On the classical $W_N^{(l)}$ algebras

Details On the classical $W_N^{(l)}$ algebras On the classical $W_N^{(l)}$ algebras

1991-11-22

arxiv.org/abs/hep-th/9111046v1

Int. J. Mod. Phys. A7 (1992) 6053-6080

Physics

High Energy Physics

High Energy Physics - Theory

28 pages

Scientific paper

We analyze the W_N^l algebras according to their conjectured realization as the second Hamiltonian structure of the integrable hierarchy resulting from the interchange of x and t in the l^{th} flow of the sl(N) KdV hierarchy. The W_4^3 algebra is derived explicitly along these lines, thus providing further support for the conjecture. This algebra is found to be equivalent to that obtained by the method of Hamiltonian reduction. Furthermore, its twisted version reproduces the algebra associated to a certain non-principal embedding of sl(2) into sl(4), or equivalently, the u(2) quasi-superconformal algebra. The general aspects of the W_N^l algebras are also presented.

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