Higher order Jordan Osserman Pseudo-Riemannian manifolds
  We study the higher order Jacobi operator in pseudo-Riemannian geometry. We exhibit a family of manifolds so that this operator has constant Jordan normal form on the Grassmannian of subspaces of signature (r,s) for certain values of (r,s). These pseudo-Riemannian manifolds are new and non-trivial examples of higher order Osserman manifolds. 
Peter B. Gilkey, Raina Ivanova, and Tan Zhang