Massive three-dimensional supergravity from R plus R2 action in six dimensions

We obtain a three-parameter family of massive N = 1 supergravities in three dimensions from the 3-sphere reduction of an off-shell N = (1, 0) six-dimensional Poincare supergravity that includes a curvature squared invariant. The three-dimensional theory contains an off-shell supergravity multiplet and an on-shell scalar matter multiplet. We then generalise this in three dimensions to an eight-parameter family of supergravities. We also find a duality relationship between the six-dimensional theory and the N = (1, 0) six-dimensional theory obtained through a T-4 reduction of the heterotic string effective action that includes the higher-order terms associated with the supersymmetrisation of the anomaly-cancelling tr(R boolean AND R) term.