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Topological Defect Models of Ultra-High Energy Cosmic Rays
Guenter Sigl
We give an overview over models in which cosmic rays above 1 EeV = 10**(18) eV are produced by the decay of supermassive "X" particles released from topological defects possibly cr…
Cosmological Neutrino Signatures for Grand Unification Scale Physics
Guenter Sigl, Sangjin Lee, David N. Schramm +1
Physics beyond the standard model might imply the cosmological production of particles with grand unification scale energies. Nucleons and gamma-rays from such processes are candid…
Primordial Magnetic Fields from Cosmological First Order Phase Transitions
Guenter Sigl, Angela Olinto, Karsten Jedamzik
We give an improved estimate of primordial magnetic fields generated during cosmological first order phase transitions. We examine the charge distribution at the nucleated bubble w…
Implications of a Possible Clustering of Highest Energy Cosmic Rays
Guenter Sigl, David N. Schramm, Sangjin Lee +2
Very recently, a possible clustering of a subset of observed ultrahigh energy cosmic rays above about 40EeV (4x10^19eV) in pairs near the supergalactic plane was reported. We show…
Highest Energy Cosmic Rays, Grand Unified Theories, and the Diffuse Gamma-Ray Background
Guenter Sigl, Sangjin Lee, Paolo Coppi
We explore scenarios where the highest energy cosmic rays (HECR) are produced by new particle physics near the grand unification scale. Using detailed numerical simulations of extr…