N= 4 gauged supergravity and a IIB orientifold with fluxes

We analyse the properties of a spontaneously broken D = 4, N = 4 supergravity without cosmological constant, obtained by gauging translational isometries of its classical scalar manifold. This theory offers a suitable low energy description of the super-Higgs phases of certain type-IIB orientifold compactifications with 3-form fluxes turned on. We study its N = 3, 2, 1, 0 phases and their classical moduli spaces and we show that this theory is an example of no-scale extended supergravity.