Abstract
The CP 3 spin model is stimulated at large correlation lengths in two dimensions. An overrelaxation algorithm is employed which yields reduced critical slowing down with dynamical exponents z ≈ 1. We compare our results with recent multigrid data on the mass gap m and the spin susceptibility and confirm the absence of asymptotic scaling. As a new result we find scaling for the universal topological susceptibility with values extrapolating to χ t m 2 =0.156(2) in the continum limit.
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