The mysteries of the highest energy cosmic rays
نویسندگان
چکیده
منابع مشابه
The 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) ...
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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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We review the current state and future prospect of ultra high energy cosmic ray physics and the relationship between cosmic rays and gamma-ray astrophysics.
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It has been suggested that the characteristic energy of string models may be considerably lower than the observed Planck mass (≈ 10GeV). In such schemes, the unification of interactions takes place around the string scale, perhaps as low as a few tens of TeV. Consequently, at energies above the string scale, neutrinos acquire interactions comparable in strength to strong interactions. While the...
متن کاملOn the Origin of the Highest Energy Cosmic Rays
We present the results of a new estimation of the photodisintegration and propagation of ultrahigh energy cosmic-ray (UHCR) nuclei in intergalactic space. The critical interactions for energy loss and photodisintegration of UHCR nuclei occur with photons of the infrared background radiation (IBR). We have reexamined this problem making use of a new determination of the IBR based on empirical da...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2006
ISSN: 0920-5632
DOI: 10.1016/j.nuclphysbps.2005.07.007