Possible crossover from BCS superconductivity to Bose-Einstein condensate in quark matter.

The possibility of the crossover from the BCS pairing to the Bose-Einstein condensate (BEC) of diquarks with going down in density is discussed in the framework of in the Nambu Jona-Lasinio (NJL) model. We find that the quark matter at moderate density may be close to the intermediate of the crossover, the precursory regime to the BEC phase. [ABSTRACT FROM AUTHOR]