Monday, June 4, 2012

1205.6902 (Jochen Keller et al.)

Response functions of cold neutron matter: density, spin and current fluctuations    [PDF]

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.
View original: http://arxiv.org/abs/1205.6902

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