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arXiv 0708.3191math.RT
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李超代数II的上同调与支撑簇

Cohomology and Support Varieties for Lie Superalgebras II

Brian D. Boe, Jonathan R. Kujawa, Daniel K. Nakano

摘要:

在\cite{BKN}的作者发起了一项研究的表示论的经典李超代数通过上同调的方法。构造了检测子代数,发展了支撑簇理论。证明了检测子代数的维数与李超代数的亏度一致,并证明了单超模的支撑簇的维数与超模的紧度一致.本文计算了I型李超代数的Kac超模和$\mathfrak{gl}(m|n)$的单超模的支撑簇。后一个结果验证了我们早先对$\mathfrak{gl}(m|n)$的猜想。在我们的研究中,我们还描绘了类型I与类型II经典李超代数之间的几个主要差异。最后,利用Clifford超代数的支撑簇和表示理论,进一步明确了实性、亏度和超维数之间的联系。

英文摘要:

In \cite{BKN} the authors initiated a study of the representation theory of classical Lie superalgebras via a cohomological approach. Detecting subalgebras were constructed and a theory of support varieties was developed. The dimension of a detecting subalgebra coincides with the defect of the Lie superalgebra and the dimension of the support variety for a simple supermodule was conjectured to equal the atypicality of the supermodule. In this paper the authors compute the support varieties for Kac supermodules for Type I Lie superalgebras and the simple supermodules for $\mathfrak{gl}(m|n)$. The latter result verifies our earlier conjecture for $\mathfrak{gl}(m|n)$. In our investigation we also delineate several of the major differences between Type I versus Type II classical Lie superalgebras. Finally, the connection between atypicality, defect and superdimension is made more precise by using the theory of support varieties and representations of Clifford superalgebras.

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