Jochen Keller, Armen Sedrakian
We study the response of a single component pair-correlated baryonic Fermi-liquid to density, spin and their current perturbations. A complete set of response functions is derived in the low-temperature regime both within an effective theory based on a small momentum transfer expansion and within a numerical scheme valid for arbitrary momentum transfers. A comparison of these two approaches validates the perturbative approximation within the domain of its convergence. We derive the spectral functions of collective excitations associated with the density, density-current, spin, and spin-current perturbations. The dispersion relations and their damping in each case are obtained.
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http://arxiv.org/abs/1205.6902
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