Discrete Miura Opers and Solutions of the Bethe Ansatz Equations

Details Discrete Miura Opers and Solutions of the Bethe Ansatz Equations Discrete Miura Opers and Solutions of the Bethe Ansatz Equations

2004-01-14

arxiv.org/abs/math/0401137v2

Mathematics

Quantum Algebra

Latex, 26 pages

Scientific paper

10.1007/s00220-005-1288-7

Solutions of the Bethe ansatz equations associated to the XXX model of a simple Lie algebra come in families called the populations. We prove that a population is isomorphic to the flag variety of the Langlands dual Lie algebra. The proof is based on the correspondence between the solutions of the Bethe ansatz equations and special difference operators which we call the discrete Miura opers. The notion of a discrete Miura oper is one of the main results of the paper. For a discrete Miura oper D, associated to a point of a population, we show that all solutions of the difference equation DY=0 are rational functions, and the solutions can be written explicitly in terms of points composing the population.

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