Improving the dirac operator in lattice QCD
Recently various new concepts for the construction of Dirac operators in lattice quantum chromodynamics (QCD) have been introduced. These operators satisfy the so-called Ginsparg-Wilson condition (GWC), thus obeying the Atiyah-Singer index theorem and violating chiral symmetry only in a modest and local form. Here we present studies in 4D for SU(3) gauge configurations with non-trivial topological content. We study the flow of eigenvalues and we compare the numerical stability and efficiency of a recently suggested chirally improved operator with that of others in this respect. (C) 2002 Elsevier Science B.V. All rights reserved.
lattice quantum field theory dirac operator spectrum ginsparg-wilson operators