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

TL;DR

This paper develops matrix-valued generalizations of elliptic integrable tops using R-matrix formalism, linking them to Painleve VI equations and noncommutative algebra, expanding the scope of integrable systems.

Contribution

It introduces matrix extensions of elliptic integrable tops and connects them to Painleve VI equations through R-matrix and associative Yang-Baxter frameworks.

Findings

Matrix extensions require additional constraints.

Matrix-valued variables can be elements of noncommutative algebra.

Constructed matrix models include elliptic Gaudin models.

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 Painlev\'e 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.