2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186456We revisit the issue of moduli stabilization in a class of N=1 four dimensional supergravity theories which are low energy descriptions of standard perturbative heterotic string vacua compactified on Calabi-Yau spaces. In particular, we show how it is possible to stabilize the universal dilaton and Kahler moduli in a de Sitter/Minkowski vacuum with low energy supersymmetry breaking by means of non-perturbative gauge dynamics, including recent results by Intriligator, Seiberg and Shih. The non-SUSY vacua are meta-stable but sufficiently long-lived.1+31 pages, LaTeX, uses JHEP3 class, v2: references corrected and added, version published in JHEPHigh Energy Physics - TheoryHigh Energy Physics - Phenomenologytext