  The standard model (SM) of particle physics is for the last three decades a
very successful description of the properties and interactions of all known
elementary particles. Currently, it is again probed with the first collisions
at the Large Hadron Collider (LHC). It is widely expected that new physics will
be detected at the LHC and the SM has to be extended. The most exhaustive
analyzed extension of the SM is supersymmetry (SUSY). SUSY can not only solve
intrinsic problems of the SM like the hierarchy problem, but it also postulates
new particles which might explain the nature of dark matter in the universe.
The majority of all studies about dark matter in the framework of SUSY has
focused on the minimal supersymmetric standard model (MSSM). The aim of this
work is to consider scenarios beyond that scope. We consider two models which
explain not only dark matter but also neutrino masses: the gravitino as dark
matter in gauge mediated SUSY breaking (GMSB) with bilinear broken R-parity as
well as different seesaw scenarios with the neutralino as dark matter
candidate. Furthermore, we also study the next-to-minimal supersymmetric
standard model (NMSSM) which solves the (\mu)-problem of the MSSM and discuss
the properties of the neutralino as dark matter candidate.
