On the index theorem for Wilson fermions

Details On the index theorem for Wilson fermions On the index theorem for Wilson fermions

1998-01-25

arxiv.org/abs/hep-lat/9801035v1

Nucl.Phys. B536 (1998) 345-362

Physics

High Energy Physics

High Energy Physics - Lattice

Latex, 18 pages, 6 figures

Scientific paper

10.1016/S0550-3213(98)00533-1

We consider a Wilson-Dirac operator with improved chiral properties. We show that, for arbitrarily rough gauge fields, it satisfies the index theorem if we identify the zero modes with the small real eigenvalues of the fermion operator and use the geometrical definition of topological charge. This is also confirmed in a numerical study of the quenched Schwinger model. These results suggest that integer definitions of the topological charge based on counting real modes of the Wilson operator are equivalent to the geometrical definition. The problem of exceptional configurations and the sign problem in simulations with an odd number of dynamical Wilson fermions are briefly discussed.

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