摘要
We consider 2 + 1-dimensional off-shell N = 1 pure supergravity that is constructed from graviton, gravitino and auxiliary field. We show that the R-2 supersymmetric invariant and R-mu nu(2). supersymmetric invariant are expressed as local supersymmetric exact terms up to mass terms for the gravitino. In both cases, the mass parameter is proportional to the off-shell supersymmetric cosmological constant.