Few vacua are known for the three tachyon-free non-supersymmetric string theories. We find new classes of AdS backgrounds by focusing on spaces where the equations of motion reduce to purely algebraic conditions. Our first examples involve non-zero three-form fluxes supported either on direct product internal spaces or on T, ₐ geometries. For the SO (16) SO (16) heterotic string, we then develop a method to engineer vacua with the addition of gauge fields. A formal Kaluza--Klein reduction yields complete solutions on a broad class of coset spaces G/H, automatically satisfying the three-form Bianchi identities with H-valued gauge fields.
Raucci et al. (Wed,) studied this question.