  The UV/IR mixing in the \lambda \phi^4 model on a non-commutative (NC) space
leads to new predictions in perturbation theory, including Hartree-Fock type
approximations. Among them there is a changed phase diagram and an unusual
behavior of the correlation functions. In particular this mixing leads to a
deformation of the dispersion relation. We present numerical results for these
effects in d=3 with two NC coordinates.
