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Twisted spin Sutherland models from quantum Hamiltonian reduction

L Fehér1,2 and B G Pusztai3,4

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Recent general results on Hamiltonian reductions under polar group actions are applied to study some reductions of the free particle governed by the Laplace–Beltrami operator of a compact, connected, simple Lie group. The reduced systems associated with arbitrary finite-dimensional irreducible representations of the group by using the symmetry induced by twisted conjugations are described in detail. These systems generically yield integrable Sutherland-type many-body models with spin, which are called twisted spin Sutherland models if the underlying twisted conjugations are built on non-trivial Dynkin diagram automorphisms. The spectra of these models can be calculated, in principle, by solving certain Clebsch–Gordan problems, and the result is presented for the models associated with the symmetric tensorial powers of the defining representation of SU(N).


PACS

02.20.Qs General properties, structure, and representation of Lie groups

02.30.Ik Integrable systems

02.30.Tb Operator theory

02.10.Ud Linear algebra

03.65.-w Quantum mechanics

MSC

22C05 Compact groups

20C30 Representations of finite symmetric groups

70H33 Symmetries and conservation laws, reverse symmetries, invariant manifolds and their bifurcations, reduction

17B20 Simple, semisimple, reductive (super)algebras (roots)

17B40 Automorphisms, derivations, other operators

22Exx Lie groups (For the topology of Lie groups and homogeneous spaces, see 57Sxx, 57Txx; for analysis thereon, see 43A80, 43A85, 43A90)

Subjects

Mathematical physics

Quantum information and quantum mechanics

Dates

Issue 19 (16 May 2008)

Received 30 November 2007

Published 29 April 2008



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