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arXiv 1307.6485math-phgr-qchep-thmath.MP
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经典r-矩阵的半对偶化

Classical r-matrices via semidualisation

Prince K Osei, Bernd J Schroers

摘要:

研究了李代数的双交叉和分解与其半对偶的经典r-矩阵之间的相互作用。对于一类可以通过广义复化过程得到的李代数,我们推导出半对偶李双代数的经典r-矩阵的表达式,其中的数据决定了原李代数的分解。应用于局部等距李代数产生的三维重力,分解和semidualisation产生的主要类的非平凡r-矩阵的欧几里德和庞加莱集团在三维空间。此外,该构造将r-矩阵与三维实李代数的Bianchi分类联系起来。

英文摘要:

We study the interplay between double cross sum decompositions of a given Lie algebra and classical r-matrices for its semidual. For a class of Lie algebras which can be obtained by a process of generalised complexification we derive an expression for classical r-matrices of the semidual Lie bialgebra in terms of the data which determines the decomposition of the original Lie algebra. Applied to the local isometry Lie algebras arising in three-dimensional gravity, decomposition and semidualisation yields the main class of non-trivial r-matrices for the Euclidean and Poincare group in three dimensions. In addition, the construction links the r-matrices with the Bianchi classification of three dimensional real Lie algebras.

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