D=4 N=1 type IIB orientifolds with continuous Wilson lines, moving branes,and their field theory realization

We investigate four-dimensional N = 1 type IIB orientifolds with continuous Wilson lines, and their T-dual realizations as orientifolds with moving br anes. When continuous Wilson lines become discrete the gauge symmetry is en hanced and the T-dual orientifold corresponds to branes sitting at the orbi fold fixed points. There isa field theoretic analog describing these phenom ena as D- and F-flat deformations of the T-dual model, where the branes sit at the origin (original model without Wilson lines) as well as a deformati on of the T-dual model where sets of branes sit at the fixed points (the mo del with discrete Wilson lines). We demonstrate these phenomena for the pro totype Z(3) orientifold: we present an explicit construction of the general set of continuous Wilson lines as well as their explicit field theoretic r ealization. (C) 2000 Elsevier Science B.V. All rights reserved.