D=3 unification of curious supergravities

We consider the dimensional reduction to D = 3 of four maximal-rank super gravities which preserve minimal supersymmetry in D 11, 7, 5 and 4. Such curious theories were investigated some time ago, and the four-dimensional one corresponds to an N = 1 supergravity with 7 chiral multiplets spanning the seven-disk manifold. Recently, this latter theory provided cosmological models for alpha-attractors, which are based on the disk geometry with possible restrictions on the parameter alpha. A unified picture emerges in D = 3, where the Ehlers group of General Relativity merges with the S-, T- U- and dualities of the D = 4 parent theories.