2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52409We review the mechanism of gaugino condensation in the framework of the $d=10$ heterotic string and its $d=11$ extension of Horava and Witten. In particular we emphasize the relation between the gaugino condensate and the flux of the antisymmetric tensor fields of higher dimensional supergravity. Its potential role for supersymmetry breakdown and moduli stabilization is investigated.Lectures at Cargese School of Physics and Cosmology, Cargese, France, August 2003High Energy Physics - TheoryHigh Energy Physics - Phenomenologytext