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International Mathematics Research Notices (2000) 2000:741-774, doi:10.1155/S1073792800000416
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Copyright © 2000 Hindawi Publishing Corporation. All rights reserved.

Littlewood-Richardson coefficients via Yang-Baxter equation

Oleg Gleizer and Alexander Postnikov

The purpose of this paper is to present an interpretation for the decomposition of the tensor product of two or more irreducible representations of Formula in terms of a system of quantum particles. Our approach is based on a certain scattering matrix that satisfies a Yang-Baxter type equation. The corresponding piecewise-linear transformations of parameters give a solution to the tetrahedron equation. These transformation maps are naturally related to the dual canonical bases for modules over the quantum enveloping algebra Formula. A byproduct of our construction is an explicit description for the cone of Kashiwara's parametrizations of dual canonical bases. This solves a problem posed by Berenstein and Zelevinsky. We present a graphical interpretation of the scattering matrices in terms of web functions, which are related to honeycombs of Knutson and Tao.


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