Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2000-04-25
Physics
Nuclear Physics
Nuclear Theory
25 pages, 2 figures
Scientific paper
We study the competition between induced symmetry breaking (ISB), Cooper pairing (superconductivity) and chiral condensation at finite non-asymptotic density. Using a quantum mechanical model studied recently by Ilieva and Thirring, we analyze the expectation value of the fermion number density $\la a^*a\ra$ in the presence of chemical potential and discuss relevance of the ISB phenomenon in the model. By Bogoliubov transformation, we obtain the ground state energy and find that a phase with both superconducting and mean field gap is a true ground state. We also study the effective potentials of a two-dimensional field theory model for competitions between $\la\bar\psi\psi\ra$, $\la\psi\psi\ra$ and $\la\psi^\dagger\psi\ra$. We find that in the regime $\mu <\mu_c$, where $\mu_c$ is found to be around $0.4 m_F$ with $m_F$ being the renormalizaton point of chiral condensate, we have a chiral symmetry-breaking phase with almost zero fermion number density and in the case of $\mu >\mu_c$ the system sits in the mixed phase characterized by $\la \psi^\dagger\psi\ra\neq 0$ and $\la \psi\psi\ra\neq 0$ as long as the renormalization point, $M_0$, corresponding to a superconducting gap is not zero, $M_0\neq 0$.
Kim Youngman
Rho Mannque
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