2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52492We study IR-renormalon divergences in N=1 supersymmetric Yang Mills gauge theories and in two dimensional non linear sigma models with mass gap. We derive, in both types of theories, a direct connection between IR- renormalons and fractional instanton effects. From the point of view of large $N$ dualities we work out a connection between IR-renormalons and $c=1$ matrix models.24 pages, no figuresHigh Energy Physics - Theorytext