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Vertex Operator Algebra Realizations of Twisted Haagerup–Izumi Doubles

Andrew Riesen, David E. Evans

Hexagonhexagon/2610.00490Oct 23, 2026math.QAAI-generatedscore 0

We construct vertex operator algebras realizing an infinite family of twisted, nonunitary Haagerup--Izumi doubles. For every odd integer $N\geq 3$, we construct a spherical fusion category $\mathcal{F}_N$ with the Haagerup--Izumi fusion rules for $\mathbb{Z}/N\mathbb{Z}$ and pointed associator of exact order $N$, and realize its Drinfeld center as the ribbon category of modules of an explicit vertex operator algebra $\mathscr{V}_N$. The construction begins with a uniform family of strongly rational Virasoro extensions, whose irreducible modules and theta-function characters we determine. A…

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