Quantum mechanics of a generalised rigid body. (1st April 2016)

• Record Type: Journal Article
• Authors: Gripaios, Ben; Sutherland, Dave
• Is Part Of: Journal of physics. Volume 49:Number 19(2016)
• Publication Date: 2016-04-01
• Subjects: harmonic analysis -- quantum mechanics -- Euler–Arnold rigid body; Mathematical physics -- Periodicals; Statistical physics -- Periodicals; Quantum theory -- Periodicals; Matter -- Properties -- Periodicals; 530.105
• DOI: 10.1088/1751-8113/49/19/195201
• Languages: English
• ISSNs: 1751-8113

Abstract

Abstract: 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.