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 believ ed to underlie superconductivity in general. A crucial role is played by no nzero center-of-mass momentum Cooper pairs (CPs) usually neglected in BCS t heory. Also vital is the unique linear dispersion relation appropriate to w eakly-coupled "bosonic" CPs moving in the Fermi sea-rather than in vacuum w here the dispersion would be quadratic but only for very strong coupling, a nd for which BEC is known to be impossible in 2D.