Nucleon-nucleon interaction in the Skyrme model
  We consider the interaction of two skyrmions in the framework of the sudden approximation. The widely used product ansatz is investigated. Its failure in reproducing an attractive central potential is associated with terms that violate G-parity. We discuss the construction of alternative ans\"atze and identify a plausible solution to the problem. 
Isabela P. Cavalcante, Manoel R. Robilotta