Kapitza Conductance Across a Liquid-He3—Solid Interface: Equivalence of Boltzmann-Equation and Perturbation-Theory Approaches

Abstract

We show that if Fermi-liquid effects are neglected the perturbation calculation of Rice yields the same result as the Boltzmann-equation treatment of Bekarevich and Khalatnikov. By considering their limits of applicability the equivalence of the two approaches is established. There is, however, no a priori reason for neglecting Fermi-liquid effects which, through the existence of zero sound modes, are essential for understanding direct measurements of the acoustic impedance.