title: Breached pairing superfluidity: possible realization in QCD.
abstract: We propose a wide universality class of gapless superfluids, and analyze a limit that might be realized in quark matter at intermediate densities. In the breached pairing color superconducting phase heavy s quarks, with a small Fermi surface, pair with light u or d quarks. The ground state has a superfluid and a normal Fermi component simultaneously. We expect a second-order phase transition, as a function of increasing density, from the breached pairing phase to the conventional color-flavor locked phase.
authors.affiliation: Center for Theoretical Physics, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Elena
authors.initials: E
authors.lastname: Gubankova
authors.forename: W Vincent
authors.initials: WV
authors.lastname: Liu
authors.forename: Frank
authors.initials: F
authors.lastname: Wilczek