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Article
On the Gauge Equivalence of Twisted Quantum Doubles of Elementary Abelian and Extra-Special 2-Groups
Journal of Algebra
(2007)
Abstract
We establish braided tensor equivalences among module categories over the twisted quantum double of a finite group defined by an extension of a group H by an abelian group, with 3-cocycle inflated from a 3-cocycle on H. We also prove that the canonical ribbon structure of the module category of any twisted quantum double of a finite group is preserved by braided tensor equivalences. We give two main applications: first, if G is an extra-special 2-group of width at least 2, we show that the quantum double of G twisted by a 3-cocycle w is gauge equivalent to a twisted quantum double of an elementary abelian 2-group if, and only if, w^2 is trivial; second, we discuss the gauge equivalence classes of twisted quantum doubles of groups of order 8, and classify the braided tensor equivalence classes of these quasi-triangular quasi-bialgebras. It turns out that there are exactly 20 such equivalence classes.
Keywords
- twisted quantum double,
- group cohomology,
- Frobenius–Schur indicator and exponent,
- Quasi-Hopf algebra,
- braided tensor category
Disciplines
Publication Date
June 1, 2007
DOI
10.1016/j.jalgebra.2006.10.022
Citation Information
Christopher Goff, Geoffrey Mason and Siu-Hung Ng. "On the Gauge Equivalence of Twisted Quantum Doubles of Elementary Abelian and Extra-Special 2-Groups" Journal of Algebra Vol. 312 Iss. 2 (2007) p. 849 - 875 ISSN: 0021-8693 Available at: http://works.bepress.com/chris-goff/3/
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