The often overlooked role of sound in liquid thermal transport

2026-10-23 · arXiv Quantum Physics

arXiv:2610.31127v1 Announce Type: cross

Abstract: Formulated a hundred years ago, the Bridgman formula for thermal conductivity of liquids postulates a proportionality between sound velocity and thermal conductivity. This designates phonons as heat carriers in a liquid. Its empirical success has been under-appreciated and its conceptual implications overlooked. It is not mentioned in well-known condensed-matter textbook. Here, we review its origin, its links to hydrodynamic Euler equations and to the fundamental paradox surrounding the parabolic heat equation and its fate across the quantum-classical crossover.

原文链接：https://arxiv.org/abs/2610.31127

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