Comment on "Erratum: Collective modes and gapped momentum states in liquid Ga:Experiment, theory, and simulation"

TL;DR

This paper critiques a previous theoretical model for collective excitations in liquid gallium, demonstrating it neglects energy fluctuations and fails to match hydrodynamic behavior at long wavelengths.

Contribution

It provides a correction and clarification of the theoretical dispersion relation, emphasizing the importance of energy fluctuations in accurate modeling.

Findings

The original model omits energy fluctuations.

The corrected dispersion aligns with hydrodynamic limits.

Highlights the need for comprehensive fluctuation considerations.

Abstract

We show, that the theoretical expression for the dispersion of collective excitations reported in [Phys. Rev. B {\bf 103}, 099901 (2021)], at variance with what was claimed in the paper, does not account for the energy fluctuations and does not tend in the long-wavelegth limit to the correct hydrodynamic dispersion law.