We construct a two-parameter family of Backlund transformations for the trigonometric classical Gaudin magnet. The approach follows closely the one introduced by Sklyanin and Kuznetsov (1998 J. Phys. A: Math. Gen. 31 2241-51) in a number of seminal papers and takes advantage of the intimate relation between the trigonometric and the rational case. As in the paper by Hone, Kuznetsov and one of the authors (OR) (2001 J. Phys. A: Math. Gen. 34 2477-90) the Backlund transformations are presented as explicit symplectic maps, starting from their Lax representation. The (expected) connection with the xxz Heisenberg chain is established and the rational (xxx) case is recovered in a suitable limit. It is shown how to obtain a 'physical' transformation mapping real variables into real variables. The interpolating Hamiltonian flow is derived and some numerical iterations of the map are presented.

Ragnisco, O., Zullo, F. (2010). Backlund transformations as exact integrable time discretizations for the trigonometric Gaudin model. JOURNAL OF PHYSICS. A, MATHEMATICAL AND THEORETICAL, 43(434029) [10.1088/1751-8113/43/43/434029].

Backlund transformations as exact integrable time discretizations for the trigonometric Gaudin model

RAGNISCO, Orlando;
2010-01-01

Abstract

We construct a two-parameter family of Backlund transformations for the trigonometric classical Gaudin magnet. The approach follows closely the one introduced by Sklyanin and Kuznetsov (1998 J. Phys. A: Math. Gen. 31 2241-51) in a number of seminal papers and takes advantage of the intimate relation between the trigonometric and the rational case. As in the paper by Hone, Kuznetsov and one of the authors (OR) (2001 J. Phys. A: Math. Gen. 34 2477-90) the Backlund transformations are presented as explicit symplectic maps, starting from their Lax representation. The (expected) connection with the xxz Heisenberg chain is established and the rational (xxx) case is recovered in a suitable limit. It is shown how to obtain a 'physical' transformation mapping real variables into real variables. The interpolating Hamiltonian flow is derived and some numerical iterations of the map are presented.
2010
Ragnisco, O., Zullo, F. (2010). Backlund transformations as exact integrable time discretizations for the trigonometric Gaudin model. JOURNAL OF PHYSICS. A, MATHEMATICAL AND THEORETICAL, 43(434029) [10.1088/1751-8113/43/43/434029].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/119889
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