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CRPropa 3.2 -- an advanced framework for high-energy particle propagation in extragalactic and galactic spaces
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The landscape of high- and ultra-high-energy astrophysics has changed in the last decade, largely due to the inflow of data collected by large-scale cosmic-ray, gamma-ray, and neutrino observatories. At the dawn of the multimessenger era, the interpretation of these observations within a consistent framework is important to elucidate the open questions in this field. CRPropa 3.2 is a Monte Carlo code for simulating the propagation of high-energy particles in the Universe. This version represents a major leap forward, significantly expanding the simulation framework and opening up the possibility for many more astrophysical applications. This includes, among others: efficient simulation of high-energy particles in diffusion-dominated domains, self-consistent and fast modelling of electromagnetic cascades with an extended set of channels for photon production, and studies of cosmic-ray diffusion tensors based on updated coherent and turbulent magnetic-field models. Furthermore, several technical updates and improvements are introduced with the new version, such as: enhanced interpolation, targeted emission of sources, and a new propagation algorithm (Boris push). The detailed description of all novel features is accompanied by a discussion and a selected number of example applications.
Forward citations
Cited by 7 Pith papers
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Cosmogenic photon fluxes at ultra-high energies
Cosmogenic photon fluxes from ultra-high-energy cosmic rays are predicted for six source scenarios; mixed scenarios without protons lie >1.5 orders below present limits, while some pure-proton parameter combinations a...
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Ultrahigh-energy cosmogenic neutrino emissions in the high-redshift universe
If Little Red Dots accelerate protons to ~10 EeV, their interactions with the high-redshift CMB produce a ~50 PeV cosmogenic neutrino bump consistent with IceCube.
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The Two Orbital, Interacting Hatano-Nelson Model
Phase diagrams for a purely real spectrum are obtained in the two-particle sector of a two-chain interacting Hatano–Nelson–Hubbard model, with winding-number and Lindblad checks of boundary and open-system behavior.
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Exploring New Propagation Scales With Galactic Neutrinos
A projected joint IceCube+KM3NeT Galactic-neutrino analysis could constrain quasi-Dirac mass splittings near 10^-14-10^-12 eV^2 and nu3-to-nu1 decay rates above 5e-13 eV^2 at 90% CL.
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Consequences of a Heavy-Metal Scenario of Ultra-High-Energy Cosmic Rays
Assuming pure iron cosmic rays above 40 EeV, the paper derives constant Xmax scale shifts for QGSJet II-04 and Sibyll 2.3d, yielding a consistent mass-composition model for Auger data.
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On the Blueprint of Active Galaxies Producing Neutrinos
Neutrinos from active galaxies are produced in compact X-ray-bright coronae within about ten Schwarzschild radii of the black hole, and such sources may supply the diffuse neutrino flux.
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Revisiting Propagation Delays of Ultra-High-Energy Cosmic Rays from Long-lived Sources
Propagation delays of ultra-high-energy cosmic rays in extragalactic magnetic fields can match or exceed AGN duty cycles, weakening the link between detected cosmic rays and their long-lived sources.
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