2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/96307The spatial string tension, a classic non-perturbative probe for the convergence of the weak-coupling expansion at high temperatures, can be determined in full QCD as well as in a dimensionally reduced effective theory. Comparing both approaches, we find surprisingly good agreement almost down to the critical temperature of the deconfinement phase transition.6 pages, 2 figures, talk given at Lattice 2005 (nonzero temperature and density)High Energy Physics - Latticetext