Abstract
It is known that the asymptotic density of states of a 2d CFT in an irreducible representation ρ of a finite symmetry group G is proportional to (dim ρ)2. We show how this statement can be generalized when the symmetry can be non-invertible and is described by a fusion category \( \mathcal{C} \). Along the way, we explain what plays the role of a representation of a group in the case of a fusion category symmetry; the answer to this question is already available in the broader mathematical physics literature but not yet widely known in hep-th. This understanding immediately implies a selection rule on the correlation functions, and also allows us to derive the asymptotic density.
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Lin, YH., Okada, M., Seifnashri, S. et al. Asymptotic density of states in 2d CFTs with non-invertible symmetries. J. High Energ. Phys. 2023, 94 (2023). https://doi.org/10.1007/JHEP03(2023)094
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DOI: https://doi.org/10.1007/JHEP03(2023)094