# A Kazhdan–Lusztig Correspondence for L-32(sl3)

Creutzig T, Ridout D, Rupert M (2023)

**Publication Type:** Journal article

**Publication year:** 2023

### Journal

**Book Volume:** 400

**Pages Range:** 639-682

**Journal Issue:** 1

**DOI:** 10.1007/s00220-022-04602-8

### Abstract

The abelian and monoidal structure of the category of smooth weight modules over a non-integrable affine vertex algebra of rank greater than one is an interesting, difficult and essentially wide open problem. Even conjectures are lacking. This work details and tests such a conjecture for L-32(sl3) via a logarithmic Kazhdan–Lusztig correspondence. We first investigate the representation theory of U¯iH(sl3), the unrolled restricted quantum group of sl3 at fourth root of unity. In particular, we analyse its finite-dimensional weight category, determining Loewy diagrams for all projective indecomposables and decomposing all tensor products of irreducibles. Our motivation is that this category is conjecturally braided tensor equivalent to a category of WA20(2)-modules. Here, WA20(2) is an orbifold of the octuplet vertex algebra WA2(2) of Semikhatov, the latter being the natural sl3-analogue of the well known triplet algebra. Moreover, WA20(2) is the parafermionic coset of the affine vertex algebra L-32(sl3). We formulate an explicit conjecture relating the representation theory of WA20(2) and U¯iH(sl3) and work out the resulting structures of the corresponding L-32(sl3)-modules. In particular, we obtain conjectural Loewy diagrams for the latter’s projective indecomposables and decompositions for the fusion products of its irreducibles. These products coincide with those recently computed via Verlinde’s formula. Finally, we give analogous results for WA2(2).

### Involved external institutions

### How to cite

**APA:**

Creutzig, T., Ridout, D., & Rupert, M. (2023). A Kazhdan–Lusztig Correspondence for L-32(sl3). *Communications in Mathematical Physics*, *400*(1), 639-682. https://doi.org/10.1007/s00220-022-04602-8

**MLA:**

Creutzig, Thomas, David Ridout, and Matthew Rupert. "A Kazhdan–Lusztig Correspondence for L-32(sl3)." *Communications in Mathematical Physics* 400.1 (2023): 639-682.

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