title: Density and spin response of a strongly interacting Fermi gas in the attractive and quasirepulsive regime.
abstract: Recent experimental advances in ultracold Fermi gases allow for exploring response functions under different dynamical conditions. In particular, the issue of obtaining a "quasirepulsive" regime starting from a Fermi gas with an attractive interparticle interaction while avoiding the formation of the two-body bound state is currently debated. Here, we provide a calculation of the density and spin response for a wide range of temperature and coupling both in the attractive and quasirepulsive regime, whereby the system is assumed to evolve nonadiabatically toward the "upper branch" of the Fermi gas. A comparison is made with the available experimental data for these two quantities.
authors.affiliation: Physics Division, School of Science and Technology, University of Camerino, I-62032 Camerino (MC), Italy.
authors.forename: F
authors.initials: F
authors.lastname: Palestini
authors.forename: P
authors.initials: P
authors.lastname: Pieri
authors.forename: G C
authors.initials: GC
authors.lastname: Strinati