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arXiv · 2611.09016

Twisted Verlinde Formula for Finite Cyclic Orbifolds of Vertex Operator Algebras

Wenbin Jiang·Jiancai Sun
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Abstract

Let $V$ be a simple, rational, $C_2$-cofinite and self-dual vertex operator algebra of CFT type, and let $G$ be a finite cyclic automorphism group of $V$. We establish a twisted Verlinde formula for cyclic groups of arbitrary finite order, expressing fusion coefficients among twisted $V$-modules in terms of the $S$-matrix in the orbifold theory. As an application, we compute fusion rules among twisted modules for the permutation orbifold $\left(V^{\otimes k}\right)^{\langle g\rangle}$ associated with a $k$-cycle $g=(1\,2\,\cdots\,k)$.

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Wenbin Jiang, Jiancai Sun. 2026-11-06. Twisted Verlinde Formula for Finite Cyclic Orbifolds of Vertex Operator Algebras. https://arxiv.org/abs/2611.09016

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