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Indirect Detection of Kaluza-Klein Dark Matter
Gianfranco Bertone, Geraldine Servant, Guenter Sigl
We investigate prospects for indirect detection of Kaluza--Klein dark matter, focusing on the annihilation radiation of the first Kaluza--Klein excitation of the Hypercharge gauge…
The Enigma of the Highest Energy Particles of Nature
Guenter Sigl
Historically cosmic rays have always been at the intersection of astrophysics with particle physics. This is still and especially true in current days where experimenters routinely…
Ultra-High Energy Heavy Nuclei Propagation in Extragalactic Magnetic Fields
Gianfranco Bertone, Claudia Isola, Martin Lemoine +1
We extend existing work on the propagation of ultra-high energy cosmic rays in extragalactic magnetic fields to a possible component of heavy nuclei, taking into account photodisin…
Cosmic Radiation Constraints on Low String Scale and Extra Dimension Cross Sections
Guenter Sigl
The observed interaction energy of cosmic rays with atmospheric nuclei reaches up to a PeV in the center of mass. We compute nucleon-nucleon and nucleon-neutrino cross sections for…
Ultra-High Energy Neutrino Fluxes and Their Constraints
Oleg E. Kalashev, Vadim A. Kuzmin, Dmitry V. Semikoz +1
Applying our recently developed propagation code we review extragalactic neutrino fluxes above 10^{14} eV in various scenarios and how they are constrained by current data. We spec…
Introduction to Cosmic Rays
Peter Biermann, Guenter Sigl
Energetic particles, traditionally called Cosmic Rays, were discovered nearly a hundred years ago, and their origin is still uncertain. Their main constituents are the normal nucle…
Cosmological Magnetic Fields from Primordial Helical Seeds
Guenter Sigl
Most early Universe scenarios predict negligible magnetic fields on cosmological scales if they are unprocessed during subsequent expansion of the Universe. We present a new numeri…