Nonabelian generalized Lax pairs, the classical Yang-Baxter equation and PostLie algebras

Details Nonabelian generalized Lax pairs, the classical Yang-Baxter equation and PostLie algebras Nonabelian generalized Lax pairs, the classical Yang-Baxter equation and PostLie algebras

2009-10-17

arxiv.org/abs/0910.3262v1

Comm. Math. Phys. (2010)

Physics

Mathematical Physics

38 pages

Scientific paper

We generalize the classical study of (generalized) Lax pairs and the related $O$-operators and the (modified) classical Yang-Baxter equation by introducing the concepts of nonabelian generalized Lax pairs, extended $\calo$-operators and the extended classical Yang-Baxter equation. We study in this context the nonabelian generalized $r$-matrix ansatz and the related double Lie algebra structures. Relationship between extended $O$-operators and the extended classical Yang-Baxter equation is established, especially for self-dual Lie algebras. This relationship allows us to obtain explicit description of the Manin triples for a new class of Lie bialgebras. Furthermore, we show that a natural structure of PostLie algebra is behind $O$-operators and fits in a setup of triple Lie algebra that produces self-dual nonabelian generalized Lax pairs.

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