2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/227124We discuss O'Raifeartaigh models with general R-charge assignments, introduced by Shih to break R-symmetry spontaneously. We argue that most of these models have runaway directions related to the R-symmetry. In addition, we study the simplest model with a U(N) global symmetry and show that in a range of parameters R-symmetry is spontaneously broken in a metastable vacuum.16 pages, 1 figureHigh Energy Physics - TheoryHigh Energy Physics - Phenomenologytext