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Tensor powers of vector representation of $U_q(\mathfrak{sl}_2)$ at even roots of unity

Representation Theory 2024-07-30 v2

Abstract

We study the decomposition of tensor powers of two dimensional irreducible representations of quantum sl2\mathfrak{sl}_2 at even roots of unity into direct sums of tilting modules. We derive a combinatorial formula for multiplicity of tilting modules in the NN-th tensor power of two dimensional irreducible representations, interpret it in terms of lattice paths and find its asymptotic behavior when NN\to\infty. We also describe the limit of character and Plancherel measures when NN\to\infty. We consider both Uq(sl2)U_q(\mathfrak{sl}_2) with divided powers and the small quantum sl2sl_2.

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Cite

@article{arxiv.2404.03933,
  title  = {Tensor powers of vector representation of $U_q(\mathfrak{sl}_2)$ at even roots of unity},
  author = {Anna Lachowska and Olga Postnova and Nicolai Reshetikhin and Dmitry Solovyev},
  journal= {arXiv preprint arXiv:2404.03933},
  year   = {2024}
}

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43 pages