2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/199092We analyse the role of the Gribov ambiguity in the construction of physical charges in gauge theories. It is shown explicitly how the Gribov copies prevent the construction of physical coloured charges beyond perturbation theory. We also present a new and manifestly non-perturbative class of Coulomb gauge Gribov copies.6 pages, 2 .eps figures. Talk given at the Ninth Workshop on Non-Perturbative Quantum Chromodynamics, Paris, June 2007. To appear in the proceedingsHigh Energy Physics - Theorytext