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Toroidal Lie algebras and Bogoyavlensky's 2+1-dimensional equation | T. Ikeda
; K. Takasaki
; | Date: |
10 Apr 2000 | Journal: | Internat. Math. Res. Notices 2001, No. 7, 329-369 | Subject: | Exactly Solvable and Integrable Systems; Quantum Algebra | nlin.SI hep-th math.QA | 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. | Source: | arXiv, nlin.SI/0004015 | Services: | Forum | Review | PDF | Favorites |
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