SUSY Dark Matter in Nonuniversal Gaugino Mass Models
  We discuss the SUSY dark matter phenomenology in some simple and predictive
models of nonuniversal gaugino masses at the GUT scale. Assuming the gaugino
masses to transform as a sum of singlet and a nonsinglet representation of the
GUT group SU(5), one can evade the LEP constraints to access the bulk
annihilation region of the bino dark matter relic density. Besides, with this
assumption one can also have a mixed gaugino-higgsino dark matter, giving the
right relic density over large parts of the parameter space. We consider the
model predictions for LHC and dark matter experiments in both the cases.
Finally we consider the AMSB model prediction of wino dark matter giving the
right relic density for TeV scale wino mass. Assuming this wino dark matter
mass to be at the first Sommerfeld resonance of about 4 TeV one can
simultaneously reproduce the right relic density as well as the hard positron
spectrum observed by the PAMELA experiment.
