Shear viscosity of the A_1-phase of superfluid 3He
M. A. Shahzamanian, R. Afzali
TL;DR
This paper calculates the shear viscosity of the A_1-phase of superfluid 3He near the transition temperature, incorporating quasiparticle scattering processes, and finds results consistent with experimental data.
Contribution
It provides an exact solution to the Boltzmann equation for shear viscosity in the A_1-phase, including quasiparticle scattering effects.
Findings
Shear viscosity drops as C_1(1-T/T_c_1)^(1/2) near T_c_1
Numerical factor C_1 agrees with experiments
Exact solution of Boltzmann equation for this system
Abstract
The scattering processes between the quasiparticles in spin- up superfluid with the quasiparticles in spin-down normal fluid are added to the other relevant scattering processes in the Boltzmann collision terms. The Boltzmann equation has been solved exactly for temperatures just below T_c_1. The shear viscosity component of the A_1- phase drops as C_1(1-T/T_c_1)^(1/2). The numerical factor C_1 is in fairly good agreement with the experiments.
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