Abstract
The main result is that the category of ordinary modules of an affine vertex operator algebra of a simply laced Lie algebra at admissible level is rigid and thus a braided fusion category. If the level satisfies a certain coprime property then it is even a modular tensor category. In all cases open Hopf links coincide with the corresponding normalized S-matrix entries of torus one-point functions. This is interpreted as a Verlinde formula beyond rational vertex operator algebras. A preparatory Theorem is a convenient formula for the fusion rules of rational principal W-algebras of any type.
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Acknowledgements
I am very grateful to Terry Gannon for many discussions on related issues and to Jinwei Yang, Yi-Zhi Huang, Andrew Linshaw, Tomoyuki Arakawa, Shashank Kanade and Robert McRae for the collaborations on the works that were needed for this paper. I am supported by NSERC \(\#\)RES0020460.
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