量子散射中格林函数对多种围道积分的选择

The Choice of Integration Contours for Green's Functions in the Quancum Scattering Theory

本文说明在量子散射理论中计算格林函数时,虽然对围道积分有多种选择方式,但由于数学条件和物理渐近边界条件的限制,只有一种围道积分是允许的。

In the paper, it is shown that for finding out the Green's functions in the theory of quantum scattering. The contours for the integration have a. great variety to choose from,but only one of them is permitted because of the limitation in physical and mathematical conditions.