Second viscosity of A1-phase of superfluid 3He at low temperatures

The second viscosity coefficients of A1-phase of superfluid 3He are calculated at low temperatures and melting pressure by using the standard Boltzmann equation approach. The Pfitzner procedure has been used for the quasiparticle scattering amplitude which appears in collision integrals of Boltzmann equation. Temperature dependence of components of second viscosity coefficients, (ζ1)xx(=(ζ1)yy)(ζ1)xx(=(ζ1)yy), (ζ1)zz(ζ1)zz and (ζ2)xx(=(ζ2)yy=(ζ2)zz)(ζ2)xx(=(ζ2)yy=(ζ2)zz) are proportional to ((s2)↑)2T6((s2)↑)2T6, ((s2)↑)2T4((s2)↑)2T4 and ((s2)↓)2T2((s2)↓)2T2, respectively, where the spin-dependent (s2)↓(s2)↓ is found to be constant with respect to temperature, while (s2)↑(s2)↑ has a 1/T2 dependence. Therefore, (ζ1)xx(ζ1)xx and (ζ2)xx(ζ2)xx are proportional to T2, and (ζ1)zz(ζ1)zz and the other viscosity coefficient ζ3ζ3 are constant.