Abstract
We have studied the thermodynamics of the massive Gross-Neveu model with explicitly broken symmetry for finite temperature and fermion densities. The main purpose of the study is to serve as analytical orientation for the more complex problem of chiral transition in 4—dimensional QCD with quarks. For any non-vanishing fermion mass we find, at finite densities, lines of first order phase transitions. For small mass values traces of would-be second order transitions and a tricritical point are recognizable.
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