Requests for technical support from the VASP group should be posted in the VASP-forum.

# Category:ACFDT

## Theory

RPA stands for the random phase approximation is often used as synonym for the adiabatic connection fluctuation dissipation theorem (ACFDT). RPA/ACFDT provides access to the correlation energy of a system and can be understood in terms of Feynman diagrams as an infinite sum of all bubble diagrams, where excitonic effects (interactions between electrons and holes) are neglected. The RPA/ACFDT is used as a post-processing tool to determine a more accurate groundstate energy.

The following page contains more information about the theory behind RPA/ACFDT:

## How to

A practical guide to ACFDT/RPA calculations can be found on following here.

## Pages in category "ACFDT"

The following 9 pages are in this category, out of 9 total.