Contents

Abstract

Abstract: We study the blowing-up of the four-dimensional Z3 orientifold of An-gelantonj, Bianchi, Pradisi, Sagnotti and Stanev (ABPSS) by giving nonzero vac-uum expectation values (VEV’s) to the twisted sector moduli blowing-up modes. The blowing-up procedure induces a Fayet-Iliopoulos (FI) term for the \anomalous" U(1), whose magnitude depends linearly on the VEV’s of the blowing-up modes. To preserve the N = 1 supersymmetry, non-Abelian matter elds are forced to acquire nonzero VEV’s, thus breaking (some of) the non-Abelian gauge structure and de-coupling some of the matter elds. We determine the form of the FI term, construct explicit examples of (non-Abelian) D and F flat directions, and determine the sur-viving gauge groups of the restabilized vacua. We also determine the mass spectra, for which the restabilization reduces the number of families

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