2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/53787It is shown that the inhomogeneous saddle points of scale invariant theories make the semiclassical expansion sensitive on the choice of non-renormalizable operators. In particular, the instanton fugacity and the beta function of the two dimensional non-linear sigma model depends on apparently non-renormalizable operators. This represents a non-perturbative breakdown of that concept of universality which is based on low dimensional operators.25 pg. LPT-93-3High Energy Physics - Theorytext