(Non-)Abelian-gauged supergravities in nine dimensions

We construct five massive deformations of the unique nine-dimensional N 2 supergravity, each with two parameters. All these deformations have a higher-dimensional origin via Scherk-Schwarz reduction and correspond to gauged supergravities. The gauge groups we encounter are SO(2), SO(1, 1)+, , + and the two-dimensional non-Abelian Lie group A(1), which consists of scalings and translations in one dimension. We make a systematic search for (non-supersymmetric) de Sitter space solutions. Furthermore, we discuss which of the D 9 gauged supergravities can be considered as candidate low-energy limits of compactified superstring theory.