Geometric Complexity Theory: Nonstandard Quantum Group for the Kronecker Problem (Memoirs of the American Mathematical Society) by Jonah Blasiak (PDF)

Description

The Kronecker coefficient $glambda mu nu$ is the multiplicity of the $GL(V)times GL(W)$-irreducible $Vlambda otimes Wmu$ in the restriction of the $GL(X)$-irreducible $Xnu$ via the natural map $GL(V)times GL(W) to GL(V otimes W)$, where $V, W$ are $mathbbC$-vector spaces and $X = V otimes W$. A fundamental open problem in algebraic combinatorics is to find a positive combinatorial formula for these coefficients.The authors construct two quantum objects for this problem, which they call the nonstandard quantum group and nonstandard Hecke algebra. They show that the nonstandard quantum group has a compact real form and its representations are completely reducible, that the nonstandard Hecke algebra is semisimple, and that they satisfy an analog of quantum Schur-Weyl duality.

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