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The formulation of quantum mechanics in terms of phase space functions-the third equation

D B Fairlie and C A Manogue

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The formalism of the Wigner distribution function is reviewed. In addition to the Liouville equation, which expresses the time rate of change of this function in terms of its Moyal bracket with the Hamiltonian, and its expression as a projection operator, a third equation is proposed with the aid of an auxiliary variable s, to which a formal solution is constructed in terms of known quantum-mechanical eigenfunctions and eigenvalues. In addition, an ab initio solution to the three equations in terms of an error function is found for the free particle in one dimension. Two views are advanced: the orthodox, that this new equation is merely a consistency requirement, and the speculative, that the measurement process has something to do with the choice of s.


PACS

03.65.Ca Formalism

03.65.Vf Phases: geometric; dynamic or topological

02.50.Ng Distribution theory and Monte Carlo studies

03.65.Ge Solutions of wave equations: bound states

02.30.Rz Integral equations

MSC

81S30 Phase space methods including Wigner distributions, etc.

81Q05 Closed and approximate solutions to the Schrödinger, Dirac, Klein-Gordon and other quantum-mechanical equations

Subjects

Mathematical physics

Computational physics

Quantum information and quantum mechanics

Dates

Issue 16 (21 August 1991)



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