Four-Fermion Interaction Model on ${\mathcal{M}}^{D-1}\otimes S^1$

Abstract

Four-fermion interaction models are often used as simplified models of interacting fermion fields with the chiral symmetry. The chiral symmetry is dynamically broken for a larger four-fermion coupling. It is expected that the broken symmetry is restored under extreme conditions. In this paper, the finite size effect on the chiral symmetry breaking is investigated in the four-fermion interaction model. We consider the model on a flat spacetime with a compactified spatial coordinate, ${\mathcal{M}}^{D-1}\otimes S^1$ and obtain explicit expressions of the effective potential for arbitrary spacetime dimensions in the leading order of the $1/N$ expansion. Evaluating the effective potential, we show the critical lines which divide the symmetric and the broken phase and the sign-flip condition for the Casimir force.

arXiv comment22 pages, 13 figures

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• Charged pion condensation in dense quark matter: Nambu--Jona-Lasinio model study
• Casimir effect for lattice fermions
• Nambu-Jona Lasinio and Nonlinear Sigma Models in Condensed Matter Systems
• Precise Phase Structure in Four-fermion Interaction Model on Torus
• $D$ mesons as a probe of Casimir effect for chiral symmetry breaking