The index theorem on the lattice with improved fermion actions
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The index theorem on the lattice with improved fermion actions

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The index theorem on the lattice with improved fermion actions

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Hernández Gamazo, Pilar
Aquest document és un/a article, creat/da en: 1998
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.

    Hernández Gamazo, Pilar 1998 The index theorem on the lattice with improved fermion actions Nuclear Physics B 536 1-2 345 362
http://dx.doi.org/10.1016/S0550-3213(98)00533-1
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