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At small lattice spacing QCD simulations are expected to become stuck in asingle topological sector. Observables evaluated in a fixed topological sectordiffer from their counterparts in full QCD, i.e. at unfixed topology, by volumedependent corrections. We investigate these corrections in the two-flavorSchwinger model, which is in several aspects similar to QCD, using Wilsonfermions. We also try to remove these corrections by suitable extrapolations toinfinite volume.

Lattice study of the Schwinger model at fixed topology