Noncommutative extensions of elliptic integrable Euler-Arnold tops and Painleve VI equation

Abstract

In this paper we suggest generalizations of elliptic integrable tops to matrix-valued variables. Our consideration is based on $R$-matrix description which provides Lax pairs in terms of quantum and classical $R$-matrices. First, we prove that for relativistic (and non-relativistic) tops such Lax pairs with spectral parameter follow from the associative Yang-Baxter equation and its degenerations. Then we proceed to matrix extensions of the models and find out that some additional constraints are required for their construction. We describe a matrix version of ${\mathbb{Z}}_2$ reduced elliptic top and verify that the latter constraints are fulfilled in this case. The construction of matrix extensions is naturally generalized to the monodromy preserving equation. In this way we get matrix extensions of the Painlevé VI equation and its multidimensional analogues written in the form of non-autonomous elliptic tops. Finally, it is mentioned that the matrix valued variables can be replaced by elements of noncommutative associative algebra. In the end of the paper we also describe special elliptic Gaudin models which can be considered as matrix extensions of the (${\mathbb{Z}}_2$ reduced) elliptic top.

26 pages, minor corrections

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• Relativistic elliptic matrix tops and finite Fourier transformations
• Lax equations for relativistic $\mathrm{GL}(NM,\mathbb{C})$ Gaudin models on elliptic curve
• Relativistic interacting integrable elliptic tops
• Integrable System of Generalized Relativistic Interacting Tops
• Gauge equivalence between 1+1 rational Calogero-Moser field theory and higher rank Landau-Lifshitz equation
• Gauge equivalence of 1+1 Calogero-Moser-Sutherland field theory and higher rank trigonometric Landau-Lifshitz model
• Classical integrable spin chains of Landau-Lifshitz type from R-matrix identities
• Higher rank generalization of 11-vertex rational R-matrix: IRF-Vertex relations and associative Yang-Baxter equation
• Multi-pole extension for elliptic models of interacting integrable tops