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arXiv 1010.3765math-phhep-thmath.MP
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李超代数的一类二次变形

A class of quadratic deformations of Lie superalgebras

Peter Jarvis, Gerd Rudolph, Luke Yates

摘要:

我们研究了某些Z_2-分次的2次有限维多项式代数,它们是李超代数的一类特殊变形,我们称之为二次李超代数。从形式定义出发,讨论了Koszul性质下的广义Jacobi关系,并给出了PBW基定理的一个证明。我们给出了几个具体的例子,二次李超代数的低维情况下,并讨论了它们的结构常数方面的“I型”类。我们推导出等价的Kac模块建设的典型和非典型的模块,以及相关的直接建设的不可约模块由于古尔德。我们详细研究了李超代数sl(n/1)的二次推广gl_2(n/1).我们在第一层给出了一般的非典型性条件,并给出了一类Kac模的零步和一步非典型模的分析。

英文摘要:

We study certain Z_2-graded, finite-dimensional polynomial algebras of degree 2 which are a special class of deformations of Lie superalgebras, which we call quadratic Lie superalgebras. Starting from the formal definition, we discuss the generalised Jacobi relations in the context of the Koszul property, and give a proof of the PBW basis theorem. We give several concrete examples of quadratic Lie superalgebras for low dimensional cases, and discuss aspects of their structure constants for the `type I' class. We derive the equivalent of the Kac module construction for typical and atypical modules, and a related direct construction of irreducible modules due to Gould. We investigate in detail one specific case, the quadratic generalisation gl_2(n/1) of the Lie superalgebra sl(n/1). We formulate the general atypicality conditions at level 1, and present an analysis of zero-and one-step atypical modules for a certain family of Kac modules.

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