On Sound Reflection in Superfluid

TL;DR

This paper investigates how sound waves in superfluid reflect off a wall, revealing complex reflection behaviors and sound conversion phenomena depending on the angle of incidence.

Contribution

It introduces a detailed analysis of sound reflection in superfluid, including angle-dependent reflection coefficients and prediction of sound conversion at slanted incidence.

Findings

Reflection coefficients depend nontrivially on incident angle

Sound conversion occurs at slanted incidence

Reflection behavior varies between first and second sound waves

Abstract

We consider reflection of the first and the second sound waves by a rigid flat wall in superfluid. Nontrivial dependence of the reflection coefficients on the angle of incidence is obtained. Sound conversion is predicted at slanted incidence.