Spin response of a normal Fermi liquid with noncentral interactions

Details Spin response of a normal Fermi liquid with noncentral interactions Spin response of a normal Fermi liquid with noncentral interactions

2009-08-06

arxiv.org/abs/0908.0950v1

Physics

Nuclear Physics

Nuclear Theory

9 pages, 2 figures; NORDITA-2009-36

Scientific paper

We consider the spin response of a normal Fermi liquid with noncentral interactions under conditions intermediate between the collisionless and hydrodynamic regimes. This problem is of importance for calculations of neutrino properties in dense matter. By expressing the deviation of the quasiparticle distribution function from equilibrium in terms of eigenfunctions of the transport equation under the combined influence of collisions and an external field, we derive a closed expression for the spin-density--spin-density response function and compare its predictions with that of a relaxation time approximation. Our results indicate that the relaxation time approximation is reliable for neutrino properties under astrophysically relevant conditions.

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