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NJL Model at Finite Chemical Potential in a Constant Magnetic Field

Tomohiro Inagaki, Daiji Kimura, Tsukasa Murata

hep-pharXiv:hep-ph/0404219

Abstract

We investigate the influence of an external magnetic field on chiral symmetry breaking in the Nambu-Jona-Lasinio (NJL) model at finite temperature and chemical potential. According to the Fock-Schwinger proper-time method, we calculate the effective potential in the leading order of the 1/Nc expansion. The phase boundary dividing the symmetric phase and the broken phase is illustrated numerically. A complex behavior of the phase boundary is found for large chemical potential.

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