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Contractions and deformations of quasiclassical Lie algebras preserving a nondegenerate quadratic Casimir operator

机译:保留一个非退化二次卡西米尔算子的拟经典李代数的压缩和变形

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摘要

By means of contractions of Lie algebras, we obtain new classes of indecomposable quasiclassical Lie algebras that satisfy the Yang-Baxter equations in its reformulation in terms of triple products. These algebras are shown to arise naturally from noncompact real simple algebras with nonsimple complexification, where we impose that a nondegenerate quadratic Casimir operator is preserved by the limiting process. We further consider the converse problem and obtain sufficient conditions on integrable cocycles of quasiclassical Lie algebras in order to preserve nondegenerate quadratic Casimir operators by the associated linear deformations.
机译:通过李代数的压缩,我们获得了新的不可分解的拟经典李代数,这些代在三重乘积的形式上满足了杨-巴克斯特方程。这些代数显示为自然地来自具有非简单复杂性的非紧实单简单代数,在这里我们强加非退化二次Casimir算子通过限制过程得以保留。我们进一步考虑逆问题,并在准经典李代数的可积余代数上获得足够的条件,以通过相关的线性变形来保留非退化的二次卡西米尔算子。

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