Form invariance of the moment sum-rules for jellium with the addition of short-range terms in the pair-potential

TL;DR

This paper demonstrates that the first three even structure factor moments in a 3D classical jellium model remain invariant when short-range interactions are added to the Coulomb potential, providing insights into ionic-liquid behavior.

Contribution

It establishes the form invariance of the first three structure factor moments under addition of short-range terms in the pair-potential for classical jellium.

Findings

Moments are invariant with short-range additions.

Relevance to ionic-liquid criticality.

Extension of hierarchical equations.

Abstract

We find the first three (even) structure factor moments for a (non-quantum) one-component Jellium made of particles living in three dimensions and interacting with a Coulomb pair-potential plus a short-range term with either a finite range or decaying exponentially fast at large distances. Starting from the hierarchical Born-Green-Yvon equations we show that they are all form invariant respect to the addition of the short-range term. We discuss the relevance of the present study to interpret the failure of the moment sum-rules of ionic-liquids at criticality.