Nilpotent action on the KdV variables and 2-dimensional Drinfeld-Sokolov reduction

Abstract

We note that a version ``with spectral parameter'' of the Drinfeld-Sokolov reduction gives a natural mapping from the KdV phase space to the group of loops with values in ${\hat{N}}_{+}/A,{\hat{N}}_{+}$~: affine nilpotent and $A$ principal commutative (or anisotropic Cartan) subgroup~; this mapping is connected to the conserved densities of the hierarchy. We compute the Feigin-Frenkel action of ${\hat{n}}_{+}$ (defined in terms of screening operators) on the conserved densities, in the $s{l}_2$ case.

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