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    Path Integral for the Relativistic Particle and Harmonic Oscillators.T. Padmanabhan - 1994 - Foundations of Physics 24 (11):1543-1562.
    The action for a massive particle in special relativity can be expressed as the invariant proper length between the end points. In principle, one should be able to construct the quantum theory for such a system by the path integral approach using this action. On the other hand, it is well known that the dynamics of a free, relativistic, spinless massive particle is best described by a scalar field which is equivalent to an infinite number of harmonic oscillators. We clarify (...)
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