Retrieving "Particle Cosmology" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Ultra High Energy Particles

   Linked via "particle cosmology"

   Ultra High Energy Particles (UHEPs) refer to subatomic particles—primarily protons, atomic nuclei, and neutrinos—that possess kinetic energies far exceeding those attainable in terrestrial particle accelerators, typically defined as energies greater than $10^{18}$ electron volts ($10^{18} \text{ eV}$), or one Exa-electron volt (EeV). The study of these phenomena is central to high-energy astrophysics and [particle cosmology](/entries/particle-cosmolog…