Efrain J. Ferrer, Jason P. Keith
The graphical representation of the equation of state of a relativistic
fermion system with a four-fermion interaction in the strong coupling regime is
obtained as a function of the four-fermion coupling constant. It is shown, by
increasing the coupling constant strength, how the crossover from a
superconducting BCS regime to a Bose-Einstein-condensate (BEC) regime is
manifested in the nature of the quasiparticles' energy spectrum. It is found
that when the system has a distinguishable BEC nature its pressure becomes
negative. We discuss the implications for astrophysics of the unstable BEC
regime with associated negative pressure.
View original:
http://arxiv.org/abs/1201.2203
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