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由Dirac约化得到的动态r-矩阵及其在仿射李代数上的推广

On dynamical r-matrices obtained from Dirac reduction and their generalizations to affine Lie algebras

L. Fehér, A. Gábor, B. G. Pusztai

摘要:

根据Etingof和Varchenko,经典的动力学杨-巴克斯特方程保证了某些Poisson-李群胚上Poisson括号的相容性。这里注意到,这些泊松流形的狄拉克约化产生了从一对$Ł\subset \A$上的动态r-矩阵到另一对$\K\subset \A$上的动态r-矩阵的映射,其中$\K\subset Ł\subset \A$是一个李代数链,$Ł$允许其约化分解为$Ł=\K+\M$。几个已知的动态r-矩阵自然地出现在这个设置,它的应用提供了新的r-矩阵,太。特别是,我们展示了一个家庭的r-矩阵的动力学变量在于级零子代数的扩展仿射李代数从扭曲的循环代数的基础上任意有限维自对偶李代数。

英文摘要:

According to Etingof and Varchenko, the classical dynamical Yang-Baxter equation is a guarantee for the consistency of the Poisson bracket on certain Poisson-Lie groupoids. Here it is noticed that Dirac reductions of these Poisson manifolds give rise to a mapping from dynamical r-matrices on a pair $Ł\subset \A$ to those on another pair $\K\subset \A$, where $\K\subset Ł\subset \A$ is a chain of Lie algebras for which $Ł$ admits a reductive decomposition as $Ł=\K+\M$. Several known dynamical r-matrices appear naturally in this setting, and its application provides new r-matrices, too. In particular, we exhibit a family of r-matrices for which the dynamical variable lies in the grade zero subalgebra of an extended affine Lie algebra obtained from a twisted loop algebra based on an arbitrary finite dimensional self-dual Lie algebra.

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