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We discuss three-dimensional $ \lambda\phi^4+\eta\phi^6 $ theory in thecontext of the 1/N expansion at finite temperature. We use the method of thecomposite operator (CJT) for summing a large sets of Feynman graphs. We analysethe behavior of the thermal square mass and the thermal coupling constant inthe low and high temperature limit. The existent of the tricritical point atsome temperature is found using this non-pertubative method.Comment: 15 pages, 2 eps figures, uses epsf.st

THE COMPOSITE OPERATOR (CJT) FORMALISM IN THE (λφ4 + ηφ6)D=3 MODEL AT FINITE TEMPERATURE

THE COMPOSITE OPERATOR (CJT) FORMALISM IN THE (λφ⁴ + ηφ⁶)_D=3 MODEL AT FINITE TEMPERATURE