Toda Solitons: a Relation between Dressing transformations and Vertex Operators

Affine Toda equations based on simple Lie algebras arise by imposing zero curvature condition on a Lax connection which belongs to the corresponding loop Lie algebra in the principal gradation. In the particular case of A (1) n Toda models, we exploit the symmetry of the underlying linear problem to calculate the dressing group element which generates arbitrary N -soliton solution from the vacuum. Starting from this result we recover the vertex operator representation of the soliton tau functions. Talk given at the iV International Conference on Non Associative Lie Algebra and its Applications, University of São Paulo, July 19–20, 1998, São Paulo, Brazil E–mail address [email protected] E–mail address [email protected]