Nonstandard Drinfeld-Sokolov reduction

Abstract

Subject to some conditions, the input data for the Drinfeld-Sokolov construction of KdV type hierarchies is a quadruplet $(\A,Λ, d_1, d_0)$, where the $d_i$ are $\mathbb{Z}$-gradations of a loop algebra $\A$ and $Λ\in \A$ is a semisimple element of nonzero $d_1$-grade. A new sufficient condition on the quadruplet under which the construction works is proposed and examples are presented. The proposal relies on splitting the $d_1$-grade zero part of $\A$ into a vector space direct sum of two subalgebras. This permits one to interpret certain Gelfand-Dickey type systems associated with a nonstandard splitting of the algebra of pseudo-differential operators in the Drinfeld-Sokolov framework.

19 pages, LaTeX file

References in corpus (1)

• N=2 KP and KdV hierarchies in extended superspace

Cited by in corpus (2)

• Classical R-matrix theory for bi-Hamiltonian field systems
• A note on the appearance of self-dual Yang-Mills fields in integrable hierarchies