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Woit · 2025-10-20
已登记出处中的最早位置:§35.3 · zh-CN。
来源短摘录与定位
§35.3 · zh-CN · machine_draft · machine-draft-not-reviewed
使路径积分定义得更好的一种方法是在时间变量中进行解析延拓,正如在 12.5 节中对自由粒子情形所讨论的那样。在这种自由粒子情形中,在位置空间路径积分的定义中,用方程 12.8 代替方程 12.9 的使用,人们发现这导致路径上有一个定义良好的测度,即Wiener测度(Wiener measure)。更一般地,当势能非零时,可以使用维纳测度技术来定义路径积分,得到的结果最终需要解析延拓回物理时间变量。
§35.3 · en · machine_draft · machine-draft-not-reviewed
One method for making path integrals better defined is an analytic continuation in the time variable, as discussed in section 12.5 for the case of a free particle. In such a free particle case, replacing the use of equation 12.9 by equation 12.8 in the definition of the position space path integral, one finds that this leads to a well-defined measure on paths, Wiener measure. More generally, Wiener measure techniques can be used to define the path integral when the potential energy is non-zero, getting results that ultimately need to be analytically continued back to the physical time variable.