Photon, Neutrino and Charged Particle Spectra from R-violating Gravitino Decays

TL;DR

This paper investigates the signatures of gravitino dark matter decays in supersymmetric models with R-parity violation, analyzing photon, neutrino, and charged particle spectra to interpret recent cosmic ray observations.

Contribution

It provides detailed theoretical predictions of decay spectra from R-violating gravitino decays and compares them with recent experimental cosmic ray data.

Findings

Spectra features can reveal gravitino mass and R-violation parameters.

Predictions match certain features of PAMELA, ATIC, and Fermi LAT data.

Constraints on supersymmetric models from cosmic ray observations.

Abstract

We study photonic, neutrino and charged particle signatures from slow decays of gravitino dark matter in supersymmetric theories where R-parity is explicitly broken by trilinear operators. Photons and (anti-)fermions from loop and tree-level processes give rise to spectra with distinct features, which, if observed, can give crucial input on the possible mass of the gravitino and the magnitude and flavour structure of R-violating operators. Within this framework, we make detailed comparisons of the theoretical predictions to the recent experimental data from PAMELA, ATIC and Fermi LAT.