# Onset of transverse (shear) waves in strongly-coupled Yukawa fluids

## TL;DR

This paper introduces a practical hydrodynamic approach to describe transverse shear waves in strongly-coupled Yukawa fluids, aligning well with numerical and experimental data across plasma and liquid metal systems.

## Contribution

The paper presents a simple, effective method to predict shear wave behavior in strongly-coupled Yukawa fluids, validated against numerical and experimental results.

## Key findings

- Dispersion curves match numerical data in the long-wavelength regime.
- Existence of a minimum wave number for shear wave propagation is confirmed.
- Experimental data from liquid metals support the approach.

## Abstract

A simple practical approach to describe transverse (shear) waves in strongly-coupled Yukawa fluids is presented. Theoretical dispersion curves, based on hydrodynamic consideration, are shown to compare favorably with existing numerical results for plasma-related systems in the long-wavelength regime. The existence of a minimum wave number below which shear waves cannot propagate and its magnitude are properly accounted in the approach. The relevance of the approach beyond plasma-related Yukawa fluids is demonstrated by using experimental data on transverse excitations in liquid metals Fe, Cu, and Zn, obtained from inelastic x-ray scattering. Some potentially important relations, scalings, and quasi-universalities are discussed. The results should be interesting for a broad community in chemical physics, materials physics, physics of fluids and glassy state, complex (dusty) plasmas, and soft matter.