On the charged boson gas model as a theory of high Tc superconductivity
  We consider a hypothetical bound state of two electrons even if we leave the binding mechanism unknown. The bound electron pairs should behave as bosons and we conclude that the paired electrons are 'apparently' in the highest energy states of all the occupied states. We call this multi-particle state an 'apparent' Fermi surface. Then the solid in concern must be a type 2 superconductor for a charged boson fluid is theoretically known to be as such. Moreover the Bose-Einstein condensation is known to be closely related to the critical temperatures of high Tc superconductors, which is consistent with our model. Most notably the model may describe a superconductor either with or without a Fermi surface. We propose two experimental methods to detect a bound electron pair, low energy electron-electron scattering and photoemission from high Tc superconductors. 
Yanghyun Byun
cond-mat.supr-con