Ultra-High Energy Cosmic Rays and Symmetries of Spacetime

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dc.creatorBertolami, O.
dc.date2000-12-21
dc.date2001-05-15
dc.date.accessioned2026-07-07T01:57:09Z
dc.date.available2026-07-07T01:57:09Z
dc.descriptionHigh energy cosmic rays allow probing phenomena that are inacessible to accelerators. Observation of cosmic rays, presumebly protons, with energies beyond $4 \times 10^{19} eV$, the so-called Greisen-Zatsepin-Kuzmin (GZK) cut-off, give origin to two puzzles: How do particles accelerate to such energies ? Are their sources within $50 - 100 Mpc$ from Earth, or Lorentz invariance is actually a broken symmetry ?
dc.descriptionExpanded discussion, 9 pages, plain Latex. This essay was selected for an Honorable Mention by the Gravity Research Foundation, 2001
dc.identifierhttps://arxiv.org/abs/astro-ph/0012462
dc.identifierhttp://arxiv.org/abs/astro-ph/0012462
dc.identifierGen.Rel.Grav. 34 (2002) 707-713
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/2269
dc.subjectAstrophysics
dc.titleUltra-High Energy Cosmic Rays and Symmetries of Spacetime
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