The Representation Ring of the Twisted Quantum Double of a Finite Group

The Representation Ring of the Twisted Quantum Double of a Finite Group
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有限群扭曲量子双体的表示环

DOI:
10.4153/cjm-1996-070-6
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发表时间:
1996
期刊:
Canadian Journal of Mathematics - Journal Canadien de Mathematiques
影响因子:
--
通讯作者:
S. Witherspoon
S. Witherspoon
中科院分区:
--
文献类型:
--
作者:
S. Witherspoon

文献摘要

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本文给出了有限群的扭量子偶模的Grothendieck环与中心化子群的扭群代数的中心的乘积之间的同构。因此,这个Grothendieck环是半单的。另一个后果是一个公式的字符,这个环的表示扭曲群代数的中心化子。
Abstract We provide an isomorphism between the Grothendieck ring of modules of the twisted quantum double of a finite group, and a product of centres of twisted group algebras of centralizer subgroups. It follows that this Grothendieck ring is semisimple. Another consequence is a formula for the characters of this ring in terms of representations of twisted group algebras of centralizer subgroups.