THE Hn SIGMA-MODELS AND SELF-DUAL SU(n) YANG-MILLS FIELDS IN FOUR-DIMENSIONAL EUCLIDEAN SPACE
The Hn σ-models. i.e., non-linear σ-models taking values on the symmetric coset space SL(n,c)/SU(n), both in two-dimensional and four-dimensional Euclidean space, are formulated. The relations with self-dual SU(n) Yang-Mills fields are also discussed.