Superconductivity as a Bose-Einstein condensation?
  Bose-Einstein condensation (BEC) in two dimensions (2D) (e.g., to describe the quasi-2D cuprates) is suggested as the possible mechanism widely believed to underlie superconductivity in general. A crucial role is played by nonzero center-of-mass momentum Cooper pairs (CPs) usually neglected in BCS theory. Also vital is the unique {\it linear} dispersion relation appropriate to weakly-coupled "bosonic" CPs moving in the Fermi sea--rather than in vacuum where the dispersion would be quadratic but only for very strong coupling, and for which BEC is known to be impossible in 2D. 
S.K. Adhikari, M. Casas, A. Puente, A. Rigo, M. Fortes, M.A. Sol\'is,   M. de Llano, A.A. Valladares, and O. Rojo