Cleft Extensions and Quotients of Twisted Quantum Doubles
Cleft Extensions and Quotients of Twisted Quantum Doubles
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扭曲量子双体的裂口延伸和商
DOI:
10.1007/978-3-319-09804-3_11
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
S. Ng
中科院分区:
文献类型:
--
作者:
G. Mason;S. Ng
Given a pair of finite groups F, G and a normalized 3-cocycle \(\omega\) of G, where F acts on G as automorphisms, we consider quasi-Hopf algebras defined as a cleft extension \(\mathbb{k}_{\omega }^{G}\#_{c}\,\mathbb{k}F\) where c denotes some suitable cohomological data. When \(F \rightarrow \overline{F}:= F/A\) is a quotient of F by a central subgroup A acting trivially on G, we give necessary and sufficient conditions for the existence of a surjection of quasi-Hopf algebras and cleft extensions of the type \(\mathbb{k}_{\omega }^{G}\#_{c}\,\mathbb{k}F \rightarrow \mathbb{k}_{\omega }^{G}\#_{\overline{c}}\,\mathbb{k}\overline{F}\). Our construction is particularly natural when F = G acts on G by conjugation, and \(\mathbb{k}_{\omega }^{G}\#_{c}\mathbb{k}G\) is a twisted quantum double D ω (G). In this case, we give necessary and sufficient conditions that Rep(\(\mathbb{k}_{\omega }^{G}\#_{\overline{c}}\,\mathbb{k}\overline{G}\)) is a modular tensor category.