Infinite-dimensional prolongation Lie algebras and multicomponent Landau-Lifshitz systems associated with higher genus curves

Abstract

The Wahlquist-Estabrook prolongation method constructs for some PDEs a Lie algebra that is responsible for Lax pairs and Backlund transformations of certain type. We present some general properties of Wahlquist-Estabrook algebras for (1+1)-dimensional evolution PDEs and compute this algebra for the n-component Landau-Lifshitz system of Golubchik and Sokolov for any $n\ge 3$. We prove that the resulting algebra is isomorphic to the direct sum of a 2-dimensional abelian Lie algebra and an infinite-dimensional Lie algebra L(n) of certain matrix-valued functions on an algebraic curve of genus $1+(n-3)2^{n-2}$. This curve was used by Golubchik, Sokolov, Skrypnyk, Holod in constructions of Lax pairs. Also, we find a presentation for the algebra L(n) in terms of a finite number of generators and relations. These results help to obtain a partial answer to the problem of classification of multicomponent Landau-Lifshitz systems with respect to Backlund transformations. Furthermore, we construct a family of integrable evolution PDEs that are connected with the n-component Landau-Lifshitz system by Miura type transformations parametrized by the above-mentioned curve. Some solutions of these PDEs are described.

30 pages; v2: minor changes

References in corpus (1)

• Generalized Landau-Lifshitz systems and Lie algebras associated with higher genus curves

Cited by in corpus (4)

• Lie algebras responsible for zero-curvature representations of scalar evolution equations
• On Lie algebras responsible for integrability of (1+1)-dimensional scalar evolution PDEs
• Higher jet prolongation Lie algebras and Backlund transformations for (1+1)-dimensional PDEs
• On Lie algebras responsible for zero-curvature representations of multicomponent (1+1)-dimensional evolution PDEs