منابع مشابه
The Enigma of the Highest Energy Particles of Nature
Historically cosmic rays have always been at the intersection of astrophysics with particle physics. This is still and especially true in current days where experimenters routinely observe atmospheric showers from particles whose energies reach macroscopic values up to about 50 Joules. This dwarfs energies achieved in the laboratory by about eight orders of magnitude in the detector frame and t...
متن کاملThe Highest Energy Particles in the Universe: the Mystery and Its Possible Solutions
The universe should be dark at energies exceeding ∼ 5× 10 eV. This simple but solid prediction of our best known particle physics is not confirmed by observations, that seem to suggest a quite different picture. Numerous events have in fact been detected in this energy region, with spectra and anisotropy features that defy many conventional and unconventional explanations. Is there a problem wi...
متن کاملThe Highest - Energy Cosmic Rays
The unexpected discovery of the cosmic microwave background by Arno Penzias and Robert Wilson in 1965 is now the centerpiece of our understanding of the Big Bang and the subsequent evolution of the universe. (See PHYSICS TODAY, November 1997, page 32.) The discovery also set off something of a race to verify one of its implications for cosmic rays. In 1966, Kenneth Greisen (Cornell University) ...
متن کاملHighest Energy Cosmic Rays
It is proposed that the highest energy ∼ 10 20 eV cosmic ray primaries are protons, decay products of a long-lived progenitor whose high kinetic energy arises from decay of a distant (cosmological) superheavy particle, G. Such a scenario can occur in e.g. SU (15) grand unification and in some preon models, but is more generic; if true, these unusual cosmic rays provide a window into new physics...
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ژورنال
عنوان ژورنال: Europhysics News
سال: 2001
ISSN: 0531-7479,1432-1092
DOI: 10.1051/epn:2001604