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Schur Polynomials and The Yang-Baxter Equation

Author(s)
Brubaker, Benjamin Brock; Bump, Daniel; Friedberg, Solomon
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Abstract
We describe a parametrized Yang-Baxter equation with nonabelian parameter group. That is, we show that there is an injective map gR(g) from GL(2C)GL(1C) to End (VV) , where V is a two-dimensional vector space such that if ghG then R 12(g)R 13(gh) R 23(h) = R 23(h) R 13(gh)R 12(g). Here R i j denotes R applied to the i, j components of VVV . The image of this map consists of matrices whose nonzero coefficients a 1, a 2, b 1, b 2, c 1, c 2 are the Boltzmann weights for the non-field-free six-vertex model, constrained to satisfy a 1 a 2 + b 1 b 2 − c 1 c 2 = 0. This is the exact center of the disordered regime, and is contained within the free fermionic eight-vertex models of Fan and Wu. As an application, we show that with boundary conditions corresponding to integer partitions λ, the six-vertex model is exactly solvable and equal to a Schur polynomial sλ times a deformation of the Weyl denominator. This generalizes and gives a new proof of results of Tokuyama and Hamel and King.
Date issued
2011-05
URI
http://hdl.handle.net/1721.1/70528
Department
Massachusetts Institute of Technology. Department of Mathematics; Massachusetts Institute of Technology. Department of Mathematics
Journal
Communications in Mathematical Physics
Publisher
Springer-Verlag
Citation
Brubaker, Ben, Daniel Bump, and Solomon Friedberg. “Schur Polynomials and The Yang-Baxter Equation.” Communications in Mathematical Physics 308.2 (2011): 281–301. Web.
Version: Author's final manuscript
ISSN
0010-3616
1432-0916

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