The paper reviews the construction of a fiber functor for the Finkelberg-Kazhdan-Lusztig equivalence and discusses its consequences for the structure of weak Hopf algebras and unitarizability of braided fusion categories from conformal field theory.
Constructing equivalences between fusion categories of quantum groups and of vertex operator algebras via quantum gauge groups
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abstract
This paper establishes connections between a problem posed by Doplicher and Roberts in the 1990s regarding construction of quantum gauge groups associated to the category of localized endomorphisms of conformal nets, and a problem by Huang concerning a direct proof of the Finkelberg equivalence theorem. We also unify the treatment of high dimensional algebraic QFT with the low dimensional case, resuming the study of Mack-Schomerus quantum symmetries, for which we previously proved a simplifying Hopf algebra property and studied the unitary structure of our global quantum gauge groups A_W({\mathfrak g}, q) of the WZW model. This program leads us to a solution of Huang's problem in the setting of vertex operator algebras. Building upon our previous results, our approach utilizes a quantum gauge group framework to implement a unitary weak quasi-Hopf algebra structure on the Zhu algebra via a Drinfeld twist and Wenzl's de-quantization continuous curve derived from the unitary coboundary weak Hopf algebra A_W({\mathfrak g}, q) previously associated to the quantum group fusion category. Our construction is of an analytic nature, and was originally inspired by Drinfeld-Kohno theorem for Drinfeld category. Using this framework, in our previous work we established an independent rigid braided tensor structure on the module category of the affine vertex operator algebra $V_{{\mathfrak g}_k}$ at positive integer level, providing a braided tensor equivalence with the modular fusion category of the corresponding quantum group at root of unity for all Lie types. In this paper, for the Lie types $A$, $B$, $C$, $D$, and $G_2$ we completely identify our structure with the Huang-Lepowsky braided tensor structure.
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The braided Doplicher-Roberts program and the Finkelberg-Kazhdan-Lusztig equivalence: A historical perspective, recent progress, and future directions
The paper reviews the construction of a fiber functor for the Finkelberg-Kazhdan-Lusztig equivalence and discusses its consequences for the structure of weak Hopf algebras and unitarizability of braided fusion categories from conformal field theory.