Reconstruction and local extensions for twisted group doubles, and permutation orbifolds

Evans, David and Gannon, Terry 2022. Reconstruction and local extensions for twisted group doubles, and permutation orbifolds. Transactions of the American Mathematical Society 375 , pp. 2789-2726. 10.1090/tran/8575

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Abstract

We prove the first nontrivial reconstruction theorem for modular tensor categories: the category associated to any twisted Drinfeld double of any finite group, can be realised as the representation category of a completely rational conformal net. We also show that any twisted double of a solvable group is the category of modules of a completely rational vertex operator algebra. In the process of doing this, we identify the 3-cocycle twist for permutation orbifolds of holomorphic conformal nets: unexpectedly, it can be nontrivial, and depends on the value of the central charge modulo 24. In addition, we determine the branching coefficients of all possible local (conformal) extensions of any finite group orbifold of holomorphic conformal nets, and identify their modular tensor categories. All statements also apply to vertex operator algebras, provided the conjecture holds that finite group orbifolds of holomorphic VOAs are rational, with a category of modules given by a twisted group double.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Mathematics
Subjects:	Q Science > QA Mathematics
Publisher:	American Mathematical Society
ISSN:	0002-9947
Funders:	EPSRC
Related URLs:	https://arxiv.org/abs/1804.11145
Date of First Compliant Deposit:	22 December 2021
Date of Acceptance:	21 October 2021
Last Modified:	14 May 2023 00:33
URI:	https://orca.cardiff.ac.uk/id/eprint/146271

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