Fermi-Liquid Transport Coefficients of Dilute Solutions ofHe3inHe4: An Addendum

Using recent exact solutions of the quasiparticle transport equation, we have reexamined the consistency between Bardeen, Baym, and Pines's phenomenological theory of dilute solutions of ${\mathrm{He}}^3$ in ${\mathrm{He}}^4$ and measurements of the spin-diffusion and thermal-conductivity coefficients of two solutions in the degenerate Fermi-liquid regime. Previously, Baym and the author had used lowest-order variational solutions for this purpose. Discrepancies of 10-15% persist which, beyond experimental uncertainty, must be attributed to oversimplification in treating the ${\mathrm{He}}^3$ scattering amplitudes as being independent of spin, velocity, and concentration.