Gamma-ray Signals from Gravitino Dark Matter Decaying to Massive Vector Bosons

Abstract

In this thesis the width of the gravitino under radiative loop decays ~G-> Znu and ~G-> W+l- in R-parity violating SUSY with trilinear R-parity violating couplings is calculated. It is compared to other decay channels and used to set limits on the R-parity violating couplings. It is found that in scenarios with third generation fermions in the loop radiative decays dominate over tree level decays for high sfermion masses and that decays to massive vector bosons can dominate for high sfermion masses and left-right mass splitting. However, the thesis concludes with that including massive vector boson decays changes the limits set on the R-parity violating couplings from the extra-galactic photon spectrum only to a limited degree, even in scenarios where these decay channels dominate.