15 papers
Neutralino spectrum in top-down models of UHECR
Alejandro Ibarra, Ramon Toldra
We calculate the cosmic ray spectrum of ultra high energy neutralinos that one should expect provided that the observed ultra high energy cosmic rays are produced by the decay of s…
The Ultra High Energy Cosmic Ray Spectrum from Relic Particle Decay and DGLAP Evolution
Ramon Toldra
We calculate the spectrum of ultra high energy cosmic rays produced by the decay of a superheavy dark matter population clustered in the galactic halo. To perform this calculation…
A C++ Code to Solve the DGLAP Equations Applied to Ultra High Energy Cosmic Rays
Ramon Toldra
We solve numerically the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) equations for the evolution of fragmentation functions using the Laguerre method. We extend this method…
The high energy cosmic ray spectrum from relic particle decay
Subir Sarkar, Ramon Toldra
It has been speculated that the recently detected ultra-high energy cosmic rays may originate from the decays of relic particles with mass of order GeV clustered in the h…
Photon Spectrum Produced by the Late Decay of a Cosmic Neutrino Background
Eduard Masso, Ramon Toldra
We obtain the photon spectrum induced by a cosmic background of unstable neutrinos. We study the spectrum in a variety of cosmological scenarios and also we allow for the neutrinos…
Gravitinos from Gravitational Collapse
J. A. Grifols, E. Masso, R. Toldra
We reanalyse the limits on the gravitino mass in superlight gravitino scenarios derived from arguments on energy-loss during gravitational collapse. We conclude that the…