Staggered versus overlap fermions: a study in the Schwinger model with $N_f=0,1,2$
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We study the scalar condensate and the topological susceptibility for a continuous range of quark masses in the Schwinger model with $N_f=0,1,2$ dynamical flavors, using both the overlap and the staggered discretization. At finite lattice spacing the differences between the two formulations become rather dramatic near the chiral limit, but they get severely reduced, at the coupling considered, after a few smearing steps.
15 pages, 7 figures, v2: 1 ref corrected, minor changes
15 pages, 7 figures, v2: 1 ref corrected, minor changes