Critical Review of Path Integral Formulation

Details Critical Review of Path Integral Formulation Critical Review of Path Integral Formulation

2008-01-13

arxiv.org/abs/0801.1933v1

Physics

High Energy Physics

High Energy Physics - Theory

14 pages, no figure

Scientific paper

The path integral formulation in quantum mechanics corresponds to the first quantization since it is just to rewrite the quantum mechanical amplitude into many dimensional integrations over discretized coordinates $x_n$. However, the path integral expression cannot be connected to the dynamics of classical mechanics, even though, superficially, there is some similarity between them. Further, the field theory path integral in terms of many dimensional integrations over fields does not correspond to the field quantization. We clarify the essential difference between Feynman's original formulation of path integral in QED and the modern version of the path integral method prevailing in lattice field theory calculations, and show that the former can make a correct second quantization while the latter cannot quantize fields at all and its physical meaning is unknown.

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