Foundations of Physics 32 (3):463-476 (2002)

We illustrate, using a simple model, that in the usual formulation the time-component of the Klein–Gordon current is not generally positive definite even if one restricts allowed solutions to those with positive frequencies. Since in de Broglie's theory of particle trajectories the particle follows the current this leads to difficulties of interpretation, with the appearance of trajectories which are closed loops in space-time and velocities not limited from above. We show that at least this pathology can be avoided if one adapts in a covariant form the formulation of relativistic point particle dynamics proposed by Gitman and Tyutin
Keywords pilot-wave theory: Klein–Gordon equation  space-time pathology
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DOI 10.1023/A:1014865430144
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