title: Derivation of hydrodynamics for the gapless mode in the BEC-BCS crossover from the exact one-loop effective action.
abstract: We derive generalized two-superfluid continuity equations for the BEC-BCS crossover in the presence of a Feshbach resonance at T=0. In addition, we calculate the velocity of sound throughout both BCS and Bose-Einstein condensation (BEC) regimes.
authors.affiliation: Department of Physics, National Dong Hwa University, Hua-Lien, Taiwan 974, Republic of China.
authors.forename: Da-Shin
authors.initials: DS
authors.lastname: Lee
authors.forename: Chi-Yong
authors.initials: CY
authors.lastname: Lin
authors.forename: Ray J
authors.initials: RJ
authors.lastname: Rivers