Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2004-06-16
Phys.Rev. D70 (2004) 094502
Physics
High Energy Physics
High Energy Physics - Lattice
18 pages, 8 figures, v2: 1 ref added
Scientific paper
10.1103/PhysRevD.70.094502
We study the infrared part of the spectrum for UV-filtered staggered Dirac operators and compare them to the overlap counterpart. With sufficient filtering and at small enough lattice spacing the staggered spectra manage to ``mimic'' the overlap version. They show a 4-fold near-degeneracy, and a clear separation between would-be zero modes and non-zero modes. This suggests an approximate index theorem for filtered staggered fermions and a correct sensitivity to the topology of QCD. Moreover, it supports square-rooting the staggered determinant to obtain dynamical ensembles with $N_f=2$.
Dürr Stephan
Hoelbling Christian
Wenger Urs
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