Quantum mechanics of a generalised rigid body

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Sutherland, Dave 

We consider the quantum version of Arnold's generalisation of a rigid body in classical mechanics. Thus, we quantise the motion on an arbitrary Lie group manifold of a particle whose classical trajectories correspond to the geodesics of any one-sided-invariant metric. We show how the derivation of the spectrum of energy eigenstates can be simplified by making use of automorphisms of the Lie algebra and (for groups of Type I) by methods of harmonic analysis. We show how the method can be extended to cosets, generalising the linear rigid rotor. As examples, we consider all connected and simply-connected Lie groups up to dimension 3. This includes the universal cover of the archetypical rigid body, along with a number of new exactly-solvable models. We also discuss a possible application to the topical problem of quantising a perfect fluid.

hep-th, hep-th, hep-ph, math-ph, math.MP
Journal Title
Journal of Physics A: Mathematical and Theoretical
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IOP Publishing
Science and Technology Facilities Council (ST/K001728/1)
Science and Technology Facilities Council (ST/L000385/1)
We thank J. Davighi, J. Holgate, A. Lamacraft, C. Mouhot, M. Nardecchia, O. RandalWilliams, and R. Rattazzi for discussions. BG acknowledges the support of STFC (grant ST/L000385/1) and King’s College, Cambridge. DS also acknowledges the support of STFC, and Emmanuel College, Cambridge.