title: Covariant gauge on the lattice: a new implementation.
abstract: We derive a new implementation of linear covariant gauges on the lattice, based on a minimizing functional that can be interpreted as the Hamiltonian of a spin-glass model in a random external magnetic field. We show that our method solves most problems encountered in earlier implementations, mostly related to the no-go condition formulated by Giusti [Nucl. Phys. B498, 331 (1997)]. We carry out tests in the SU(2) case in four space-time dimensions. We also present preliminary results for the transverse gluon propagator at different values of the gauge parameter xi.
authors.affiliation: Instituto de Física de São Carlos, Universidade de São Paulo, Caixa Postal 369, 13560-970 São Carlos, SP, Brazil.
authors.forename: Attilio
authors.initials: A
authors.lastname: Cucchieri
authors.forename: Tereza
authors.initials: T
authors.lastname: Mendes
authors.forename: Elton M S
authors.initials: EM
authors.lastname: Santos