CONICET | Buscador de Institutos y Recursos Humanos

We apply a recent generalization of the fluid--dynamical scheme developed for two trapped fermion species with pairing interactions to examine the effects of coupling of low energy oscillations of particle and pair densities. The dynamical scheme satisfies Kohn´s theorem for both the particle density and the pairing gap. We analyze the form of the gap fluctuations in a spherical trap in terms of their multipolarity and the interaction strength, and find that coupling to the particle density produces considerable stiffness of the pairing oscillations, together with compression of the gap transition density towards the center of the trap.