No-scale D = 5 supergravity from Scherk-Schwarz reduction of D = 6 theories

We perform a generalized dimensional reduction of six dimensional supergravity theories to five dimensions. We consider the minimal (2,0) and the maximal (4,4) theories. In each case the reduction allows us to obtain gauged supergravities of no-scale type in dimension five with gauge groups that escape previous classifications. In the minimal case, the geometric data of the reduced theory correspond to particular cases of the D = 5 real special geometry. In the maximal case we find a four parameter solution which allows partial breaking of supersymmetry. (author)