Tensor powers of vector representation of U_q(𝔰𝔩_2) at even roots of unity
arxiv(2024)
摘要
We study the decomposition of tensor powers of two dimensional irreducible
representations of quantum 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 N-th tensor power of two dimensional irreducible
representations, interpret it in terms of lattice paths and find its asymptotic
behavior when N→∞. We also describe the limit of character and
Plancherel measures when N→∞. We consider both U_q(𝔰𝔩_2)
with divided powers and the small quantum sl_2.
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