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• W2616334666 abstract "Let $V$ be a vertex operator algebra with a category $mathcal{C}$ of (generalized) modules that has vertex tensor category structure, and thus braided tensor category structure, and let $A$ be a vertex operator (super)algebra extension of $V$. We employ tensor categories to study untwisted (also called local) $A$-modules in $mathcal{C}$, using results of Huang-Kirillov-Lepowsky showing that $A$ is a (super)algebra object in $mathcal{C}$ and that generalized $A$-modules in $mathcal{C}$ correspond exactly to local modules for the corresponding (super)algebra object. Both categories, of local modules for a $mathcal{C}$-algebra and (under suitable conditions) of generalized $A$-modules, have natural braided monoidal category structure, given in the first case by Pareigis and Kirillov-Ostrik and in the second case by Huang-Lepowsky-Zhang. Our main result is that the Huang-Kirillov-Lepowsky isomorphism of categories between local (super)algebra modules and extended vertex operator (super)algebra modules is also an isomorphism of braided monoidal (super)categories. Using this result, we show that induction from a suitable subcategory of $V$-modules to $A$-modules is a vertex tensor functor. We give two applications. First, we derive Verlinde formulae for regular vertex operator superalgebras and regular $(1/2)mathbb{Z}$-graded vertex operator algebras by realizing them as (super)algebra objects in the vertex tensor categories of their even and $mathbb{Z}$-graded components, respectively. Second, we analyze parafermionic cosets $C=mathrm{Com}(V_L,V)$ where $L$ is a positive definite even lattice and $V$ is regular. If the category of either $V$-modules or $C$-modules is understood, then our results classify all inequivalent simple modules for the other algebra and determine their fusion rules and modular character transformations. We illustrate both directions with several examples." @default.
• W2616334666 created "2017-05-26" @default.
• W2616334666 creator A5030450639 @default.
• W2616334666 creator A5078321658 @default.
• W2616334666 creator A5089933457 @default.
• W2616334666 date "2017-05-14" @default.
• W2616334666 modified "2023-09-27" @default.
• W2616334666 title "Tensor categories for vertex operator superalgebra extensions" @default.
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• W2616334666 hasPublicationYear "2017" @default.
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