Regularity of Solutions of the Nonlinear Sigma Model with Gravitino
  We propose a geometric setup to study analytic aspects of a variant of the super symmetric two-dimensional nonlinear sigma model. This functional extends the functional of Dirac-harmonic maps by gravitino fields. The system of Euler--Lagrange equations of the two-dimensional nonlinear sigma model with gravitino is calculated explicitly. The gravitino terms pose additional analytic difficulties to show smoothness of its weak solutions which are overcome using Rivi\`ere's regularity theory and Riesz potential theory. 
J\"urgen Jost, Enno Ke{\ss}ler, J\"urgen Tolksdorf, Ruijun Wu,   Miaomiao Zhu
math.DG math.AP