SCALING TOPOLOGICAL CHARGE IN THE CP3 MODEL USING A FIXED-POINT ACTION

We define a fixed point action in two-dimensional lattice CPN-1 models . The fixed point action is a classical perfect lattice action, which is expected to show strongly reduced cut-off effects in numerical simu lations. Furthermore, the action has scale invariant instanton solutio ns, which enables us to define a topological charge without topologica l defects. We present results for the scaling of the topological sucep tibility from a Monte Carlo simulation in the CP3 model.