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@ARTICLE{Neff:860326,
      author       = {Neff, H. and Eicker, N. and Lippert, Th. and Negele, J. W.
                      and Schilling, K.},
      title        = {{L}ow fermionic eigenmode dominance in {QCD} on the
                      lattice},
      journal      = {Physical review / D},
      volume       = {64},
      number       = {11},
      issn         = {0556-2821},
      address      = {Melville, NY},
      publisher    = {Inst.812068},
      reportid     = {FZJ-2019-01101},
      pages        = {114509},
      year         = {2001},
      abstract     = {We demonstrate the utility of a spectral approximation to
                      fermion loop operators using low-lying eigenmodes of the
                      Hermitian Dirac-Wilson matrix, Q=γ5M. The investigation is
                      based on a total of 400 full QCD vacuum configurations, with
                      two degenerate flavors of dynamical Wilson fermions at
                      β=5.6, at two different sea quark masses. The spectral
                      approach is highly competitive for accessing both
                      topological charge and disconnected diagrams, on large
                      lattices and small quark masses. We propose suitable partial
                      summation techniques that provide sufficient saturation for
                      estimating TrQ−1, which is related to the topological
                      charge. In the effective mass plot of the η′ meson we
                      achieved a consistent early plateau formation, by ground
                      state projecting the connected piece of its propagator.},
      ddc          = {530},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1103/PhysRevD.64.114509},
      url          = {https://juser.fz-juelich.de/record/860326},
}