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Toroidal Lie algebras and Bogoyavlensky's 2+1-dimensional equation

T. Ikeda·K. Takasaki
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Abstract

We introduce an extension of the \ell-reduced KP hierarchy, which we call the \ell-Bogoyavlensky hierarchy. Bogoyavlensky's 2+1-dimensional extension of the KdV equation is the lowest equation of the hierarchy in case of \ell=2. We present a group-theoretic characterization of this hierarchy on the basis of the 2-toroidal Lie algebra sl_\ell^{tor}. This reproduces essentially the same Hirota bilinear equations as those recently introduced by Billig and Iohara et al. We can further derive these Hirota bilinear equation from a Lax formalism of the hierarchy.This Lax formalism also enables us to construct a family of special solutions that generalize the breaking soliton solutions of Bogoyavlensky. These solutions contain the N-soliton solutions, which are usually constructed by use of vertex operators.

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T. Ikeda, K. Takasaki. 2000-09-05. Toroidal Lie algebras and Bogoyavlensky's 2+1-dimensional equation. https://arxiv.org/abs/nlin/0004015

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