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arXiv 0801.1933hep-th
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路径积分公式的评述

Critical Review of Path Integral Formulation

Takehisa Fujita

摘要:

量子力学中的路径积分公式对应于第一量子化,因为它只是将量子力学振幅重写为离散坐标$x_n$上的多维积分。然而,路径积分表达式不能与经典力学的动力学联系起来,尽管表面上它们之间有一些相似之处。此外,场论的路径积分在多个领域的多维积分不对应于场量子化。本文阐明了Feynman最初的QED路径积分公式与格点场论计算中流行的现代形式的路径积分方法之间的本质区别,指出前者可以进行正确的二次量子化,而后者根本不能量子化场,其物理意义是未知的。

英文摘要:

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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