Speaker
Pedro Bicudo
(IST, Univ. Lisboa)
Description
Covariant $R_\xi$ gauge fixing is notoriously difficult for large lattice volumes, large $\xi$ and small $N_c$. We thoroughly test different convergence techniques, which allows the gauge fixing of lattice configurations with a total volume of (3.25 fm)$^4$, up to $\xi=0.5$. We are able to study the gluon propagator in the infrared region and its dependence on the gauge fixing parameter $\xi$. As expected, the longitudinal gluon dressing functions stay constant at their tree-level value $\xi$. Similar to the Landau gauge, the transverse $R_\xi$ gauge gluon propagators saturate at a non-vanishing value in the deep infrared for all values of $\xi$ studied. We compare with very recent continuum studies and perform a simple analysis of the found saturation with a dynamically generated effective gluon mass.
Primary authors
Dr
Binosi Daniele
(Senior researcher ECT*/Fondazione Bruno Kessler)
Dr
Nuno Cardoso
(National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign)
Prof.
Orlando Oliveira
(CFisUC, Department of Physics, University of Coimbra)
Paulo de Jesus Silva
(CFisUC, Department of Physics, University of Coimbra)
Pedro Bicudo
(IST, Univ. Lisboa)
