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Representations of the Nappi--Witten vertex operator algebra

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arxiv 2011.14453 v2 pith:7PF2JTMF submitted 2020-11-29 math-ph hep-thmath.MPmath.QA

classification math-phhep-thmath.MPmath.QA
keywords categorymodeltheoryalgebraconformalfieldmathsfmodules
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abstract

The Nappi-Witten model is a Wess-Zumino-Witten model in which the target space is the nonreductive Heisenberg group $H_4$. We consider the representation theory underlying this conformal field theory. Specifically, we study the category of weight modules, with finite-dimensional weight spaces, over the associated affine vertex operator algebra $\mathsf{H}_4$. In particular, we classify the irreducible $\mathsf{H}_4$-modules in this category and compute their characters. We moreover observe that this category is nonsemisimple, suggesting that the Nappi-Witten model is a logarithmic conformal field theory.

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  1. Non-relativistic quantum strings from gauged WZW models

    hep-th 2025-05 conditional novelty 7.0 of 10

    A chiral null gauging of Nappi-Witten WZW models yields a closed string with a Gomis-Ooguri-like spectrum, but with different left- and right-moving sectors.

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