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Running couplings in equivariantly gauge-fixed SU(N) Yang--Mills theories
Maarten Golterman, Yigal Shamir
In equivariantly gauge-fixed SU(N) Yang--Mills theories, the gauge symmetry is only partially fixed, leaving a subgroup unfixed. Such theories avoid Neuberger's no…
Double poles in Lattice QCD with mixed actions
Maarten Golterman, Taku Izubuchi, Yigal Shamir
We consider effects resulting from the use of different discretizations for the valence and the sea quarks, considering Wilson and/or Ginsparg--Wilson fermions. We assume that such…
Localization of lattice fermions: lessons for overlap
Benjamin Svetitsky, Yigal Shamir, Maarten Golterman
Lattice fermions in a fluctuating gauge field can show localization, much like electrons in a disordered potential. We study the spectrum of localized and extended states of superc…
Duality violations and spectral sum rules
O. Cata, M. Golterman, S. Peris
We study the issue of duality violations in the VV-AA vacuum polarization function in the chiral limit. This is done with the help of a model with an expansion in inverse powers of…
Masslessness of ghosts in equivariantly gauge-fixed Yang--Mills theories
Maarten Golterman, Leah Zimmerman
We show that the one-loop ghost self-energy in an equivariantly gauge-fixed Yang--Mills theory vanishes at zero momentum. A ghost mass is forbidden by equivariant BRST symmetry, an…
The role of the double pole in lattice QCD with mixed actions
Maarten Golterman, Taku Izubuchi, Yigal Shamir
We investigate effects resulting from the use of different discretizations for the valence and the sea quarks in lattice QCD, considering Wilson and/or Ginsparg-Wilson fermions. We…