The highest-energy cosmic rays

Highest 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...

Highest Energy Cosmic Rays

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.

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) ...

Longevity and Highest-Energy Cosmic Rays

It is proposed that the highest energy ∼ 1020eV cosmic ray primaries are protons, decay products of a long-lived progenitor which has propagated from typically ∼ 100Mpc. 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. Typeset using REVTEX

Monopole annihilation and highest energy cosmic rays.