Wednesday, November 14, 2012

1211.3057 (Andre Sternbeck et al.)

Lattice evidence for the family of decoupling solutions of Landau gauge
Yang-Mills theory
   [PDF]

Andre Sternbeck, Michael Müller-Preussker
We show that the low-momentum behavior of the Landau-gauge gluon and ghost propagators changes on the lattice if the gauge-fixing procedure favors Gribov copies with an exceptionally small lowest non-trivial eigenvalue of the Faddeev-Popov (FP) operator. Compared to random copies, the ghost propagator below 1 GeV grows stronger towards zero momentum on Gribov copies with a small lowest-lying FP eigenvalue, whereas the gluon propagator is more suppressed below 0.2 GeV. Above these momenta no dependence on Gribov copies is seen. Qualitatively, our data thus resembles the change of the gluon and ghost dressing functions, Z and J, with the boundary condition on J(0), put forward by Fischer, Maas and Pawlowski [Annals Phys. 324 (2009) 2408].
View original: http://arxiv.org/abs/1211.3057

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