On a Poisson-Lie deformation of the BCn Sutherland system

Fehér, László Gyula and Görbe, Tamás Ferenc (2015) On a Poisson-Lie deformation of the BCn Sutherland system. NUCLEAR PHYSICS B, 901. pp. 85-114. ISSN 0550-3213

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Abstract

A deformation of the classical trigonometric BCn Sutherland system is derived via Hamiltonian reduction of the Heisenberg double of SU(2n). We apply a natural Poisson- Lie analogue of the Kazhdan-Kostant-Sternberg type reduction of the free particle on SU(2n) that leads to the BCn Sutherland system. We prove that this yields a Liouville integrable Hamiltonian system and construct a globally valid model of the smooth re- duced phase space wherein the commuting flows are complete. We point out that the reduced system, which contains 3 independent coupling constants besides the deforma- tion parameter, can be recovered (at least on a dense submanifold) as a singular limit of the standard 5-coupling deformation due to van Diejen. Our findings complement and further develop those obtained recently by Marshall on the hyperbolic case by reduction of the Heisenberg double of SU(n, n).

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