On the coupling of the holendash;particle and particlendash;particle (or holendash;hole) Greenrsquo;s functions

摘要

It is shown that a ladder vertex function can be related with an approximate particlendash;particle (or holendash;hole) Greenrsquo;s function in the same way as a screened potential is represented by a holendash;particle Greenrsquo;s function. Then, a screened potential and a ladder vertex function are constructed of solutions of the RPA and the PVA equation, respectivly, and using the rsquo;rsquo;staticrsquo;rsquo; forms of these, we propose the coupled scheme of the RPA and the PVA.