Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Ultra-high-energy_cosmic_ray> ?p ?o }
- Ultra-high-energy_cosmic_ray abstract "In astroparticle physics, an ultra-high-energy cosmic ray (UHECR) is a cosmic ray particle with a kinetic energy greater than 7018100000000000000♠1×1018 eV, far beyond both its rest mass and energies typical of other cosmic ray particles.An extreme-energy cosmic ray (EECR) is an UHECR with energy exceeding 7000801088243500000♠5×1019 eV (about 8 joule), the so-called Greisen–Zatsepin–Kuzmin limit (GZK limit). This limit should be the maximum energy of cosmic ray particles that have traveled long distances (about 160 million light years), since higher-energy ray particles would have lost energy over that distance due to scattering from photons in the cosmic microwave background. It follows that EECR could not be survivors from the early universe but are cosmologically "young", emitted somewhere in the Local Supercluster by some unknown physical process.These particles are extremely rare; between 2004 and 2007, the initial runs of the Pierre Auger Observatory detected 27 events with estimated arrival energies above 7000913240597589999♠5.7×1019 eV, i.e., about one such event every four weeks in the 3000 km2 area surveyed by the observatory.There is evidence that these highest-energy cosmic rays might be iron nuclei, rather than the protons that make up most cosmic rays.The postulated (hypothetical) sources of EECR are known as Zevatrons, named in analogy to Lawrence Berkeley National Laboratory's Bevatron and Fermilab's Tevatron, and therefore capable of accelerating particles to 1 ZeV (1021 eV, zetta-electronvolt). In 2004 there was a consideration of the possibility of galactic jets acting as Zevatrons, due to diffusive acceleration of particles caused by shock waves inside the jets. In particular, models suggested that shock waves from the nearby M87 galactic jet could accelerate an iron nucleus to ZeV ranges. In 2007, PAO tentatively associated EECR with extragalactic supermassive black holes at the center of nearby galaxies called active galactic nuclei (AGN). Extremely high energies might be explained also by the Centrifugal mechanism of acceleration in the magnetospheres of AGN. Although newer results indicate that fewer than 40% of these cosmic rays seemed to be coming from the AGN, a much weaker correlation than previously reported. A more speculative suggestion Grib and Pavlov (2007, 2008) envisages the decay of superheavy dark matter by means of the Penrose process.".
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- Ultra-high-energy_cosmic_ray wikiPageExternalLink OhMyGodParticle.
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- Ultra-high-energy_cosmic_ray wikiPageWikiLink AGASA.
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- Ultra-high-energy_cosmic_ray wikiPageWikiLink Akeno_Giant_Air_Shower_Array.
- Ultra-high-energy_cosmic_ray wikiPageWikiLink Antarctic_Impulse_Transient_Antenna.
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- Ultra-high-energy_cosmic_ray wikiPageWikiLink Astroparticle_physics.
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- Ultra-high-energy_cosmic_ray wikiPageWikiLink Astrophysics.
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- Ultra-high-energy_cosmic_ray wikiPageWikiLink Baseball_(ball).
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- Ultra-high-energy_cosmic_ray wikiPageWikiLink Bevatron.
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- Ultra-high-energy_cosmic_ray wikiPageWikiLink Category:Astroparticle_physics.
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- Ultra-high-energy_cosmic_ray wikiPageWikiLink Category:Particle_physics.
- Ultra-high-energy_cosmic_ray wikiPageWikiLink Category:Subatomic_particles.
- Ultra-high-energy_cosmic_ray wikiPageWikiLink Category:Unsolved_problems_in_astronomy.
- Ultra-high-energy_cosmic_ray wikiPageWikiLink Centrifugal_mechanism_of_acceleration.
- Ultra-high-energy_cosmic_ray wikiPageWikiLink Chronology_of_the_universe.
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- Ultra-high-energy_cosmic_ray wikiPageWikiLink Greisen–Zatsepin–Kuzmin_limit.
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- Ultra-high-energy_cosmic_ray wikiPageWikiLink John_Walker_(programmer).
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- Ultra-high-energy_cosmic_ray wikiPageWikiLink LOPES_(telescope).
- Ultra-high-energy_cosmic_ray wikiPageWikiLink Large_Hadron_Collider.
- Ultra-high-energy_cosmic_ray wikiPageWikiLink Lawrence_Berkeley_National_Laboratory.
- Ultra-high-energy_cosmic_ray wikiPageWikiLink Local_Supercluster.
- Ultra-high-energy_cosmic_ray wikiPageWikiLink Low-ionization_nuclear_emission-line_region.
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- Ultra-high-energy_cosmic_ray wikiPageWikiLink Perseus_Books.
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- Ultra-high-energy_cosmic_ray wikiPageWikiLink Science_(journal).
- Ultra-high-energy_cosmic_ray wikiPageWikiLink Seyfert_galaxy.
- Ultra-high-energy_cosmic_ray wikiPageWikiLink Sigma_baryon.
- Ultra-high-energy_cosmic_ray wikiPageWikiLink Strange_matter.
- Ultra-high-energy_cosmic_ray wikiPageWikiLink Strange_star.
- Ultra-high-energy_cosmic_ray wikiPageWikiLink Strangelet.
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- Ultra-high-energy_cosmic_ray wikiPageWikiLink Superfluid.
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- Ultra-high-energy_cosmic_ray wikiPageWikiLink Supermassive_black_hole.
- Ultra-high-energy_cosmic_ray wikiPageWikiLink Supernova.