Generalizations of the Scorza correspondence
We study generalizations of the Scorza correspondence associated with a general $(C,η)$ in the moduli space of even spin curves $S_g^+$. We first give a new proof of the smoothness of the classical Scorza curve, originally established by Farkas-Verra. We then introduce higher order analogues of the Scorza correspondence and investigate their geometry. In particular, we compute their classes in the Néron-Severi group and study their singularities and genera. Finally, we consider a higher-dimensional version of the construction and focus on the threefold case, where we describe its class and prove a smoothness result outside a naturally defined degeneracy locus.
math.AG↗