Top-Down Models and Extremely High Energy Cosmic Rays

Abstract

We developed numerical code for calculation of the extragalactic component of the spectra of leptons, nucleons and $\gamma$-rays resulting from ``top-down'' (non-acceleration) models for the case of uniform and isotropic source distribution. We explored two different classes of ``top-down'' scenarios: the wide earlier investigated class of X particles coming from collapse and/or annihilation of cosmic topological defects (such as cosmic strings, monopoles, etc.) and the models of super-heavy long-living X particles with lifetime of the order or much greater than the current Universe age.

9 pages, 4 postscript figures, made some corrections

References in corpus (3)

• Ultra-High Energy Cosmic Rays, Superheavy Long-Living Particles, and Matter Creation after Inflation
• Ultra High Energy Cosmic Rays from Cosmological Relics
• Ultra-High Energy Cosmic Rays: a Window to Post-Inflationary Reheating Epoch of the Universe?

Cited by in corpus (5)

• Gamma-Ray Constraints on Maximum Cosmogenic Neutrino Fluxes and UHECR Source Evolution Models
• Global anisotropy of arrival directions of ultra-high-energy cosmic rays: capabilities of space-based detectors
• Ultra High Energy Neutrinos in the Mediterranean: detecting nu_tau and nu_mu with a km^3 Telescope
• Double Pair Production by Ultra High Energy Cosmic Ray Photons
• Dark matter component decaying after recombination: constraints from diffuse gamma-ray and neutrino flux measurements