Energy functional based on natural orbitals and occupancies for static properties of nuclei

TL;DR

This paper explores a new energy functional approach using natural orbitals and occupancies for nuclei, offering an alternative to traditional multi-reference methods, demonstrated through the Lipkin model.

Contribution

It introduces a novel energy functional based on natural orbitals and occupancies for nuclear systems, providing an alternative framework to existing multi-reference energy density functional methods.

Findings

Demonstrated the functional's application on the Lipkin model

Showed potential advantages over traditional methods

Provided insights into fermionic systems using natural orbitals

Abstract

The possibility to use functionals of occupation numbers and natural orbitals for interacting fermions is discussed as an alternative to multi-reference energy density functional method. An illustration based on the two-level Lipkin model is discussed.