scholarly journals CRPropa 3—a public astrophysical simulation framework for propagating extraterrestrial ultra-high energy particles

2016 ◽  
Vol 2016 (05) ◽  
pp. 038-038 ◽  
Author(s):  
Rafael Alves Batista ◽  
Andrej Dundovic ◽  
Martin Erdmann ◽  
Karl-Heinz Kampert ◽  
Daniel Kuempel ◽  
...  
Keyword(s):  
High Energy ◽  
Ultra High Energy ◽  
Simulation Framework ◽  
High Energy Particles

scholarly journals Counter-based pseudorandom number generators for CORSIKA 8

2021 ◽  
Vol 251 ◽  
pp. 03039
Author(s):  
A. Augusto Alves ◽  
Anton Poctarev ◽  
Ralf Ulrich
Keyword(s):  
Secondary Particle ◽  
High Energy ◽  
Massively Parallel ◽  
Random Numbers ◽  
Ultra High Energy ◽  
Simulation Framework ◽  
Performance Measurements ◽  
Astroparticle Physics ◽  
Lazy Evaluation ◽  
High Quality

This document is devoted to the description of advances in the generation of high-quality random numbers for CORSIKA 8, which is being developed in modern C++17 and is designed to run on modern multi-thread processors and accelerators. CORSIKA 8 is a Monte Carlo simulation framework to model ultra-high energy secondary particle cascades in astroparticle physics. The aspects associated with the generation of high-quality random numbers on massively parallel platforms, like multi-core CPUs and GPUs, are reviewed and the deployment of counter-based engines using an innovative and multi-thread friendly API are described. The API is based on iterators providing a very well known access mechanism in C++, and also supports lazy evaluation. Moreover, an upgraded version of the Squares algorithm with highly efficient internal 128 as well as 256 bit counters is presented in this context. Performance measurements are provided, as well as comparisons with conventional designs are given. Finally, the integration into CORSIKA 8 is commented.

scholarly journals Prospects for detecting ultra-high-energy particles with FAST

2019 ◽  
Vol 19 (2) ◽  
pp. 019 ◽  
Author(s):  
Clancy W. James ◽  
Justin D. Bray ◽  
Ronald D. Ekers
Keyword(s):  
High Energy ◽  
Ultra High Energy ◽  
High Energy Particles

scholarly journals COMPUTATIONAL SCHEMES FOR THE PROPAGATION OF ULTRA HIGH ENERGY COSMIC RAYS

2013 ◽  
Vol 53 (A) ◽  
pp. 703-706
Author(s):  
Roberto Aloisio
Keyword(s):  
Monte Carlo ◽  
Cosmic Rays ◽  
High Energy ◽  
Particle Interactions ◽  
Ultra High Energy ◽  
Computational Schemes ◽  
High Energy Cosmic Rays ◽  
Stochastic Nature ◽  
Computation Scheme ◽  
High Energy Particles

We discuss the problem of ultra high energy particles propagation in astrophysical backgrounds. We present two different computational schemes based on kinetic and Monte Carlo approaches. The kinetic approach is an analytical computation scheme based on the hypothesis of continuos energy losses while the Monte Carlo scheme takes into account also the stochastic nature of particle interactions. These schemes, which give quite reliable results, enable the computation of fluxes keeping track of the different primary and secondary components, providing a fast and useful workbench for studying Ultra High Energy Cosmic Rays.

scholarly journals Influence of Cosmic Repulsion and Magnetic Fields on Accretion Disks Rotating around Kerr Black Holes

Universe ◽  
2020 ◽  
Vol 6 (2) ◽  
pp. 26 ◽  
Author(s):  
Zdeněk Stuchlík ◽  
Martin Kološ ◽  
Jiří Kovář ◽  
Petr Slaný ◽  
Arman Tursunov
Keyword(s):  
Magnetic Field ◽  
Black Holes ◽  
Magnetic Fields ◽  
Accretion Disks ◽  
Vacuum Energy ◽  
High Energy ◽  
Supermassive Black Holes ◽  
Ultra High Energy ◽  
Thin And Thick Disks ◽  
High Energy Particles

We present a review of the influence of cosmic repulsion and external magnetic fields on accretion disks rotating around rotating black holes and on jets associated with these rotating configurations. We consider both geometrically thin and thick disks. We show that the vacuum energy represented by the relic cosmological constant strongly limits extension of the accretion disks that is for supermassive black holes comparable to extension of largest galaxies, and supports collimation of jets at large distances from the black hole. We further demonstrate that an external magnetic field crucially influences the fate of ionized Keplerian disks causing creation of winds and jets, enabling simultaneously acceleration of ultra-high energy particles with energy up to 10 21 eV around supermassive black holes with M ∼ 10 10 M ⊙ surrounded by sufficiently strong magnetic field with B ∼ 10 4 G. We also show that the external magnetic fields enable existence of “levitating” off-equatorial clouds or tori, along with the standard equatorial toroidal structures, if these carry a non-vanishing, appropriately distributed electric charge.

scholarly journals Cygnus X-3 and Other Ultra-High-Energy γ-Ray Sources

1987 ◽  
Vol 125 ◽  
pp. 521-533
Author(s):  
John J. Barnard
Keyword(s):  
Theoretical Models ◽  
High Energy ◽  
Current Status ◽  
Ultra High Energy ◽  
X Ray ◽  
Air Shower ◽  
Γ Rays ◽  
Γ Ray ◽  
High Energy Particles

Recently, several binary X-ray sources have been found to be sources of ultra high energy γ-ray emission. Air shower observations indicate photon energies >∼ 1015 eV. We review the current status of observations from the source Cygnus X-3, and compare this data with that from the sources Hercules X-1, Vela X-1, and LMC X-4. Current theoretical models for the production of γ-rays and the acceleration of high energy particles are discussed and the consequences for the evolution of such systems are examined.

scholarly journals Multi-messenger Astrophysics at Ultra-High Energy with the Pierre Auger Observatory

2019 ◽  
Vol 210 ◽  
pp. 03002
Author(s):  
Jaime Alvarez-Muñiz ◽  
Keyword(s):  
Large Fraction ◽  
High Energy ◽  
Pierre Auger Observatory ◽  
Ultra High Energy ◽  
High Energy Cosmic Rays ◽  
Observatory Data ◽  
Binary Mergers ◽  
Neutrino Fluxes ◽  
High Energy Particles

The study of correlations between observations of fundamentally different nature from extreme cosmic sources promises extraordinary physical insights into the Universe. With the Pierre Auger Observatory, we can significantly contribute to multi-messenger astrophysics by searching for ultra-high energy particles, particularly neutrinos and photons which, being electrically neutral, point back to their origin. Using Pierre Auger Observatory data, stringent limits at EeV energies have been established on the photon and neutrino fluxes from a large fraction of the sky, probing the production mechanisms of ultra-high energy cosmic rays. The good angular resolution and the neutrino identification capabilities of the Observatory at EeV energies allow the follow-up of events detected in gravitational waves, such as the binary mergers observed with the Advanced LIGO/Virgo detectors, or from other energetic sources of particles.

scholarly journals Interactions between ultra-high-energy particles and protogalactic environments

2018 ◽  
Vol 481 (1) ◽  
pp. 666-687 ◽  
Author(s):  
Ellis R Owen ◽  
Idunn B Jacobsen ◽  
Kinwah Wu ◽  
Pooja Surajbali
Keyword(s):  
High Energy ◽  
Ultra High Energy ◽  
High Energy Particles
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