Non-local charges, Zm gradings and coset space actions
arXiv:hep-th/0503008 · doi:10.1016/j.physletb.2005.10.090
Abstract
The construction of flat currents, and hence conserved non-local charges, for the superstring on AdS_5 x S^5 is generalised. It is shown that such currents exist for sigma-model type actions on all coset (super-)spaces G/H in which, at the level of the Lie algebras, h is the grade-zero subspace of a Zm grading of g. This is true for an essentially unique choice of the Wess-Zumino term, which is determined.
18 pages, LaTeX, extended discussion in section 2, references added