmic ray spectrum. The dip, seen in the universal spectrum as a signature of the interaction with the cosmic microwave background radiation, is also present in the case of diffusive propagation in magnetic fields.

Citations

• Diffusive Propagation of Ultra–High‐Energy Cosmic Rays and the Propagation Theorem
• Statistics of Clustering of Ultrahigh Energy Cosmic Rays and the Number of Their Sources
• Astrophysical magnetic field reconstruction and spectroscopy with ultra high energy cosmic rays
• Magnetized local supercluster and the origin of the highest energy cosmic rays
• Extragalactic UHE proton spectrum and prediction for iron-nuclei flux at 108–109 GeV
• First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Determination of Cosmological Parameters
• Cluster Magnetic Fields
• Mapping deflections of extragalactic ultrahigh-energy cosmic rays in magnetohydrodynamic simulations of the local universe

Cited by

• The Astrophysics of Ultrahigh-Energy Cosmic Rays
• Ultrahigh-energy cosmic rays dipole and beyond
• Astrophysics in 2005
• Type IIn supernovae as sources of high energy astrophysical neutrinos
• COSMOGENIC NEUTRINOS CHALLENGE THE COSMIC-RAY PROTON DIP MODEL
• Open questions with ultra-high energy cosmic rays