The representation-category equivalence for loop group nets

Let GG be the compact, simply connected Lie group and kk the level appearing in the representation categories. Let Rep(\cAG,k)\mathrm{Rep}(\cA_{G,k}) be the category of representations of the conformal net, let Vecf\mathsf{Vec}_{\mathrm{f}} be the category of finite-dimensional vector spaces, and let Hilb\mathsf{Hilb} be the category of Hilbert spaces and bounded linear maps. Write Repfk(\g^)\mathrm{Rep}^k_{\mathrm{f}}(\hat \g) for the category of finite direct sums of irreducible level-kk integrable positive-energy representations of the affine Lie algebra \g^\hat \g. The representation-category equivalence conjecture. There is a natural equivalence of categories

Rep(\cAG,k)Repfk(\g^)VecfHilb.\mathrm{Rep}(\cA_{G,k})\cong \mathrm{Rep}^k_{\mathrm{f}}(\hat \g)\otimes_{\mathsf{Vec}_{\mathrm{f}}}\mathsf{Hilb}.

This is intended to identify all representations of the conformal net with Hilbert-space completions of finite sums of irreducible affine Lie algebra representations, excluding representations that are not direct sums of irreducibles. Equivalently, via the comparison functor to loop-group representations, it asserts that every level-kk positive-energy representation is locally normal.

Sources & referencesView supporting material

Primary source

Andre Henriques, “Loop groups and diffeomorphism groups of the circle as colimits”, arXiv:1706.08471 (2019).

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