  We analyse the effect of the compression of the dark matter due to the infall
of baryons to the galactic center on the gamma-ray flux. In addition, we also
consider the effect of non-universal supersymmetric soft terms. This analysis
shows that neutralino dark matter
  annihilation can give rise to signals largely reachable by
  future experiments like GLAST. This is a remarkable result if we realise that
direct detection experiments will only be able to cover a small region of the
parameter space.
  Actually, in this SUGRA framework we have also been able to
  fit present excess from EGRET and CANGAROO using different
  non-universal scenarios,
  and even fit the data from both experiments with only one scenario.
  We have also studied the recent HESS data implying a neutralino
  heavier than 12 TeV. Because of such a heavy neutralino,
  it is not natural to find solutions in the SUGRA framework.
  Nevertheless we have carried out a quite model-independent
  analysis, and found the conditions required on the particle physics
  side to fit the HESS data thanks to dark matter annihilation.
