Recently, two experiments, reported in Science[1, 2], have studied a polarized ultra-cold degenerate Fermi gas. This is a very new area that has attracted a great amount of interest from widely varying fields ranging from condensed matter physics, atomic molecular and optical physics, to particle and astro physics. As polarized Fermi gases have been demonstrated to be stable near the resonance,...

We discuss several pairing-related phenomena in nuclear systems, ranging from superfluidity in neutron stars to the gradual breaking of pairs in finite nuclei. We focus on the links between many-body pairing as it evolves from the underlying nucleon-nucleon interaction and the eventual experimental and theoretical manifestations of superfluidity in infinite nuclear matter and of pairing in fini...

We consider a model of bosons on a regular lattice with a kinetic energy due to hopping among sites and a potential energy due to strong on site interaction. A superfluid phase is expected when the ground state of the local energy is doubly degenerate. We consider a new scheme of simmetry breaking associated to the superfluid phase in which the order parameter is the statistical average of the ...