Characters and relations among SW(3/2,2) algebras

The SW(3/2,2) current algebras come in two discrete series indexed by central charge, with the chiral algebra of a supersymmetric sigma model on a Spin}(7) manifold as a special case. The unitary representations of these algebras were classified by Gepner and Noyvert, and we use their results to perform an analysis of null descendants and compute the characters for every representation. We obtain threshold relations between the characters of discrete representations and those with continuous conformal weights. Modular transformations are discussed, and we show that the continuous characters can be written as bilinear combinations of characters for consecutive minimal models.