Summary
The phase structure of the four-fermion model (1) under the action of an external chromomagnetic fieldH, temperatureT and a chemical potential Μ has been studied in three dimensions. It has been shown that: 1) the conditionsH ⊋ 0,T, Μ = 0 lead unavoidably to a spontaneous breakdown of the chiral invariance; 2) the chiral symmetry can be restored at sufficiently largeT or Μ values. The expressions for the critical temperature and quark mass in the range of large and small external field values have been derived.
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Klimenko, K.G., Magnitsky, B.V. & Vshivtsev, A.S. Three-dimensional\((\psi \overline \psi )^2 \) model with an external non-abelian field, temperature and a chemical potentialmodel with an external non-abelian field, temperature and a chemical potential. Nuov Cim A 107, 439–451 (1994). https://doi.org/10.1007/BF02831447
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DOI: https://doi.org/10.1007/BF02831447