A general formalism to determine the momentum density and Compton profiles of an inhomogeneous interacting electron system is proposed. The method is based on Feynman's theorem and the Hohenberg-Kohn theory of the inhomogeneous electron gas. Functional-derivative techniques are used. The results emcompass many of the previous approaches as special cases and present them from a unified vie~int. In addition, several new approximate methods for calculating the Compton profiles of electronic systems are proposed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.