Title | Adler-Gelfand-Dickey approach to classical W-algebras within the theory of Poisson vertex algebras |
Publication Type | Journal Article |
Year of Publication | 2014 |
Authors | De Sole, A, Kac, VG, Valeri, D |
Abstract | We put the Adler-Gelfand-Dickey approach to classical W-algebras in the framework of Poisson vertex algebras. We show how to recover the bi-Poisson structure of the KP hierarchy, together with its generalizations and reduction to the N-th KdV hierarchy, using the formal distribution calculus and the lambda-bracket formalism. We apply the Lenard-Magri scheme to prove integrability of the corresponding hierarchies. We also give a simple proof of a theorem of Kupershmidt and Wilson in this framework. Based on this approach, we generalize all these results to the matrix case. In particular, we find (non-local) bi-Poisson structures of the matrix KP and the matrix N-th KdV hierarchies, and we prove integrability of the N-th matrix KdV hierarchy. |
URL | http://hdl.handle.net/1963/7242 |