Perturbation Expansion for a Fermi Superfluid. II. Several Equilibrium Properties

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Abstract
The formalism of the preceding paper is applied to a system of uniform flow. Explicit expressions are obtained for the specific heat: C V , the superfluid-density tensor: ρ, and the spin susceptibility of the singlet pairing: χ. It is the quasiparticle excitation near the excitation threshold that is responsible for these quantities. The three expressions for v →0 reduce to the normal-state results of Luttinger; the Leggett expressions of ρ and χ are reproduced by neglecting the feedback effects.