Abstract
A study is made in the mean field approximation of the ground-state structure of the Gross-Neveu model as N /yields/ /infinity/ and the two-dimensional (1 + 1) /var phi//sup 4/ model with fermions at finite values of the temperature T and chemical potential /alpha/ of the fermions. The critical values T/sub c/ and /alpha//sub c/ at which the symmetry of the system, which is spontaneously broken at T = /alpha/ = 0, is restored are obtained. The possibility of using the obtained results to describe the physical property is of quasione-dimensional systems in the theory of condensed media is discussed.
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