Bypassing the malfunction junction in warm dense matter simulations

TL;DR

This paper introduces a finite-temperature potential functional theory as an efficient, in-principle-exact alternative to density functional theory molecular dynamics for simulating warm dense matter, reducing computational costs.

Contribution

The authors develop an orbital-free free energy approximation using a coupling-constant formalism, enabling more efficient simulations of warm dense matter.

Findings

The new method accurately models warm dense matter.

It significantly reduces computational costs compared to traditional methods.

The approach demonstrates high efficiency and theoretical rigor.

Abstract

Simulation of warm dense matter requires computational methods that capture both quantum and classical behavior efficiently under high-temperature, high-density conditions. Currently, density functional theory molecular dynamics is used to model electrons and ions, but this method's computational cost skyrockets as temperatures and densities increase. We propose finite-temperature potential functional theory as an in-principle-exact alternative that suffers no such drawback. We derive an orbital-free free energy approximation through a coupling-constant formalism. Our density approximation and its associated free energy approximation demonstrate the method's accuracy and efficiency.