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Prog. Theor. Phys. Vol. 111 No. 3 (2004) pp. 371-386

[ Full Text PDF : FREE ACCESS (328K) ]

Four-Fermion Interaction Model in a Constant Magnetic Field at Finite Temperature and Chemical Potential

Tomohiro Inagaki,1,* Daiji Kimura2,** and Tsukasa Murata2,***

1Information Media Center, Hiroshima University, Higashi-Hiroshima 739-8521, Japan
2Department of Physics, Hiroshima University, Higashi-Hiroshima 739-8526, Japan

(Received November 29, 2003)

Abstract:

We investigate the influence of an external magnetic field on chiral symmetry breaking in a four-fermion interaction model at finite temperature and chemical potential. Using the Fock-Schwinger proper time method, we calculate the effective potential for the four-fermion interaction model to leading order in the 1/Nc expansion. The phase structure of the chiral symmetry breaking is determined in the T-µ, H-T and µ-H planes. The external magnetic field modifies the phase structure. It is found that a new phase appears for a large chemical potential.


URL : http://ptp.ipap.jp/link?PTP/111/371/
DOI : 10.1143/PTP.111.371


*inagaki@hiroshima-u.ac.jp
**kimura@theo.phys.sci.hiroshima-u.ac.jp
***murata@theo.phys.sci.hiroshima-u.ac.jp

[ Full Text PDF : FREE ACCESS (328K) ] Citation:

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Citing Article(s) :

  1. Progress of Theoretical Physics Vol. 117 No. 1 (2007) pp. 139-160 :
    Influence of QED Corrections on the Orientation of Chiral Symmetry Breaking in the NJL Model
    Takahiro Fujihara, Tomohiro Inagaki and Daiji Kimura

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