Fusion-rule conjecture for a family of rational lisse vertex algebras

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For each positive integer mm, let r=3m−1r=3m-1 and let [i][i] for i=0,1,…,ri=0,1,\ldots,r denote the irreducible modules of a rational lisse vertex algebra of central charge

c=13−6(m+1m).c=13-6\left(m+\frac{1}{m}\right).

Fusion-rule conjecture. There exists such a rational lisse vertex algebra whose irreducible modules satisfy

[i]⊠[j]≅⨁∣i−j∣≤k≤min⁡{i+j,r−i−j}k≡i+jmod2[k].[i]\boxtimes[j]\cong\bigoplus_{\substack{|i-j|\leq k\leq\min\{i+j,r-i-j\}\\ k\equiv i+j\bmod 2}}[k].

The claim is proposed from explicit low-rank computations of fusion rings for type DnD_n; no proof or disproof is given in the supplied text.

References

Primary source

Tomoyuki Arakawa and Jethro van Ekeren, “Rationality and Fusion Rules of Exceptional W-Algebras”, arXiv:1905.11473 (2021).

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