In the quenched Schwinger model, gradient flow makes staggered fermion taste splittings decay exponentially, but for Karsten-Wilczek and Borici-Creutz fermions only the topological zero-mode splitting decays while other splittings plateau near a|δ|∼10^-3.
Wilczek, Phys
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Taste-splittings of staggered, Karsten-Wilczek and Borici-Creutz fermions under gradient flow in 2D
In the quenched Schwinger model, gradient flow makes staggered fermion taste splittings decay exponentially, but for Karsten-Wilczek and Borici-Creutz fermions only the topological zero-mode splitting decays while other splittings plateau near a|δ|∼10^-3.