BCS-BEC crossover in a relativistic superfluid and its significance to quark matter

Details BCS-BEC crossover in a relativistic superfluid and its significance to quark matter BCS-BEC crossover in a relativistic superfluid and its significance to quark matter

2005-04-12

arxiv.org/abs/hep-ph/0504083v3

Phys.Rev. D72 (2005) 096004

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 1 figure, revtex4; (v2) text has been clarified, references updated; (v3) final version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.72.096004

The character change of a superfluid state due to the variation of the attractive force is investigated in the relativistic framework with a massive fermion. Two crossovers are found. One is a crossover from the usual BCS state to the Bose-Einstein condensation (BEC) of bound fermion pairs. The other is from the BEC to the relativistic Bose-Einstein condensation (RBEC) of nearly massless bound pairs where antiparticles as well as particles dominate the thermodynamics. Possible realization of the BEC and RBEC states in the quark matter is also pointed out.

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