Transport coefficients of normal liquid helium-4 calculated by path integral centroid molecular dynamics simulation

Abstract

Thermal conductivity, shear viscosity, and bulk viscosity of normal liquid 4He at 1.7–4.0K are calculated using path integral centroid molecular dynamics (CMD) simulations. The calculated thermal conductivity and shear viscosity above lambda transition temperature are on the same order of magnitude as experimental values, while the agreement of shear viscosity is better. Above 2.3K the CMD well reproduces the temperature dependences of isochoric shear viscosity and of the time integral of the energy current and off-diagonal stress tensor correlation functions. The calculated bulk viscosity, not known in experiments, is several times larger than shear viscosity.