Electromagnetic theory of sound and phonons in liquid

TL;DR

This paper develops an electromagnetic framework for understanding sound and phonons in dielectric liquids, treating ions and electrons as subsystems interacting via long-range electric fields, and relates this to metallic liquids.

Contribution

It introduces a novel electromagnetic theory of sound and phonons in dielectric liquids, extending the analogy with metallic liquids and considering electric field waves as sound modes.

Findings

Sound waves as mass density and velocity waves in ideal liquids

Electric potential waves as alternative sound modes

Introduction of phonons in both density and electric field contexts

Abstract

Sound waves in and dielectric liquid, that consists of subsystems of valency electrons with effective mass and ions which interact through the long-wave potential electric field are considered, on analogies with and metallic liquid, but with the requirement, that electric current is absent. It is shown that usual description of sound wave in an ideal liquid as wave of mass density and mass velocity follows from the offered consideration. It is also shown that sound waves with other side can be considered as waves of potential electric field in an environment. Introduction of phonons in both cases is considered.