Abstract
Recent analyses of classical integrable structures in quantum integrable models solved by various versions of the Bethe ansatz are reviewed. Similarities between elements of quantum and classical theories of integrable systems are discussed. Some key ideas in quantum theory, now standard in the quantum inverse scattering method, are identified with typical constructions in classical soliton theory. Functional relations for quantum transfer matrices become the classical Hirota bilinear difference equation; solving this classical equation gives all the basic results for the spectral properties of quantum systems. Vice versa, typical Bethe ansatz formulas under certain boundary conditions yield solutions of this classical equation. The Baxter T-Q relation and its generalizations arise as auxiliary linear problems for the Hirota equation.
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Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 116, No. 1, pp. 54–100, July, 1998.
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Zabrodin, A.V. Hirota equation and Bethe ansatz. Theor Math Phys 116, 782–819 (1998). https://doi.org/10.1007/BF02557123
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DOI: https://doi.org/10.1007/BF02557123