Incompleteness of trajectory-based interpretations of quantum mechanics

Details Incompleteness of trajectory-based interpretations of quantum mechanics Incompleteness of trajectory-based interpretations of quantum mechanics

2004-06-09

arxiv.org/abs/quant-ph/0406054v2

J. Phys. A 37 (2004) 9549 (www.iop.org)

Physics

Quantum Physics

Latex, 13 pages, no figures, refs and clarifications added, to appear in J Phys A

Scientific paper

10.1088/0305-4470/37/40/015

Trajectory-based approaches to quantum mechanics include the de Broglie-Bohm interpretation and Nelson's stochastic interpretation. It is shown that the usual route to establishing the validity of such interpretations, via a decomposition of the Schroedinger equation into a continuity equation and a modified Hamilton-Jacobi equation, fails for some quantum states. A very simple example is provided by a quantum particle in a box, described by a wavefunction initially uniform over the interior of the box. For this example there is no corresponding continuity or modified Hamilton-Jacobi equation, and the spacetime dependence of the wavefunction has a known fractal structure. Examples with finite average energies are also constructed.

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